Xcode 10 introduces a new build system which includes stricter checks on
duplicate build outputs.

When plugins are in use, there are two competing build actions that copy
Flutter.framework into the build application Frameworks directory:

  1. The Embed Frameworks build phase for the Runner project
  2. The [CP] Embed Pods Frameworks build phase that pod install creates
     in the project.

Item (1) is there to ensure the framework is copied into the built app
in the case where there are no plugins (and therefore no CocoaPods
integration in the Xcode project). Item (2) is there because Flutter's
podspec declares Flutter.framework as a vended_framework, and CocoaPods
automatically adds a copy step for each such vended_framework in the
transitive closure of CocoaPods dependencies.

As an immediate fix, we opt back into the build system used by Xcode 9
and earlier. Longer term, we need to update our templates and
flutter_tools to correctly handle this situation.

See: https://github.com/flutter/flutter/issues/20685

This should fix #18889 which may be related to `adb logcat` not working correctly in non-terminals on some LG devices. See https://github.com/flutter/flutter/issues/18889#issuecomment-422217761.

Add back screenshot extension that was temporarily disabled.

Add matchesReferenceImage matcher to test that the screenshot extension
generates equivalent images to InspectorService.instance.screenshot.

https://github.com/flutter/engine/compare/dcbc8a820733...9e315e64659e

git log dcbc8a820733..9e315e64659e --no-merges --oneline
9e315e646 Remove entries from dart_vm_entry_points.txt and use annotations (flutter/engine#6226)
cdbe21466 Update test .gitignore (flutter/engine#6272)
dbfa8276d [fuchsia] Fixes for the Fuchsia build (flutter/engine#6273)


The AutoRoll server is located here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, please contact the current sheriff, who should
be CC'd on the roll, and stop the roller if necessary.

This caused issues for projects without an Xcode workspace. Almost all
Flutter projects in the wild will have a workspace, but this patch needs
to add a check to catch any that lack one.

This reverts commit 021f472e.

Xcode 10 introduces a new build system which includes stricter checks on
duplicate build outputs.

When plugins are in use, there are two competing build actions that copy
Flutter.framework into the build application Frameworks directory:

  1. The Embed Frameworks build phase for the Runner project
  2. The [CP] Embed Pods Frameworks build phase that pod install creates
     in the project.

Item (1) is there to ensure the framework is copied into the built app
in the case where there are no plugins (and therefore no CocoaPods
integration in the Xcode project). Item (2) is there because Flutter's
podspec declares Flutter.framework as a vended_framework, and CocoaPods
automatically adds a copy step for each such vended_framework in the
transitive closure of CocoaPods dependencies.

As an immediate fix, we opt back into the build system used by Xcode 9
and earlier. Longer term, we need to update our templates and
flutter_tools to correctly handle this situation.

See: https://github.com/flutter/flutter/issues/20685

These tests don't seem particularly more flaky than ony others any more.

https://github.com/flutter/engine/compare/1b2a2075a936...b0b19d6ce1d2

git log 1b2a2075a936..b0b19d6ce1d2 --no-merges --oneline
b0b19d6ce Fix the frontend_server test (flutter/engine#6261)


The AutoRoll server is located here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, please contact the current sheriff, who should
be CC'd on the roll, and stop the roller if necessary.

https://github.com/flutter/engine/compare/72665c6827a5...1b2a2075a936

git log 72665c6827a5..1b2a2075a936 --no-merges --oneline
1b2a2075a Update engine tests for Dart 2 compilation and language changes (flutter/engine#6262)
83b0e299a Roll src/third_party/skia 098c1355bf70..060e992ef5b8 (1 commits) (flutter/engine#6269)


The AutoRoll server is located here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, please contact the current sheriff, who should
be CC'd on the roll, and stop the roller if necessary.

Fixes https://github.com/flutter/flutter/issues/21445

https://github.com/flutter/engine/compare/b43b3e87022b...72665c6827a5

git log b43b3e87022b..72665c6827a5 --no-merges --oneline
72665c682 Roll src/third_party/skia 840debe9c748..098c1355bf70 (1 commits) (flutter/engine#6268)
d212e84b7 Roll src/third_party/skia 8e73f4b6bbef..840debe9c748 (1 commits) (flutter/engine#6267)
aaef8ebdf Roll src/third_party/skia afebe1614e5e..8e73f4b6bbef (1 commits) (flutter/engine#6265)
45696e72f Roll src/third_party/skia 7b617a7fc85d..afebe1614e5e (8 commits) (flutter/engine#6258)


The AutoRoll server is located here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, please contact the current sheriff, who should
be CC'd on the roll, and stop the roller if necessary.

https://github.com/flutter/engine/compare/24d94601b906...b43b3e87022b

git log 24d94601b906..b43b3e87022b --no-merges --oneline
b43b3e870 Remove LayerBuilder and DefaultLayerBuilder (flutter/engine#6256)
e817f2d98 Roll src/third_party/skia 7724d3f4949b..7b617a7fc85d (6 commits) (flutter/engine#6255)
a0dff815e Update test and license scripts for Dart SDK 2.1.0 (flutter/engine#6254)

The AutoRoll server is located here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, please contact the current sheriff, who should
be CC'd on the roll, and stop the roller if necessary.

Is it possible to add a unit test to make sure that all links in our
Dart doc are valid?

See https://github.com/flutter/flutter/pull/19121#issuecomment-419520765

https://github.com/flutter/engine/compare/7a9b430d740b...60bb5da33c72

git log 7a9b430d740b..60bb5da33c72 --no-merges --oneline
60bb5da33 Reapply "Some cleanups enabled by removing support for Dart 1" (flutter/engine#6250)
272be27f7 update live region to trigger on label change, remove manual trigger (flutter/engine#6248)


The AutoRoll server is located here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, please contact the current sheriff, who should
be CC'd on the roll, and stop the roller if necessary.

https://github.com/flutter/engine/compare/ade2d1d04cca...7a9b430d740b

git log ade2d1d04cca..7a9b430d740b --no-merges --oneline
7a9b430d7 Roll src/third_party/skia 66261f1ac2b7..7724d3f4949b (3 commits) (flutter/engine#6252)


The AutoRoll server is located here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, please contact the current sheriff, who should
be CC'd on the roll, and stop the roller if necessary.

https://github.com/flutter/engine/compare/f3ef31aa8c2c...ade2d1d04cca

git log f3ef31aa8c2c..ade2d1d04cca --no-merges --oneline
ade2d1d04 Roll src/third_party/skia 637c06aec7b1..66261f1ac2b7 (29 commits) (flutter/engine#6251)


The AutoRoll server is located here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, please contact the current sheriff, who should
be CC'd on the roll, and stop the roller if necessary.

https://github.com/flutter/engine/compare/931d3cbbc250...f3ef31aa8c2c

git log 931d3cbbc250..f3ef31aa8c2c --no-merges --oneline
f3ef31aa8 Roll src/third_party/skia 46a5f6c28a34..637c06aec7b1 (1 commits) (flutter/engine#6246)


The AutoRoll server is located here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll

Documentation for the AutoRoller is here:
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If the roll is causing failures, please contact the current sheriff, who should
be CC'd on the roll, and stop the roller if necessary.

931d3cbbc Roll Dart to version c28db2d6e17f046f95db5987394df43c95d58468

abd918eb6 (upstream/master) Add scrollIndex and scrollChildren to semantics, add Android implementation (#6239)
23fcc2771 Prepare for stripping and dsyming Flutter.framework (#6247)

This is a blocker for Google roll since we are not at dev4.0:
- Future is not yet part of dart:core.
- Future.sync().then<dynamic>... causes failure without the new keyword.

In my local tests, this should finally fix https://github.com/flutter/flutter/issues/21617

* Don't sync first full kernel file.

* Update the comment

https://github.com/flutter/engine/compare/12315736f9ca...c0e6f6a6e665

git log 12315736f9ca..c0e6f6a6e665 --no-merges --oneline
c0e6f6a6e Roll src/third_party/skia 76bba35cbaa4..46a5f6c28a34 (1 commits) (flutter/engine#6244)
49ef4adad Fix a crash when UILaunchStoryboardName is not specified in Info.plist (flutter/engine#6234)
2a433bc68 Roll src/third_party/skia 34e5e1b387f5..76bba35cbaa4 (2 commits) (flutter/engine#6243)
0c28a093a Roll src/third_party/skia 858f648bdae3..34e5e1b387f5 (8 commits) (flutter/engine#6241)
513f8fbae Roll src/third_party/skia 16322637c477..858f648bdae3 (7 commits) (flutter/engine#6240)
9a7d7215a Roll src/third_party/skia 44215505623b..16322637c477 (10 commits) (flutter/engine#6238)

The AutoRoll server is located here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, please contact the current sheriff, who should
be CC'd on the roll, and stop the roller if necessary.

Previously, the engine did not properly pass the AA flag on ClipRect.clipBehavior. flutter/engine#6199 fixes this and enables AA. However, default AA on clipRects has caused severe regressions in benchmark performance.

To maintain expected performance, we should now default the clipBehavior to hardEdge to disable default AA. This is consistent with any flutter projects that did not previously explicitly set the clipBehavior and should not change app appearance.

Underlying issue with breakpoint was that /var path is a symlink to a /private/var on mac. Because of that breakpoint could not be resolved.