* Fix image provider missing early return

* test

* comments

* whitespace, another comment

https://github.com/flutter/engine/compare/6b8c150639b5...e625e174c5df

git log 6b8c150639b5..e625e174c5df --first-parent --oneline
2020-01-31 skia-flutter-autoroll@skia.org Roll src/third_party/dart 162d6c5634a0..5ae5aff6406a (28 commits) (flutter/engine#16303)
2020-01-31 skia-flutter-autoroll@skia.org Roll src/third_party/skia 6305b2f8342a..0ee16f689843 (2 commits) (flutter/engine#16286)
2020-01-31 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/mac-amd64 from yissX... to x6sVj... (flutter/engine#16288)


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https://github.com/flutter/engine/compare/804dca62a17c...6b8c150639b5

git log 804dca62a17c..6b8c150639b5 --first-parent --oneline
2020-01-31 gw280@google.com Use static constexpr for iphone_xs_times (flutter/engine#16264)
2020-01-31 30870216+gaaclarke@users.noreply.github.com Started coalescing updates to viewport metrics after foregrounding the app. (flutter/engine#16270)
2020-01-31 chinmaygarde@google.com Remove superfluous INFO logs from //flutter/runtime. (flutter/engine#16280)


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* reland "Refactors global key duplication detection (#46183)"

This reverts commit d2b66dbf.

* fix test

This reverts commit 46ccd086.

https://github.com/flutter/engine/compare/74d07b5f6b4f...804dca62a17c

git log 74d07b5f6b4f..804dca62a17c --first-parent --oneline
2020-01-31 yjbanov@google.com Use bundled Roboto in all tests (flutter/engine#16218)
2020-01-31 gw280@google.com Revert "Migrate flutter_runner from flutter_runner::{Thread,Loop} to fml::{Thread,MessageLoop} (#15118)" (flutter/engine#16277)
2020-01-31 skia-flutter-autoroll@skia.org Roll src/third_party/skia 36c0521d57de..6305b2f8342a (8 commits) (flutter/engine#16272)
2020-01-31 jason-simmons@users.noreply.github.com Revert "[web] Correct getPositionForOffset for multi-line paragraphs (#16206)" (flutter/engine#16268)
2020-01-30 stuartmorgan@google.com Fix Windows file checks of unicode paths (flutter/engine#16105)
2020-01-30 iska.kaushik@gmail.com [fuchsia] Fix the import for dart_api.h (flutter/engine#16269)
2020-01-30 iska.kaushik@gmail.com [fuchsia] SceneHostBindings are no longer thread locals (flutter/engine#16262)
2020-01-30 gw280@google.com Pass through invoker.resources in fuchsia_test_archive (flutter/engine#16265)
2020-01-30 matthew-carroll@users.noreply.github.com Notify PlatformViewsController within FlutterEngine when a hot restart occurs. (#48518) (flutter/engine#16230)
2020-01-30 skia-flutter-autoroll@skia.org Roll src/third_party/dart fc3af737c759..162d6c5634a0 (209 commits) (flutter/engine#16261)
2020-01-30 skia-flutter-autoroll@skia.org Roll src/third_party/skia d1be5d64f8a7..36c0521d57de (13 commits) (flutter/engine#16260)
2020-01-30 mouad.debbar@gmail.com [web] Correct getPositionForOffset for multi-line paragraphs (flutter/engine#16206)
2020-01-30 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/linux-amd64 from -mGIA... to 93K0d... (flutter/engine#16257)


If this roll has caused a breakage, revert this CL and stop the roller
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This reverts commit 25f798a1.

https://github.com/flutter/engine/compare/74d07b5f6b4f...e5209202fb00

git log 74d07b5f6b4f..e5209202fb00 --first-parent --oneline
2020-01-30 skia-flutter-autoroll@skia.org Roll src/third_party/dart fc3af737c759..162d6c5634a0 (209 commits) (flutter/engine#16261)
2020-01-30 skia-flutter-autoroll@skia.org Roll src/third_party/skia d1be5d64f8a7..36c0521d57de (13 commits) (flutter/engine#16260)
2020-01-30 mouad.debbar@gmail.com [web] Correct getPositionForOffset for multi-line paragraphs (flutter/engine#16206)
2020-01-30 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/linux-amd64 from -mGIA... to 93K0d... (flutter/engine#16257)


If this roll has caused a breakage, revert this CL and stop the roller
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This reverts commit 340b193f.

Initial web benchmark harness and 3 benchmarks

This PR fixes #49647 by changing DiagnosticableMixin.toDiagnosticsNode and other things to accept DiagnosticableMixin instead of requiring Diagnosticable.

This reverts commit 9d4a35ba because it appears to break

the gradle_non_android_plugin_test.

The test hangs on iOS 13 device, see https://github.com/flutter/flutter/issues/49635.

Now that the new schema is supported on the stable channel, and the old
schema is considered legacy, the template should always create plugins
using the new schema.

https://github.com/flutter/engine/compare/f6526c0cf8a3...74d07b5f6b4f

git log f6526c0cf8a3..74d07b5f6b4f --first-parent --oneline
2020-01-30 skia-flutter-autoroll@skia.org Roll src/third_party/skia 8f44c3504ca6..d1be5d64f8a7 (4 commits) (flutter/engine#16251)
2020-01-30 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/mac-amd64 from MK0YU... to yissX... (flutter/engine#16250)


If this roll has caused a breakage, revert this CL and stop the roller
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To report a problem with the AutoRoller itself, please file a bug:
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Fixes #46150 by catching both the delete and backspace keys, rather than just the delete key.

Fixes the focus handling when popping pages so that when multiple pages are popped, the focus doesn't try to focus the interstitial pages.