* exp flags in flutter

* Fix test failures

* Roll engine to d470fc65ea1cb91ae66706b320d82c4536a4da8b

d470fc65e Roll src/third_party/skia 31972f889641..57263c2e0ccd (3 commits) (flutter/engine#7529)
4acfced38 Ensure the ResourceContext is not ripped out from under dart (flutter/engine#7528)
270e9a78a Roll src/third_party/skia a4e46804946c..31972f889641 (8 commits) (flutter/engine#7526)
e98437248 Roll src/third_party/skia 33b4b4908b7a..a4e46804946c (1 commits) (flutter/engine#7524)
4c135c298 Revert "Wrap the user entrypoint function in a zone with native exception callback. (flutter/engine#7512)" (flutter/engine#7522)
0a080a1e0 Roll src/third_party/dart 700254996f..da09945643 (14 commits) da09945643 Update dartfix pubspec before publishing b81c1b2095 Parse spread collections in map literals 1b0d93366d Add list literal spread collection fasta test cases 6c2ea4936a Clean up several deprecation hints 07f95e7761 Revert "[vm] Enable timeline on Fuchsia even in product mode." 9cdce03e16 [dart2js] Improve null receiver guard removal near JS code c3599a9d8c Revert "[vm, isolate] Fix length truncation in message snapshots." 95e10c336f Revert "[vm] Assert callback state for all Dart_Set*ReturnValue." 3f7b371f2c [vm] Enable timeline on Fuchsia even in product mode. 4b22195ea1 [vm, isolate] Fix length truncation in message snapshots. a353b1172a [vm, compiler] Remove TAG_IC_DATA, which has since been subsumed by RebindRule. ca12afec50 [vm] Assert callback state for all Dart_Set*ReturnValue. 2028006a25 [Observatory] Updated Dart icon to new colour scheme 84273b9f36 Improvements for flow analysis.
fff537777 Roll src/third_party/skia 25b9f192ed8c..33b4b4908b7a (1 commits) (flutter/engine#7520)
a58cc3960 Roll src/third_party/skia 1ce80fb351a2..25b9f192ed8c (5 commits) (flutter/engine#7517)
52e0e9da5 Roll src/third_party/skia 081e6f375497..1ce80fb351a2 (12 commits) (flutter/engine#7514)
25559ed07 Wrap the user entrypoint function in a zone with native exception callback. (flutter/engine#7512)
1b0d09b21 Roll src/third_party/dart f701e11756..700254996f (5 commits) 700254996f [ Observatory / Dartium ] Updated observatory documentation and tests to remove references to Dartium. 78abb98ee7 [vm/bytecode] Fix AST removal for package-split kernel files with bytecode 0075b58bb8 CHANGELOG entry for DEPRECATED_MEMBER_USE split a5f102a7d1 Analyzer: first pass at reporting unchecked nullable value usage. a10ddca1b1 [ VM / Service ] Allow for `profile_period` flag to be set via the service protocol
e7ade51da Remove unused headers (flutter/engine#7511)
369b4db35 Roll src/third_party/skia 1374c85fbf53..081e6f375497 (6 commits) (flutter/engine#7510)
366d44e11 Roll src/third_party/dart 9b5eabdaca..f701e11756 (10 commits) f701e11756 [ VM / Debugger ] Fix issue where a 'Step' command issued when there's no stack caused a crash. c5bfccc6fb Make downloading the LSP spec a flag and commit the version parsed locally dbeec3bbf3 Fix formatting in generated LSP file header bfe15d87d8 Fix LSP exceptions serializing ResponseErrors with Uris 7984dc4fcc Prepare to publish analyzer version 0.34.2. 4b1b2f9176 Switch LSP formatter to not fetch resolved ASTs that aren't used 5ce5d697da Implement LSP code folding b47524d5b0 Ensure all unhandled exceptions are recorded on the server 8ba2de2344 Sort context for conflicting inherited members 215f6620e7 [Kernel] Signal errors on static fields in constant contexts

This is based on https://github.com/flutter/flutter/commit/9880baa3964789674ad265e18cbc448ec23e0b76
but will support building APKs with --local-engine

The code coverage for the repository seems to be ~85% while the coverage reported by the Coveralls badge is 100%.

* Fix Podfile issue #24342

Sometimes base configurations  (config.base_configuration_reference) can be nil, which leads to undefined method `real_path' for nil:NilClass.

* Disable bitcode in every case

* [FAB] Adding FAB as class in tests.

* [Material] FAB theme tests corrected. Also deeper into Material for elevation testing.

* [Material] Comment clarification.

* [Material] TODO formatting.

* [Material] Formatting.

* [Material] Comment correction.

* [Material] Updated values.

* [Material] Removing comment, low-level check, and adding safety.

* Add more animation tests for rotation

* Test animation progress

* Progress on the tests

* Everything 'works'

* We don't need to guarantee the rotation of the fab as it exits.

* Remove print statement

* Cleanup extra lines

* Remove whitespace

Introduced by merging an old PR (https://github.com/flutter/flutter/pull/21157).

Fixes #20893, the most-upvoted bug for framework.

A detailed analysis explaining the cause of the bug has been posted at #20893 (comment).

* Register hot restart service in flutter_tools.

This will help track down any that aren't cleaning up and also may help track down leaked flutter_tester processes (https://github.com/dart-lang/sdk/issues/35549).

https://github.com/flutter/engine/compare/3c0aa918de87...25559ed07796

git log 3c0aa918de8782ed73b12fc148c4ab7cb6ed1416..25559ed0779604d56c47c5d2341ffd16b137cd10 --no-merges --oneline
25559ed07 Wrap the user entrypoint function in a zone with native exception callback. (flutter/engine#7512)
1b0d09b21 Roll src/third_party/dart f701e11756..700254996f (5 commits) 700254996f [ Observatory / Dartium ] Updated observatory documentation and tests to remove references to Dartium. 78abb98ee7 [vm/bytecode] Fix AST removal for package-split kernel files with bytecode 0075b58bb8 CHANGELOG entry for DEPRECATED_MEMBER_USE split a5f102a7d1 Analyzer: first pass at reporting unchecked nullable value usage. a10ddca1b1 [ VM / Service ] Allow for `profile_period` flag to be set via the service protocol
e7ade51da Remove unused headers (flutter/engine#7511)
369b4db35 Roll src/third_party/skia 1374c85fbf53..081e6f375497 (6 commits) (flutter/engine#7510)
366d44e11 Roll src/third_party/dart 9b5eabdaca..f701e11756 (10 commits) f701e11756 [ VM / Debugger ] Fix issue where a 'Step' command issued when there's no stack caused a crash. c5bfccc6fb Make downloading the LSP spec a flag and commit the version parsed locally dbeec3bbf3 Fix formatting in generated LSP file header bfe15d87d8 Fix LSP exceptions serializing ResponseErrors with Uris 7984dc4fcc Prepare to publish analyzer version 0.34.2. 4b1b2f9176 Switch LSP formatter to not fetch resolved ASTs that aren't used 5ce5d697da Implement LSP code folding b47524d5b0 Ensure all unhandled exceptions are recorded on the server 8ba2de2344 Sort context for conflicting inherited members 215f6620e7 [Kernel] Signal errors on static fields in constant contexts
1e93a8eb3 Deprecate FlutterProjectArgs.main_path, packages_path (flutter/engine#7497)
b058920ca Edit the bundleid so that it conform to UIT specifications. (flutter/engine#7503)
32c9ae616 Roll src/third_party/skia 2c379d8e27e6..1374c85fbf53 (4 commits) (flutter/engine#7508)
96d10b184 Roll src/third_party/dart 492df72739..9b5eabdaca (8 commits) 9b5eabdaca Fix crash in color support a533753bec Remove --fast-startup flag support from testing scripts and status files 5f10aed19c [Kernel] Don't print static fields in instance constants bdb51e2837 Improve input path handling and remove extra schemas. 0604110806 Reduce expectations on thrown exception 966e007b63 Pass CallStructure on dynamic and static use in ResolutionWorldBuilder 3e7801294e Remove unneeded code in OrderedTypeSet 8a91948c03 [Kernel] Properly signal compilation errors for constants
770984088 Roll src/third_party/skia a8694cc150a1..2c379d8e27e6 (1 commits) (flutter/engine#7506)
046ddc68d Roll src/third_party/skia 47b7cd9a6baf..a8694cc150a1 (1 commits) (flutter/engine#7504)

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 (bmparr@google.com), and stop
the roller if necessary.

* Fixes Android keyboard bug

This reverts commit d8db70af.

* move flutter_assets to App.framework

* remove flutter_assets references from all pbxproj files checked in

Newer NDKs switched to clang which by default uses system linker, instead
we need to force it to use appropriate toolchain linker by passing
-fuse-ld= command line flag.

Fixes #23458

This reverts commit 9880baa3.

Reason for revert: broke `--local-engine` command line option.

Generally, we should always use default-less switches for
platform-specific behaviour so we're forced to make a conscious decision
on each instance of such behaviour any time we add support for a new
platform.

* Add labelStyle + unselectedLabelStyle to TabBarTheme