This change creates an `AppBarTheme` to be used with `AppBar` widgets. This allows for users to theme their AppBars separately from their overall Theme if they choose.

* Avoid calling cancel more than once

* add some missing checks for ansispinner

* move flutter_assets to App.framework

* Roll engine to 05fee4eeee0ff6b219b1fcc394371e5f6963cc46

05fee4eee Update default flutter_assets path for iOS embedding (flutter/engine#7518)
02205db01 Roll src/third_party/skia 5d052dac3ac1..02738a86e5fd (4 commits) (flutter/engine#7541)
af907c074 Roll src/third_party/skia 5c7a3ac0e214..5d052dac3ac1 (7 commits) (flutter/engine#7540)
dde286673 IWYU to get SkFontMetrics (flutter/engine#7539)

5a8b0f3db When the instance method:init is unavailable, mark the class method:new unavailable. (flutter/engine#7532) (#26827)


https://github.com/flutter/engine/compare/898b4f8da4ef...5a8b0f3dba6a

git log 898b4f8da4efd905934d35cfc808932c80b26df0..5a8b0f3dba6a8627a90398f57511f8085b94fb61 --no-merges --oneline
5a8b0f3db When the instance method:init is unavailable, mark the class method:new unavailable. (flutter/engine#7532)

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.

These are essentially self-inflicted race conditions. Instead of timeouts we're going to try a more verbose logging mechanism that points out when things are taking a long time.

* d470fc65e Roll src/third_party/skia 31972f889641..57263c2e0ccd (3 commits) (flutter/engine#7529)

* 11aa5e628 Roll src/third_party/dart da09945643..ac1bf656c4 (22 commits) (flutter/engine#7527)

* a0b4d6b61 Configure the embedder in AOT in "profile" and "release" runtime modes. (flutter/engine#7533)

* 2cf1181e5 Roll src/third_party/dart ac1bf656c4..2e5453ddb4 (42 commits) 2e5453ddb4 [ VM ] Updated licenses to match other licenses in project 3d71abcada Prepare to publish a new version of the analyzer_plugin package with an updated dependency on analyzer ebf319b64b Clean up some lingering references to type propogation be47aad327 [VM/Compiler/AOT] Bare instructions 9: Improve write barrier on ARM/ARM64/X64 10f63f806d [gardening] Mark io/stdout_stderr_non_blocking_test flaky on x64 8b214f4d72 Restore type parser from reify project 65dde13f1b Don't check formatting of Front-End test cases 53217e6eb1 [kernel] Add ability to (de)serialize DirectMethodInvocation 5048889c54 [kernel] Add ability to (de)serialize StaticInvocation 7ea2dfad20 [kernel] Add ability to (de)serialize DirectPropertySet 50c06c55ba [kernel] Add ability to (de)serialize DirectPropertyGet 793fbc0d4a [kernel] Add ability to (de)serialize StaticSet 581af6eb56 [co19] DEPS and status file updated b0017d758c Refer to correct locations in SDK (and other dill files) da6938a5b2 After some more `git cl uploads`, this fixes a bunch of little problems in the spec that we have noted over time. c9a55b437a [Kernel] Remove the dedicated fromEnvironment constants 1a0367a373 Create test which demonstrates issues 35558 and 35559 6205d7e82c [kernel] Add ability to (de)serialize StaticGet e529988474 [kernel] Rename ScopedReference to ScopedUse f437fa02c2 [kernel] Nest *Environment into *State for (de)serialization 0dea413d94 Tests for reachability, fix for try/finally. e3302cdb8f Follow-up to storing problems in the ast dd04c374b8 [vm,dart:io] On Linux, Android, and Fuchsia the getsockopt parameter is incorrect. e64428a839 Revert "[vm] Cleanup Dart_Get/Set/HasStickyError API and use isolate's sticky error only as a backup for thread's sticky error" 324718fadd [vm] Revert "Restore TLABs." 5a607755b2 [ VM / dart:io ] Fixed issue where writing to a socket after it has been closed would raise SIGPIPE and crash the process. 6b5e8603d5 Reland "[vm/compiler] AOT inline heuristics improvements" 06a1e6e9e3 [vm] Enable timeline on Fuchsia even in product mode. 2faab1d4c0 Update AstBuilder to build spread collection AST structures b10f179608 [vm] Cleanup Dart_Get/Set/HasStickyError API and use isolate's sticky error only as a backup for thread's sticky error 5b1daaac6c Exposes a thin layer over getsockopt/setsockopt for supported platforms. c701e76506 [vm/compiler] handle non-nullable null situation better b692a6d183 Improvements for flow analysis. fc62cf0373 [infra] Fix co19 git URL in DEPS e7bd3edc9f [vm] Assert callback state for all Dart_Set*ReturnValue, take 2. ddce2824fa Add more spread collection fasta test cases 6639cbd6c3 Add AstBuilder spread-collections and control-flow-collections flags 1020a22290 [dart2js] Do more native method inlining f353719b08 Ignore unnecessary_cast hint. 3513f872ce Extract DartFileEditBuilder.importLibrary() into separate file. 46080dd886 Update DEPS to check out co19 tests from dart.googlesource.com ca2db2ad53 [VM/Compiler/AOT] Bare instructions 8: Improve AOT code by using pc-relative calls

* d5d6bd2c5 Fix suspicious typo "painted" to "paint" (flutter/engine#7530)

* d89f3b059 Roll src/third_party/skia 57263c2e0ccd..5c7a3ac0e214 (15 commits) (flutter/engine#7536)

* 75cfebde0 Roll buildroot and update method of getting android SDK and support libs (flutter/engine#7284)

* 898b4f8da Allow embedders to specify AOT snapshot buffers. (flutter/engine#7538)

Make sure we get latest build tools/platform for Windows.  It wasn't previously failing, but now is.  Similar changes made to Linux/Mac recently.

Fix mistaken file extension inclusion

Will land TBR @mklim or @Hixie

* Rev Android Platform to 28 for bots

* push all to 28

* include platform tools update

There's no reason to disallow this as TextStyle can handle lerping between null parameters just fine. This change also adds tests to ensure the correct behavior

* 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).