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This API is being removed from the Dart SDK.

* Add pathMeasure
* Implement tangetAt
* add extractPath segment iterator
* Implement extractPath/chopCubicAt/chopQuadAt
* Wire up extractPath and add tests for cubic/quadratic
* Switch to interpolate on chopCubic
* addressed review comments

This reverts commit 594f6608.

This change creates a test only implementation of flutter::Surface backed by an
offscreen Vulkan GrContext. Much of the code in this test Surface was lifted
from flutter::VulkanWindow which I was unable to use without extricating it
from the VkSurface/VkSwapchain code which we do not want to use in offscreen
tests. I would recommend refactoring VulkanWindow to separate GrContext
creation and VkSwapchain creation in order to promote greater code reuse
between onscreen and offscreen vulkan paths.

This change is excersised thoroughly by the shell tests and was manually
tested against these tests on Fuchsia on Intel.

* Fixing launching Safari. This should solve the LUCI issue

* more comments and linking the issue

* Manual roll of Dart 0299903f3e...fcf88fe6fa

dart-lang/sdk@ fcf88fe6fa Revert "[vm/concurrency] Remove redundant isolates list, ensure shutdown procedure waits until the isolates actually got deleted"
dart-lang/sdk@ c894118574 [dart2js] Migrate js patch file to NNBD.
dart-lang/sdk@ 0d34bf5571 Remove another one of the unittest-like libraries.
dart-lang/sdk@ 40d544bc26 Always count non-core libs when tracking migration progress.
dart-lang/sdk@ 9e2d9ecd92 tests for missing getter/setter available suggestions
dart-lang/sdk@ 63c8bb7e46 Collect information about the AST structure at completion points
dart-lang/sdk@ c7b501625e Validate not only errors, but also warnings.
dart-lang/sdk@ 867d6537df enum constant and named cons test cases
dart-lang/sdk@ 01e079eff1 The initial dartdev pub * command - pass on all arguments from the 'dartdev pub *' invocation directly to 'pub *'.
dart-lang/sdk@ 4bde1f1851 Migration: test to make sure exact nullability isn't applied too much.
dart-lang/sdk@ ed705e8c84 Move DEAD_NULL_COALESCE reporting to ErrorVerifier.
dart-lang/sdk@ 93bb4b0f1b [dart2js] Migrate a couple of trivial libraries to nnbd.
dart-lang/sdk@ b03ef5b3fe Convert more doc comments in analysis_server
dart-lang/sdk@ 4ca3d267ee Run legacy co19 tests in analyzer-asserts-weak configuration.
dart-lang/sdk@ 166edab750 [dart2js] Migrate developer patch file to nnbd.
dart-lang/sdk@ 0838c9ebc2 Enable co19_2 legacy tests in the NNBD bots.
dart-lang/sdk@ d42b7bc15a partition imported/not-imported suggestion sets / de-dup
dart-lang/sdk@ 6a7d4e22b5 [vm/aot] Include entries for null in the dispatch table to avoid check.
dart-lang/sdk@ 27e64c309e [vm/aot] Optimize selector offsets for smaller instruction sequences.
dart-lang/sdk@ 1c2d378068 [vm/aot] Use TFA to eliminate unused selectors in dispatch table.
dart-lang/sdk@ 022b362e84 [vm/aot/tfa] Add missing visitor methods for call site instrumentation.
dart-lang/sdk@ e75c9192a1 Start converting dartdoc style in analysis_server
dart-lang/sdk@ 16033f922d Enable prefer_contains in analysis_server
dart-lang/sdk@ 1cc9413926 Add dartfix support for prefer_contains
dart-lang/sdk@ bcc0900e6a [vm] AOT blobs snapshots are obsolete. Remove dead code.
dart-lang/sdk@ a0323c755f convert test path (for windows)
dart-lang/sdk@ c90fca7188 [infra] Inline content of cloud epiloque file into approval script
dart-lang/sdk@ 902e2b097b Revert "[vm] Arm Assembler simplify code for SubImmediateSetFlags"
dart-lang/sdk@ c096f9d6e5 [gardening] Fix 3H patching logic with respect to newly added dependencies.
dart-lang/sdk@ 34447c8dbb Revert "[ VM ] Removed Dart_Allocate, Dart_AllocateWithNativeFields, and Dart_InvokeConstructor from embedding API"
dart-lang/sdk@ 0a8484ca20 [CFE/VM] Add patch after 'Use package config v2'
dart-lang/sdk@ f1d715b4d6 [dart2js] migrate dart:_interceptors and dart:internal patch files
dart-lang/sdk@ 3fbf5f93b6 [vm, service] Fix stack overflow in heap_snapshot.dart's data representation.
dart-lang/sdk@ 43bbf73da3 Update doc comments for dart:js_util
dart-lang/sdk@ fb7e6ba494 fix nnbd http parsing bug for http_headers_test
dart-lang/sdk@ cefd113de2 [dart2js] Migrate convert to nnbd.
dart-lang/sdk@ ddef611e04 Copy over the README.
dart-lang/sdk@ ca6cb6ce75 Always pass --default-language-version=2.7 to analyzer for legacy tests.
dart-lang/sdk@ 0a57671f90 [vm/nnbd] Use legacy types to create lists in Dart_NewListOf
dart-lang/sdk@ 5c332bea91 Stop using 'factory something() => null;' in most cases.
dart-lang/sdk@ 3d1b8b26c2 [ VM ] Removed Dart_Allocate, Dart_AllocateWithNativeFields, and Dart_InvokeConstructor from embedding API
dart-lang/sdk@ 91eee195fc [http] loosen status code constraints and rephrase some http exceptions
dart-lang/sdk@ 86b1b9d03c Enhance member depth completion metrics
dart-lang/sdk@ dd9adebad0 [dartdevc] Fixes to support un-forking dart:_runtime
dart-lang/sdk@ 84ff9e5008 Fix NullabilityEliminator to substitute type parameters in bounds.
dart-lang/sdk@ 0966e06ee4 Reland "[vm/nnbd] Enable type testing stubs in NNBD weak mode"
dart-lang/sdk@ f57f1eb56b Add an analyzer test step to test legacy code using the unforked SDK
dart-lang/sdk@ afaeb04137 sanity check project files for errors
dart-lang/sdk@ 4f6a5811fc Add json support to completion metrics computation
dart-lang/sdk@ 86f8e3438a Migrate language_2/async_nested to NNBD.
dart-lang/sdk@ b671b916d4 Treat the observatory service tests as opted out of NNBD.
dart-lang/sdk@ 78b1e15637 Don't report NULLABLE_TYPE_IN_CATCH_CLAUSE in opt-out libraries.
dart-lang/sdk@ 60295a2cef [dart2js] Migrate async_patch.dart to nnbd.
dart-lang/sdk@ 272a03a71d [ddc,dart2js] restore null check in dart:js
dart-lang/sdk@ 0fa3d79a3f Move applying LEGACY_ERASURE to isCorrectOverrideOf().
dart-lang/sdk@ e0621b65b2 [nnbd] Stop writing chunked into headers
dart-lang/sdk@ 9f4769fd30 [ddc] Add back nullcheck in js_array
dart-lang/sdk@ fa74c546b1 Use default FeatureSet for a file in its unlinked unit key hash.
dart-lang/sdk@ e34299101c Add back null check to _StreamIterator constructor in NNBD.
dart-lang/sdk@ c96f1928f6 Revert "[vm/nnbd] Enable type testing stubs in NNBD weak mode"
dart-lang/sdk@ 08778f9045 In legacy libraries apply LEGACY_ERASURE to concrete members.
dart-lang/sdk@ ad5ee10e69 [dart2js] Migrate a number of trivial libraries to nnbd fork.
dart-lang/sdk@ 30213c4188 Fix expression compiler tests on windows
dart-lang/sdk@ 5fd18be9c5 track analysis errors
dart-lang/sdk@ 31de73f074 [infra] Publish results messages to pub/sub at a slower rate
dart-lang/sdk@ 81d4ac07d4 [CFE] Use package config v2
dart-lang/sdk@ ed2df21191 [cfe] Decouple MemberBuilder from ClassMember
dart-lang/sdk@ 776b984115 [cfe] Correctly register parameters as initialized
dart-lang/sdk@ 6a2c350a3e [cfe] Fix isSubtypeOf for FutureOrs

* Update to edd64e6d5c7924a5fb1ef80c5226d24006e7977b

Exposes FlutterSurfaceView, and FlutterTextureView to FlutterActivity and FlutterFragment. (#41984, #47557) (#16552)

This reverts commit 8ec994b4.

The formatter didn't understand what was going on here and broke the
text. Changed these to use `<pre>{@code }</pre>` instead.

This reverts commit 6aacf5e7.

skiping tests in Safari. LUCI recipe for Mac is ready. this is the only step left for stopping us running unit tests in Safari (#16550)

Migrates to using os_log for app logging on iOS 13 and above, macOS
10.11 and above. On older platform, fall back to syslog(), which is what
we used previously.

This re-lands commit 78a89097 with a fix.
That commit was reverted in a61dbf2f.