This reverts commit bb3c49a9.

This adds support for adding a cml file to a fuchsia package. The
cml file will be compiled to a cm file and included in the archive.

Fulfill HostView.getCurrentFocusState and HostView.getNextFocusState platform message requests to deliver focus-related events to dart code.

Consolidate focus functionality (including requestFocus handling) to a new "FocusDelegate" class.

See https://cs.opensource.google/fuchsia/fuchsia/+/main:sdk/fidl/fuchsia.ui.views/view_ref_focused.fidl for details about focus state transitions and their meanings.

See https://fxbug.dev/77481.

This reverts commit 58a4669a.

This PR accomplishes many things:
- Unblocks input resampling on Fuchsia
- Fixes 2 frame scheduling issues resulting in wasted work and missed frames
- Removes the now-defunct VsyncRecorder class
- Prepares the VsyncWaiter class for the Embedder API by moving all logic out of it
- Adds hundreds of lines of unittests for Fuchsia scheduling logic to validate the performance and correctness benefits

In preparation for #25551, rename SessionConnection to
DefaultSessionConnection. The plan is to have SessionConnection be an
interface we can create a fake of for testing purposes.

This reverts commit 8c14250f.

Switch to scenic allocator and Image3 API.
Co-authored-by: NDavid Reveman <reveman@google.com>

See: b/163653659

Remove the gni file, as it is confusing things

This reverts commit 12a37478.

The fuchsia code around metrics and sizing was just sending this
information through a side-channel, when the engine already had the
information available. So, delete all of it to make future CLs simpler.

Additionally, the SceneUpdateContext has many unneccesary dependencies
re: metrics and PaintTasks. Break those to make future CLs simpler.

Tested: Ran all unittests and ran workstation on Fuchsia
BUG: 53062, 53063

* Manual roll of Dart from 24c7666def...40fd1c456e

dart-lang/sdk@40fd1c456e Revert "[dart:io] Add Abort() on HttpClientRequest"
dart-lang/sdk@17d7296a42 [vm/nnbd/bytecode] Fix reuse of type arguments in bytecode
dart-lang/sdk@58b6f40c73 Issue 42797. Understand in legacy libraries that a function returning Never (in Null Safety library) never returns. (reland)
dart-lang/sdk@fc8a6d9f9b [VM/compiler] Dereference TypeRef literal when propagating constants.
dart-lang/sdk@0689ec527a Move "test.dart" (well, most of its contents) into pkg/test_runner.
dart-lang/sdk@1094b3c61d Prepare static error test updater tool to handle web tests.
dart-lang/sdk@b258585f2f [observatory] Migrate from deprecated isInstanceOf to isA.
dart-lang/sdk@dfe1d9b682 Disable OverrideContributor for Cider.
dart-lang/sdk@aea99b2f5c scope debug property assist to Diagnosticables
dart-lang/sdk@4b96f20a79 [dart:io] Add Abort() on HttpClientRequest
dart-lang/sdk@1b1a39708c [build] Use frameworks instead of libs
dart-lang/sdk@3fef522496 Revert "Reland "[vm] Replaces fuchsia.deprecatedtimezone""
dart-lang/sdk@8c664d4f3f Revert "Issue 42797. Understand in legacy libraries that a function returning Never (in Null Safety library) never returns."
dart-lang/sdk@2efb5bebc7 [ dart:_http ] Fix typo in HTTP response timeline event
dart-lang/sdk@0884dae36c Revert "Fix the #include path for ICU headers"
dart-lang/sdk@5171534e81 Scope tweaks. Report REFERENCED_BEFORE_DECLARATION in more places.
dart-lang/sdk@6bba75079a Issue 42797. Understand in legacy libraries that a function returning Never (in Null Safety library) never returns.
dart-lang/sdk@b4ebbb7f5c [build] Update gn to match Fuchsia
dart-lang/sdk@cb428a7a02 [dart2js] Remove old bug work around in collector.
dart-lang/sdk@08663c20ab Change flutter patch to match existing DEPS on master branch
dart-lang/sdk@146ad014d9 update js/meta for the 2.10 dev sdk
dart-lang/sdk@488c718793 [co19] Roll co19 to d79951e06e443213243e54c2c32694b79a221b65
dart-lang/sdk@ba20edd7be Add patch for flutter-engine when changing to version 2.10

* Rev buildroot to latest version.

* Update license.

* update.

* Update gn revision.

* Format BUILD.gn files as the gn revision has been updated.

Tweak the primary flutter build rule so that fuchsia is more similar to
other platforms in how tests and the shell are built.

Only embedder_unittests and GLFW tests are disabled on Fuchsia now.

TEST: Ran unittests on host/fuchsia; workstation on fuchsia
BUG: fxb/53847, fxb/54056

This reverts commit fae8141f.

This reverts commit a974b781.

We can build unoptimized code for easier debugging with this flag.

Additionally create "_next" permutations for all of the test binaries
on Fuchsia, in order to test both code-paths.

Using the #define follow-up CLs can also create a flutter_runner_next
binary that does not contain any legacy integration code.

BUG: 53847

This allows Fuchsia components executed by the Flutter runner to
specify a directory containing assets if they wish to store assets
separate from program data. This is specified in the program metadata
field within the component's specification with the new "assets"
attribute. If this attribute is absent, assets are loaded relative to
the path specified in the "data" attribute as before.

This is useful in the short term to use a location in the package where
we can store small files more efficiently. It is also potentially
useful longer term to enforce a stronger separatation between
executable program data and non-executable assets.

This commit adds some basic unit testing for the data parsing to the
flutter_runner_tests suite.

In order to better support different products on Fuchsia, we should
change performance-sensitive attributes based on config files passed in.
This change does so for `vsync_offset`.