Adds handling for the autocorrect field on TextField on iOS devices.

Instead of flushing each canvas, flush once on the context from which each of the canvas is derived.
This gives us a significant performance increase on the fuchsia vulkan backend

See https://github.com/flutter/engine/pull/3866

This reverts commit 2d9155e1.

Fixes a regression with semitransparent images (flutter/flutter#11169)

Related to https://github.com/flutter/engine/pull/3870.

flutter_tester was throwing a bad_weak_ptr while setting up the engine
because the PlatformViewTest was held in a unique_ptr

This action is triggered when the user swipes (in accessibility mode) to the last visible item of a scrollable list to bring that item fully on screen.

iOS implementation to follow.

See https://github.com/flutter/flutter/issues/11168

This reverts commit 2062ca14.

Previously WaitForFirstDisplayDriver() would return, prematurely,
on the first event in "/dev/class/display".  This would cause apps
started before the GPU driver came up to fall back on SW
rendering.

Fixes https://github.com/flutter/flutter/issues/10723

This reverts commit d67b614a.

Fuchsia TO-370

Fixes flutter/flutter#9128

* Roll Dart to 1bfd01c1f7a57fed039ce8ab95df2a5f14cf63b6

* fix licence

* Use Dart_Closure instead of looking up _getMainClosure

* Restore comment

* Fix comment

* Restore comment

This somehow introduces text relocations even though we always use -fPIC.

Roll Dart VM to daa38a2ea21d290e45adb509dc60418b22ec7eba for fix to Thumb profile sample collection.

Roll buildroot to b0b836db790abff26695a944224a4934480f2f48.

Closes dart-lang/sdk#29971

See https://github.com/flutter/flutter/issues/11041

Roll Dart to f445c318184b30b3db997ac27f357bcb5d45670a.

Fuchsia issue TO-365

Fixes https://github.com/flutter/flutter/issues/10061

See also https://github.com/flutter/engine/pull/3701

* Roll dart and buildroot deps since they have to be updated together to get and use prebuilt dart sdk in correct location.

* Update license

Fixes https://github.com/flutter/flutter/issues/11007

Fix target name for flutter_patched_sdk so it doesn't conflict with patched_sdk target name, doesn't confuse ninja with depfile defined as .d (#3834)

* Revert "Revert "Reland "Run Flutter on iOS and Android with color correct Skia" (#3818)" (#3823)"

This reverts commit db8d8a99.

* Fix test code to match internal API change

* Build Flutter patched-sdk with kernel artifacts

* Switch to new dart_host_toolchain argument mechanism to let dart patch_sdk know of host_toolchain.

* Update dart dependency

* Updated licenses

* Rename dart dependencies tag so they have just 'dart_'-prefixed dart's names.

* Fix indentation and line breaks for newly added deps.

* Add toolchain for windows host

* Update dart revision

* Licenses

* Update licenses

* Revert changes to licenses_third_party