* Transition to Hybrid lib/txt and blink text system.

* Revert "Enable line join styles and miter limit. (#3777)"

This reverts commit 5403f65b.

* Revert "Revert "Update switches to use StringView." (#3784)"

This reverts commit 80f039ff.

* Revert "Initial integration of libtxt with Flutter alongside Blink. (#3771)"

This reverts commit c548c65b.

* Add support for join types and miter limits.

* Fix miter limit data type.

* Adding some clearer documentation to painting.dart

* Clarifying more documentation.

* Code review changes

* Fixed debug printing of stroke width and miter limit

* Adding missing periods at the ends of sentences.

This reverts commit ffe8181f.

* Adding SemanticsFlag.isSelected

* typo

* Run Flutter on iOS and Android with color correct Skia (#3716)

***Turns on color correct rendering for Android and iOS
***Communicates dst color space to raster cache
***Turns on color space aware image decoding

Test:
***color_testing_demo on Pixel XL
***flutter_gallery on iPad Mini and iPad Pro (haven't figured out how to run manual_tests on iOS)

TODO:
I needed to split up this CL somewhere. These are follow-up tasks.
***Make desktop backends color correct
***Make debugging tools (ex: encoding frames to png) preserve color space
***Investigate using UIKit API to allow iOS to fine tune color space of rendered content

Fixes a Fuchsia breakage introduced in
dcfcc925.

***Turns on color correct rendering for Android and iOS
***Communicates dst color space to raster cache
***Turns on color space aware image decoding

Test:
***color_testing_demo on Pixel XL
***flutter_gallery on iPad Mini and iPad Pro (haven't figured out how to run manual_tests on iOS)

TODO:
I needed to split up this CL somewhere. These are follow-up tasks.
***Make desktop backends color correct
***Make debugging tools (ex: encoding frames to png) preserve color space
***Investigate using UIKit API to allow iOS to fine tune color space of rendered content

Fixes a regression introduced in
dcfcc925 in flutter_tester on Linux.

Eliminates logging to stdout on Android -- now using __android_log_print
only.

Eliminates logging to syslog on iOS -- now writing to stdout with the
existing ASL redirection (from platform_mac.mm) only. syslog() wasn't
ever picked up in logs.

This patch is a pre-factoring change before swapping out iOS engine
logging to a flutter-specific mechanism.

**This is a breaking change on iOS**

Previously, the `paused` state was entered when the application resigned
active status. `inactive` now maps to this status. `paused` now maps to
an app that has been backgrounded.

`inactive` is currently emitted on iOS only and corresponds to iOS's
foreground inactive state.

Current state transitions are:
`resumed` <--> `inactive` <--> `paused`

suspending is currently emitted on Android only and corresponds to the
transition to Android's stopped state.

Current state transitions are:
`resumed` <--> `paused` --> `suspending` --> `resumed`

These transitions may change in future.

Fixes https://github.com/flutter/flutter/issues/10087
Fixes https://github.com/flutter/flutter/issues/10233

Fixes https://github.com/flutter/flutter/issues/9439

This will ensure that the engine is not broken by a future
skia roll.

Skia doesn't actually create the image if we don't supply a color space.

Fixes https://github.com/flutter/flutter/issues/9473

Fixes https://github.com/flutter/flutter/issues/6774

Previously, it was a static. Doesn't have much effect in practice because we
only use this microtask queue for main isolates, which exist on a single
thread.

See https://github.com/flutter/flutter/issues/7626

This reverts commit cc931fe3.

This name is consistent with how the other `dart:` libraries are named now.

* Remove the Point class.

* Add Size.contains and Rect.translate for consistency

* Make Offset and Size compare == with subclasses.

Without this we would break the _DebugSize hack.

* Fix copy/pasta

* Fix the examples in the engine repo