KeyboardServiceImpl's setText method was dropping the new text on
the floor instead of passing it on to the KeyboardServiceState.
Then it was passing the selection indices through, so they were
out of range, which the Android runtime doesn't like.

Fixes #964.

Fix bustage by adding a DartConverter<unsigned long>.

Also, update a comment to explain why unsigned long long is special.

Remove IDL from engine/core/text

Instead, use our new template magic.

Reduce the boilerplate when creating bindings

Instead, use C++ template to generate the callback trampolines and the
registration block.

Remove IDL from engine/core/compositing

Rather than using IDL code generation, we now use some template magic to
generate this code. No all the code is template-generated yet, but this
patch is a start in that direction.

Add iOS implementations for MediaPlayer volume and looping setters

Revert "Roll Skia"

This reverts commit eeafe3a5.

rev engine

Provide callbacks for activity pause and resume events

Add MediaPlayer methods for volume and looping

Check the image decoder's failed flag after obtaining the frame buffer

Some decoders (e.g. JPEG) do not execute the decode until the call to
frameBufferAtIndex.  If the decode fails, we should not try to return a
bitmap.

Add patched-yasm back to DEPS for use by libjpeg_turbo

rev engine

Revert to libjpeg_turbo

We had switched to libjpeg, but libjpeg was failing to decode images when
built with the defines in our .gn files

rev engine

In SoundPool, have the client provide stream IDs

In SoundPool, have the client provide stream IDs so future API calls aren't gated on completion of Play()

Also use an array to represent channel volumes instead of assuming two channels

rev engine

Build script used by builders to package the unified Xcode project

Switch snapshotter and application runner based on Xcode target

Remove //third_party/BUILD.gn

We no longer need this hack to mux between libjpeg and libjpeg_turbo.

Roll Skia