Fix typo in image raster offset

We shouldn't plumb the "right" value into the y coordinate.

Remove Xcode harness for building the engine

Stocks FAB "+" sometimes teleports to near the top left

The matrix argument to drawPicture doesn't seem to do what we want exactly.
Instead, use the normal matrix in the canvas. Also, handle cull rects with
non-zero left and top coordinates.

Fixes #1229

Move //sky/compositor to //flow

Now that the compositor doesn't have any tricky deps, we can make it a
top-level project, which saves a bunch of typing.

Trim unneeded depedendencies from sky/compositor

Now we just depend on Skia and Base, which makes the compositor easier
to understand.

Also, update our skia/ext/refptr.h to match the current version of the
code in Chromium. This version adds support for several useful C++11
patterns.

Enable raster cache in compositor

Fix build with -Werror=return-type

We need to return a value from these functions to make clang happy.

The raster cache show some significant speedups in some situations.
Let's turn it on by default and learn more.

In this patch, I've also switched us away from using the
SkPictureImageGenerator because the preroll patches haven't landed in
Skia yet. Once those have landed, we might want to switch back.

JNI bridge support for constructors, arrays, and strings

Dont fail the build when trying to detect if the archive can be uploaded

Implement simple method calls in the Dart/JNI bridge

Add 'HandleRealTimeEvents' to window.

Upload Xcode artifacts from the build server if access to the service account is available

Remove deprecated Dart methods

All the clients have migrated to the new methods.

Fixes https://github.com/flutter/flutter/issues/1080

TabView children don't render correctly

The matrix parameter to drawPicture doesn't quite work the way we expected.
This patch moves us back to using the translate function on SkCanvas.

Fixes https://github.com/flutter/flutter/issues/1205

Also adopt a standard pattern for handling exceptions in JNI APIs

Use a slightly faster path for drawImage

ShaderLayer should actually be ShaderMaskLayer

The shader is supposed to be drawn on top of the children as a mask. The
previous drawing code was incorrect.

Add ShaderLayer to Flutter compositor

We need this to implement RenderShaderMask properly. See #1155.

Update Dart revision to pull in iOS fixes

https://codereview.chromium.org/1571343003

revving engine

sky_engine and sky_services were somehow not aligned, so I pulled them
both up to the next highest number.

Fix bindings for drawAtlas