Pipelines vend single use continuations that callers can complete at any time to signal readiness of a pipeline resource. (#2957)

If the vsync provider is being replaced, make sure the animator expects no more signals from the old registration. (#2954)

Make the animator host an implicit fallback VSync provider in case platforms cant provide their own. (#2953)

This reverts commit 26f89708.

* Add config properties to specify snapshot blob file names.

This adds the ability of the shell to override the default
dart aot snapshot blob file names, and it wires up Android's
FlutterMain to recognize the properties in the app's manifest.

This will be used for flutter applications that build their
binary snapshots into files other than the default ones
that the engine uses.

Also, clean out some unneeded dependencies from engine/platform.

`VSyncProviderFallbackImpl` for platforms that lack the ability to provide real VSync callbacks. (#2941)

Will only be used by Linux Desktop for now.

This is now the canonical location of the Mojo public SDK.

We don't yet have support for text on Fuchsia. This patch add stub
implementations of Paragraph and ParagraphBuilder so that Flutter apps
that use text don't error out. Instead, the text is 0x0 and invisible.

Also, teach MojoServices not to crash if it hasn't been created by the
time Dart tries to use it.

We can actually use multiple threads now that they work properly.

Depending on the type of bundle path specified, initialize either the zip or directory asset bundle. (#2933)

Regression introduced in https://github.com/flutter/engine/commit/cee7fef7

Fixes https://github.com/flutter/flutter/issues/5424

Also, teach gn how to build application bundles.

After this patch, we're able to run spinning_square on Fuchsia. I've
left some TODO comments about some shortcuts I've taken that we'll need
to improve in the future.

This patch should contain all the code we need to run Flutter on
Fuchsia's software framebuffer (without text). I haven't actually tried
running the code, so I'm sure it doesn't work yet.

Also, rename SkyViewClient to RuntimeDelegate. These names are more
sensible.

This patch also cleans up the RuntimeDelegate a bit, for example by
removing support for flushing real-time events, which aren't used.

We're now producing a flutter_content_handler binary for Fuchsia that
builds and links.

This data is actually used in //flutter/runtime, so it makes more sense to
generate it and include it in the build from there.

Now lib/ui depends on sky/engine rather than the reverse.

https://github.com/flutter/flutter/issues/4866