Update Mojo

Don't crash if the scene has no root layer set.

The layout protocol in Mozart changed. Now we need to pipe a scene version
through the system to the compositor.

Add font styles to ParagraphStyle

Add static assert to check that all Dart wrappable instances are thread-safe reference-countable.

Also, rename TextStyle#lineHeight to height.

Set the CSS overflow-wrap property to enable line breaks within a word

Fixes https://github.com/flutter/flutter/issues/162

Fix Mac build

Update `flutter start` to `flutter run`

These commands are the same, but `run` is the new hotness.

Teach SkyShell about .packages files

Don't crash on Dart compile errors

Update base to pull in fixes for toolchain: clang_i386

Instead, just unwind as usual.

Fixes #2890

SkyShell now supports --packages instead of --package-root.

Support the JNI bridge in secondary isolates

This requires detaching from the JVM at thread shutdown using a callback
that was recently added to the Dart VM.

Add a --use-glfw flag to //sky/tools/gn

This flag makes it easier to enable the glfw configuration.

Also, fix an unrelated build error in loader.cc.

Teach sky_snapshot about .packages

The sky_snapshot tool now understands the --packages command-line flag.

Progress on https://github.com/flutter/flutter/issues/1351

Remove one type-related lint

We currently whitelist some types that don't need parameters. Turning on
this lint causes too many lint errors in Atom.

Sync lint rules with `flutter analyze`

This patch updates _embedder.yaml to enforce the same set of lints as
`flutter analyze`. We're still not enabling strong mode via this
mechanism, but we might consider that in a later patch.

Related to https://github.com/flutter/flutter/issues/2687

Directly load the bundle at a known path instead of doing a search by identifier.

Also fixes an issue where a error would get logged even though loading from the precompiled application bundle was successful.

Update to GLFW 3.2

The Material Gallery is now fully interactive.

Explicitly load and unload the precompiled code bundle.

If called via `bundleWithIdentifier:` the bundle may not have been loaded. This makes it explicit.