Add embedded font assets to the asset list

Inherited widgets should work across reactivations

Tweaks to Border to make it easier to subclass.

Any font asset referenced in the fonts section of flutter.yaml will now be
included in the FLX assets.  It's no longer necessary to separately list the
font in the assets section.

Previously we updated only the reactivated element's inherited widgets. Now we
update all the inherited widgets for the whole subtree that's being
reactivated. We need to visit the whole subtree anyway, so there isn't much of
a loss.

Fixes #2733
Fixes #2438
Fixes #1701

Fix minor typos (EdgeInsets, ImageResource)

Also, more docs. Also, expose isUniform.

An example showing how to send messages between the host app and Flutter

Remove wrong comment

Allow run_mojo command to run an app at a URL.

This test is no longer disabled.

Fixes #2827

filter some noisy messages from adb logcat

print the os from flutter doctor

re-work the doctor command

In the spirit of "you are what you measure", let's measure some more things...

Scrollable physics should be reasonable when sizes change

filesystem or not.

Fixes #2113

Previously, when the content extent changed during a scroll interaction, we'd
stop the current scroll interaction and reset the scroll offset. Now we try to
continue the scroll interaction (e.g., drag, fling, or overscroll) even through
the underlying scroll behavior has changed.

For physics-based scroll interactions, we keep the current position and
velocity and recompute the operative forces. For drag interactions, we keep the
current position and continue to let the user drag the scroll offset.

After this patch, we still disrupt non-physical scroll animations that are
operating outside the new scroll bounds because it's not clear how we can
sensibly modify them to work with the new scroll bounds.

Fixed a typo

Expose the engine-src-path flag in the Gradle plugin

Update SkyApplication to SkyMain in the hello_android example

TwoLevelList fails to restore sublist expanded state

Update ChildView after Mojo roll

Set FLUTTER_ROOT to an absolute path

The Mozart API has changed.

This implementation was taken from the Dart SDK shell scripts.

BUG=https://github.com/flutter/flutter/issues/2795

Replace use of LruMap with a pure LinkedHashMap

Handle NaNs in constraints, just in case.