Replace use of LruMap with a pure LinkedHashMap

Handle NaNs in constraints, just in case.

...so that we can shed the quiver dependency in flutter's framework.

CustomPaint documentation

prettier IconData toString

Port to crypto 0.9.2

...followed all the way back to ImageCache, ImageInfo, ImageProvider,
and friends.

Rationalise the overflow render boxes

Fixed VirtualViewport child key assignment

New RenderAligningShiftedBox abstract class for render boxes with
"alignment", which as of now is:

 - RenderPositionedBox
 - RenderConstrainedOverflowBox (ex RenderOverflowBox)
 - RenderSizedOverflowBox
 - RenderFractionallySizedOverflowBox (ex RenderFractionallySizedBox)

(The respective widgets are Align, OverflowBox, SizedOverflowBox, and
FractionallySizedBox. They haven't been renamed.)

Also I added some toString details.

change how we calculate the temp dir

Fix RenderFractionallySizedBox's constraints logic

Fixes https://github.com/flutter/flutter/issues/2735

Provide APIs for exchanging messages with the host application

Update the engine

Fix Fast Fling Failure

Use the artifacts store for iOS assets

Update engine.version to get the ApplicationMessages interface

Dont differentiate between ios_arm and ios_x64 in flutter_tools

All artifacts for iOS are universal.

don't wait for the observatory if the app didn't start

Bump engine revision and ensure the Xcode project setup expects assets at the archive root.

Remove `analyze` tear-off regexp.

Scrollable sometimes pushes frames forever

Update engine.version

Fix _LazyWidgetProvider indexing, move Ali Connors

We were setting a negative velocity tolerance, which never triggered because we
assume tolerances are positive numbers. Now we use a positive tolerance and
assert to catch this case in the future.

Fixes #2765

Allow customizing of Switch thumbs