Also, resolve our package conflict, since reflectable has been fixed.

Not as

It has performance implications in release mode.

We'll enable the lint once https://github.com/dart-lang/linter/issues/195 is fixed.

Improve InputValue#toString

Test harness should check for running Timers and AnimationControllers

After running a widget test, we now clear out the widget tree and check that we
didn't leak any timers or animations.

Also, fix several bugs that this addtional check revealed.

Fixes #2481

Adds initial version of Markdown renderer

Add `flutter_tools build` hooks to also generate depfile.

fix a regression in flutter logs

Fixes #1942.

Use lowerBound() from package:collection/collection.dart

Added SizeTransition

fix a npe in lastLogcatTimestamp

Remove //examples/widgets

Most of the remaining widget examples are actually manual tests. This patch
moves them into //dev/manual_tests. A couple are examples of using services,
which I've moved to //examples/layers/services. The remainder are out-dated and
are removed by this patch.

Support undo in the leave-behind demo

Support reparenting state from MultiChildRenderObjectElement

Add ServiceProtocolDiscovery with tests

Fixes #2085

Drop the argument to SceneBuilder's constructor

CheckedPopupMenuItem now fades its icon when changed.

BUG=https://github.com/flutter/flutter/issues/2274

Update engine.version

RenderCustomMultiChildLayoutBox shouldn't be sizedByParent

ImageFit.cover doesn't respect alignment

We need to apply the alignment to the source rect because the ouput rect fills
the destination rect.

Fixes #1514

Be more verbose when downloading artifacts

The getSize function from MultiChildLayoutDelegate might depend on information
other than the incomming constraints.

Fixes #2077

Remove bogus intrinsic size assert