Adds initial versions of DropdownButton DropdownMenuItem
Adds a dropdown menu button as shown in the Material design spec here: https://www.google.com/design/spec/components/buttons.html#buttons-dropdown-buttons. It's the video at the bottom of this section of the Material design spec.
This version of the component doesn't deal with scrollable menus or constrain the height of the menu.
Instead, we can just concatenate the records together, which means you can view
the generated trace file without post-processing. Also, I've made the trace
file world-readable, so that you can trace a device without needing root
access.
This will be shared by sky/updater and flutter_tools. Currently
bundle.dart and signing.dart are unmodified copies of the files from
updater and flutter_tools, respectively. This is so future changes are
easier to see.
This grid makes it significantly easier to track down errors when you're
looking at coordinates in a render tree dump and want to see if they're
what you expect or if they're wildly away from the right location.
* Remove most of mojo/dart/embedder
* Update roll.py to only import a subset of mojo/dart/embedder
* Add mojo/dart/observatory
* Update mojo_sdk_revision to get fixes to dart_pkg.py
These new PerformanceView classes are transforms over PerformanceViews.
The first is a cheap way to tell code that expects a performance to not
animate after all, and the other is a way to replace a view of a
performance going in one direction with a view of a performance going in
the other direction.
See also https://github.com/flutter/engine/issues/1708
Assert at build time that PageRoute route builders do not return null
widget trees.
Also very minor new code comments and code reorg to help make the heroes
patch easier to review.
(These are changes that are unrelated to Heroes but that were part of
the Heroes patch.)
The 0.2.1 release of the mojo package isn't actually compatible with Flutter
despite claiming to be a minor release. The real fix is to make Flutter
compatible with that release, but there are several yak shaves involved.
