Fixes https://github.com/flutter/flutter/issues/5684

* refactor _run to runCmd

* replace requiresProjectRoot getter with call to commandValidator

* replace requiresDevice getter with call to findTargetDevice

* trace command requires a debug connection, not a device

* inline androidOnly getter

* rename command methods to verifyTheRunCmd and runCmd

* move common verification into BuildSubCommand

* rename deviceForCommand to device

* rename methods to verifyThenRunCommand and runCommand

As per our style guide, if you can't explain something, refactor it. I
studied this function for a while and still can't explain it, so...

Fixes #5872

See #4434.

Fixes #3208.

Fixes #4618.

Renamed expansion_panels.dart to expansion_panel.dart.

Changed drawer header to use theme's divider color.

Having this base class lets classes like CustomPainter and DataTableSource be
more agnostic as to what's generating the repaints.

The engine now reports coordinates in physical pixels.

Also, make ProxyWidget and ProxyElement public.

Fixes #4505

This moves all of the various .analysis_options* files to the flutter repo root so that it's easier to
* remember to keep them all in sync, and
* easily refer customers to them

Also, fix an old TODO, and add a test of various things on TextStyle.

...requires an engine roll to pick up https://github.com/flutter/engine/pull/3025 and https://github.com/flutter/engine/pull/3027.

Fixes https://github.com/flutter/flutter/issues/5840

Moves BorderRadius to above its first use.
Slight improvements to the BoxShape docs.

Changed MergableMaterial to animated between states that have dividers
and those that don't in order not to have dividers that appear
unanimatedly. Fixes #5847.

* Added OverscrollIndicatorEdge et al

* RefreshIndicator only clamps its scrollable edge

* added a test

* Updated the test

* fixed lint-os

* fixed a typo

* Scrollable should restore its viewport dimensions when it reappears

* removed an accidental commit

* updated per review feedback

part of https://github.com/flutter/flutter/issues/5789

The deprecation period has ended and we believe its clients have migrated to
other solutions.

Fixes #2205

cleanup https://github.com/flutter/flutter/issues/5789

Using paths' arcTo was causing performance issues in the Gallery.
This commit uses Skia's optimized drawArc in order to improve
performance, and it rolls the engine to the newest assing build.
Fixes #3599.

Tracking Skia issue:
  https://bugs.chromium.org/p/skia/issues/detail?id=5227

* Build unlinked summaries for packages on upgrade.

* Iterate through the packages in folders.

* Rollback the debug change.

fixes https://github.com/flutter/flutter/issues/5788

To avoid orphaning people on the deprecated alpha branch, this patch teaches
`flutter upgrade` to switch to the master branch.

This commit renames all debugAssertValid methods to
debugAssertIsValid and assert BoxConstaints validity in
constructors. Fixes #5807.

BUG=https://github.com/flutter/flutter/issues/5373