Also update the AOT builder for changes to the layout of the sky_engine package

* send the base uri back to debuggers

* add a fullRestart parameter to app.restart

* add await

Also, add a "flutter build flx --report-licensed-packages" option for
when you need to get the list of the packages affected by licenses.

* make flutter run work with a pre-built apk

* refactor to remove the buildDir param

* support hot mode from the daemon protocol

* move method params to constructor

* General improvoments to the loader app:
   * Show a message after 8 seconds if no connection comes in.
   * Show a progress bar as files are being uploaded.
   * Hide the spinner just before launching the application.

* General improvements to the "flutter run" UI:
   * Add "?" key as a silent alias for "h".
   * Make the help text bold so it doesn't get mixed with the logs.
   * Make "R" do a cold restart when hot reload is enabled.

* Supporting features and bug fixes:
   * Add support for string service extensions.

* Other bug fixes:
   * Expose debugDumpRenderTree() outside debug mode.
   * Logger.supportsColor was missing a getter.
   * Mention in the usage docs that --hot requires --resident.
   * Trivial style fixes.

* This reverts commit 5e7e7b6e.

* default to lib/main.dart

This reverts commit 32ad81c8.

* making flutter run work with gradle

* locate android studio

* add test for settings

* review comments

The new `empty_statements` lint (in the next DEV roll), flags these empty statements.  Harmless, except the one in `basic.dart` that fixes a real-life bug. :)

Previously these widget had zero test coverage. Also, improve the
coverage tooling Mac.

* send the reload source command for ios simulators

* review changes

* rewrite w/ a completer

`flutter test` now has a `--merge-coverage` flag that can be used to merge
coverage data from previous runs, enabling faster iteration cycles.

We now download the base coverage file automatically.

#4672