See https://github.com/flutter/flutter/issues/7626

Instead of updating to match new HID touchscreen hacks exposed by
magenta, just remove the direct input layer entirely.  Mozart all the
time from now on.

The flutter_tester executable works just fine.

This ensures SkOpts are initialized before we start using Skia.

As advised.

 - Fix flutter_aot_app template for moved Flutter tool GN label.
 - Add missing dart:io tree-shaking roots.
 - Add example AOT app to catch future breakage.

This was exposed by minimal builds which do not build //flutter.

This reverts commit cc931fe3.

Earlier, when the —enable-vulkan flag was specified, the out directory name was determined by the other flags specified to `flutter/tools/gn`. But, the build itself was Vulkan enabled. Now that we are going to add the vulkan target to buildbot, we want to clearly delineate a Vulkan enabled build from a non-Vulkan enabled one.

Fixes Vulkan backend.

This includes fixes for SkPicture::cullRect and SkShadowUtils updates.

* Add debug mode background

* Review notes

Update buildtools to c8db819853bcf8ce1635a8b7a395820f39b5a9fc and restrict downloaded artifacts. (#3611)

This updates our compilers, gn and ninja. Also, we now explicitly specify the buildtools artifacts we actually use instead of downloading everything from the catalog.

The build error was due to unused lambda captures being reported as warnings (which we turn into errors).

The other libraries don't repeat the "dart" name in their path inside the
package.

Mainly improvements to javadoc and error logging. A bit of refactoring.

This name is consistent with how the other `dart:` libraries are named now.

Makes it much easier to get it running under gdb.

* Update Skia to 30229ac6282981c28ced8f513c8d09684d9d0581 and fix build.
* Update licenses.

We were unnecessarily alarming users when they used the software backend. Fixes https://github.com/flutter/flutter/issues/9394