* Update Android sdkmanager for all platforms

* update readme

which rolls Dart to the latest version.

- includes Roll Dart to version 8d7219a5b6a7c2505ff57f23e7cf80da4c724512 (https://github.com/flutter/engine/commit/43327730a27344f1d45a1f9e4d53b14260778ce5)

includes the following CLs since the last roll
- Further improve painting.dart documentation. (#4505)
- Add support for --strong option in the engine, create a strong mode
  version of platform file (#4504)
- Apply texture transform on Android (#4513)
- [fuchsia] Removed the flutter_app template. (#4511)
- This adds RPC call to set asset path. (#4323)
- Fix windows build by using lambda capture workaround (#4514)
- Add missing include for sk_malloc_throw

This broke the coverage tool, as material/animated_icons/animated_icons.dart
was loaded twice as a part, once directly animated_icons_private_test, and one
through animated_icons_private_test->flutter_tester->...->material

The coverage package assumes a 1:1 mapping between VM scripts and URIs due to a
limitation in the underlying vm_service_client package, which currently doesn't
provide a unique identifier for VM scripts.

The underlying issue is tracked by dart-lang/coverage#194.

* Send RPC request to switch assets directory on hot reload.

This is needed to pick up updated assets that are expected to be picked up on hot reload.

* Assert assets directory is not null.

* Better multiple future wait

* Add type annotation

* updated docs to remove note about windows tests not working

* reverted formatting

This simply updates the package dependencies by running flutter update-packages --force-upgrade.

I'm doing this with no other changes, because the last time I tried that, redness occurred. I want to isolate the problem to a "clean" update of the packages.

It looks like the plugins device_info, connectivity, and url_launcher haven't yet had their gradle configurations updated, so they fail when trying to build with the new gradle. I did not upgrade for those three packages only (in flutter_gallery) until we are ready to fix them (fixing them for master will break them for alpha users, so we need to do an alpha roll to do that).

* Plumb a --strong option through to the front end server and the engine
so that we can run flutter apps in preview-dart-2 and strong mode

* - Address analyzer lint issues
*- correctly set up strong mode option in the case of AOT builds

This reverts commit 36e3b103 to make the build green.

SDK now includes the following versions:

* Tools: 25.2.5
* Platform Tools: 27.0.1
* Build Tools: 27.0.3
* Android 6.0 (API 23)
* Android Support Repo: 47
* Google Play Services: 46

This started breaking the analyzer following https://github.com/flutter/flutter/pull/13889
The test version of the material_animated_icons did not include the meta
package (needed for the @required tag) and was also not including all
the generated icons files.

Ideally we should find a way to fix this without enumerating all the
icons in the test file.
But for now just adding the missing file to fix the build breakage.

This reverts commit b56295aa.

This reverts commit 25b1d43a.

* modernize capability names in devicelab task manifest

* replace windows too

* Roll engine to 37789650cb1254199426e5de5cc66c2ba63cbaf2
* Fix large integer literals in packages/flutter/test/services/message_codecs_test.dart

Try again now since texture-related test-breaking PR was backed out.

Fixes #13743 
Fixes #12379
Follow-up to #13745

Also adds an option to hide gestures introduced by `InkWell` and `InkResponse` from the semantics tree (see also `GestureDetector.excludeFromSemantics`).

Reformats a SafeArea introduced in #13853.

* Remaining code changes for Dart 2.0 SDK roll

Applies horizontal safe area insets to the animation demo in the
Gallery. Specifically, this ensures the back button is positioned
consistently with iOS expectations and that that main image card in the
detail view respects safe area insets.

This is to support the iPhone X sensor housing notch and other similarly
creative display features when in landscape orientation.

Applies horizontal safe area insets to the video demo in the Gallery.
This is to support the iPhone X sensor housing notch and other similarly
creative display features when in landscape orientation.

* Revert "Roll engine to e122f4825726035e4579471ef83848b1aa796444 dart roll"

This reverts commit c7dfadfa.

* Revert "Roll engine to just before dart roll"

This reverts commit d5cc8657.

* Revert "Revert "Enable developers to run pod from terminal directly and skip pod install if possible. (#13374)" (#13770)"

This reverts commit 0759043e.

* some nits on cocoapods code

* put back the FLUTTER_FRAMEWORK_DIR env variable