* Added the superellipse (a.k.a. squircle) shape to flutter, which is needed to recreate some cupertino components, e.g. buttons in pixel-perfect detail (issue #13914).

* [WIP] BAB theme

* [WIP] BAB theme

* Update goldens

* Extract helper function in tests

* Update Goldens version

* Add tests

* [WIP] Hans first round comments

* Added test

* Added docs

* Hans second round comments

* Fixed analyzer error

* Hans third round comments

* ambient

* Change [BottomAppBarTheme.of] to static

* Final doc change

* the onStart callback will report the location of the pointer where it wins the gesture arena by default instead of the pointer down location. Fixes all tests related to changing this default value.

https://github.com/flutter/engine/compare/7112b72cc229...e5ec3cf3ea5c

git log
7112b72cc229e05d36716c3d7739885d3ffa72e6..e5ec3cf3ea5ce78c6c3116271601f60d30a799d4
--no-merges --oneline
e5ec3cf3e Dart SDK roll for 2019-01-08
08c95d27a Roll src/third_party/skia 55ff5d3ba881..1337f5b85978 (10
commits) (flutter/engine#7407)
e385f5cbb Roll src/third_party/skia 26d173fee72b..55ff5d3ba881 (12
commits) (flutter/engine#7406)
0f8273b0c Dart SDK roll for 2019-01-07
4036b260a Reset ParagraphBuilder after build() (flutter/engine#7401)
4820cbec4 Dart SDK roll for 2019-01-07
8eccb860d Add onStart hook to FlutterFragmentActivity
(flutter/engine#6719)
f2ea838b3 Roll src/third_party/skia b2fdcbf3033f..26d173fee72b (10
commits) (flutter/engine#7400)
5ca8aadaa Announce in/out of list (flutter/engine#6918)
4487d392d Replace Java code with equivalent, more concise code.
(flutter/engine#7398)
395b7852d Roll src/third_party/skia 46ee3f7a8ff5..b2fdcbf3033f (11
commits) (flutter/engine#7394)
5965f9084 Make `ParagraphConstraints` have const constructor
(flutter/engine#7346)
e02dd416a Roll src/third_party/skia a47eb455360f..46ee3f7a8ff5 (2
commits) (flutter/engine#7390)
f0038b3cc Roll src/third_party/skia 3ac3a4053f86..a47eb455360f (2
commits) (flutter/engine#7389)

* Force DatePicker value to stay within firstDate and lastDate upon year change

* updated per review feedback

* Add Robert Penner’s easing functions

These easing functions are the most popular functions in use on the web
and other platforms. Including them in Flutter will encourage users to
create more engaging and attractive animations.

Adds avatarBorder property to SelectableChipAttributes and uses the outer path to draw the darkened layer.

This reverts commit 08538f91.

* Adds start behavior option to the drag gesture recognizer and makes it the default option when a drag gesture recognizer is created. Also fixes all the tests to work correctly with the new default behavior.

* Ensure all errors thrown by image providers can be caught by developers.

Add an `onError` parameter to the ImageCache.putIfAbsent method.
In the event that an error is thrown when resolving an image, catch if
this parameter is provided. Use the onError parameter to ensure that all
errors thrown are forwarded to the ImageStream error channel instead of
directly into the void.

* Add didSendFirstFrameEvent service extension.

flutter/engine#7307 changes the engine side of embedded UIView to only
reject gestures when the framework sends a `rejectGesture` message, so
that gesture resolution can done after a touch sequence has ended (see
PR description for flutter/engine#7307 for more details).

This change makes the framework send a `rejectGesture` message to the
engine when a UiKitView rejects a gesture.

I'm planning to land this PR before the engine side change, so right now
it swallows the exception thrown if there is no engine implementation
for `rejectGesture` (which keeps us with the current behavior). After
this change lands I'll land the engine PR, and then clean up the part
that swallows the exception.

* Include cursor in textfield intrinsic width measurement

* Add cursorWidth assertion, add comment about assumed cursor width, and test null stepWidth

Top left and top right for big FABs, and top left for mini FABs.

* Switch over to the new name for compilation trace native function.

Also see: https://github.com/flutter/engine/pull/7256

* rename

* roll the engine

* Fix bug in calculation of downstream text distance when aligned: right

* After having affinity explained to me, match getOffset and tests to
expected behavior

* Clean up test formatting and fix analyze errors

* Improve test comments and reorganize a bit

* Specify logical pixels

* adds Force Press gesture detector and recognizer

* Themable elevation on dialogs.

* AlertDialogs Title/Content text styles

* Themable elevation on dialogs.

AlertDialogs Title/Content text styles

* finish merging change

* fixing tests

* Docs fixes

* Change const to final to fix analyzer errors

* Fix analyzer errors

* Remove dart:ui import

* Hans Comments