So our future pull requests won't be polluted by the white space changes.

* Allow specifying the foreground paint

* fix typo

* doc update

* call paint.reset

Fixes https://github.com/flutter/flutter/issues/11961

Fixes https://github.com/flutter/flutter/issues/12630

* Make native wrapper classes non-abstract as they are instantiated from native code
* Make constructors of native wrapper classes private

* Analysis cleanup of the Dart in the Engine repo

* Update painting.dart

* Update painting.dart

Fixes https://github.com/flutter/flutter/issues/12377.

Fixes https://github.com/flutter/flutter/issues/12772

This reverts commit 86591145.

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

Fixes https://github.com/flutter/flutter/issues/7723

fixes flutter/flutter#6865

Added a Paragraph.didExceedMaxLines property to query when this occurs.

Needed for https://github.com/flutter/flutter/issues/7271

Also fix 'ellipsis' overflow handling to work for multiline text.

Fixes https://github.com/flutter/flutter/issues/7271

This enables text span styles to inherit attributes from the paragraph style

Previously we got some punctuation wrong.

See https://github.com/flutter/flutter/issues/4478

This patch makes three API changes:

 * The dart:ui library now always communicates in physical pixels. The
   framework is responsible for converting to whatever logical coordinate
   system it wishes to use.
 * The textBaselien property is now on TextStyle rather than ParagraphStyle,
   which will let us choose which baseline to use on a per-span basis rather
   than on a per-paragraph basis.
 * This patch also removes the old MojoServices function endpoints.

Fixes https://github.com/flutter/flutter/issues/3779
Fixes https://github.com/flutter/flutter/issues/1360

Also, with the comments.

We were off by one on, uh, everything.

This change disentangles the build for the snapshotter from the main engine
build. Also, we now have all the Dart files for dart:ui in the same directory.

This patch moves the remainder of painting and compositing into their
new home (and updates their style to match Google C++ Style).

This patch removes a number of the classes that were generating
Dart_GetField calls, particularly related to drawAtlas and drawVertices.
The functions that used these classes now use primatives instead, which
is more efficient.

* Expose a Paragraph.getWordBoundary method to dart.

Used by text selection to select a word.

All the clients of migrated to the new ParagraphConstraints API.

This patch begins to update the Paragraph interface to something sensible. It
introduces a ParagraphConstraints object that is passed to layout() to control
the layout of the paragraph. Once clients are migrated over, the argument will
become required.

Also, rename TextStyle#lineHeight to height.

We now use Canvas#drawParagraph.