* Roll Dart SDK to b43da048c31a16b9993de1536406ed014ef73ffd

* Update licenses.golden for Dart SDK

* Update LICENSE for sky_engine

Add MultiLicense license class

Fixes https://github.com/flutter/flutter/issues/7557

Generated by pub in tools/licenses for license aggregation.

fixes flutter/flutter#6865

The first 23 lines of the BoringSSL license contain informational text
including Buganizer issue numbers that is not part of the license text
itself.

* Add OpenSSL as supported licence type

Adds special handling for the OpenSSL licensed files under BoringSSL.
Specifically, some of the ARM assembly files in the latest Dart SDK are
dual-licensed with OpenSSL.

* Support blocks that ref by type with no copyright

The upcoming Dart SDK includes files (e.g., sha256-armv4.S) with a block
that specifies teh code is dual-licenced under OpenSSL, but doesn't
include a copyright date of its own.

The GPUSurfaceGL holds references to Skia objects that may own GL objects.
If the GL objects are destructed on the GPU thread after the EGL context has been
dropped, then the GL delete calls will not take effect.

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

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

This was causing exceptions on Jellybean

Previously, search by license type only searched the contents of the
chain of direct ancestor subdirectories. This change broadens the search
to the full subtree of the current license root when no license is found
in the chain of direct ancestor directories.

Fixes https://github.com/flutter/flutter/issues/6586

Used in ARM assembly in BoringSSL after Dart SDK SHA
c1f00f786a87c36374f31818e6acf86ed1065e44.

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

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

See https://github.com/flutter/flutter/issues/7431

In 54d1913d, we extracted a regular expression matching licence
indentation. This patch extracts two more instances.

On macOS diff -u6 results in:
  diff: `-6' option is obsolete; use `-U 6'
the latter syntax is supported on both Linux and macOS.

Fixes https://github.com/flutter/flutter/issues/7226

* Roll Dart SDK to 3a422bceb76d6155cab0c728b68f2badad8ff0e9

* Update licences.golden for latest Dart SDK

Add a couple missing newlines.

Not shipped to clients.

Fixes https://github.com/flutter/flutter/issues/7200

Add a getter for flutterView in FlutterActivity. This allows fullscreen flutter apps to extend FlutterActivity and do custom stuff with the flutter view. (#3324)

The API was updated recently so platforms can report memory usage for the
rasterizer to display as an overlay.

The Skia team says these APIs are outdated and should be removed. They
do not appear to have any clients.

Fixes https://github.com/flutter/flutter/issues/7202
Fixes https://github.com/flutter/flutter/issues/7204

Fixes https://github.com/flutter/flutter/issues/7294

Detach the EGL surface from the GPU thread and then destroy it during the FlutterView surfaceDestroyed callback (#3316)

Fixes https://github.com/flutter/flutter/issues/7147