* Add synchronization to ResourceContext usage

* debug

* Use unique ptr factory

* formatting

* left more notes for future readers

* Roll dart to f5fc335a4cdfcf96ae550044c64044ffe599e595

* Update license hash

* Roll a little further to pick up a revert

* Update hash

Made changes to assets/ build/ flow/ runtime/ and shell/ to allow for
compilation on Windows.

* Added Windows support for libtxt in order to build flutter_tester.exe.

Relatively minor changes were needed to get libtxt building on Windows
(missing/incompatiable headers, the odd syscall, path separators, etc.).
Windows doesn't render text in the same way as other platforms, so some tests
that checked for specific pixel offsets are disabled.

This drops the ViewInsets class in favour of the existing WindowPadding
class for representing the view insets.

* Roll dart version in flutter engine.

* Update license file.

Window.viewInsets is the set of window-relative insets that describe the
area of the window that an application may want to treat as effectively
reducing the size of the content. Typically this is due to system UI
that fully obscures underlying content, such as the keyboard.

This area differs from padding in that padding is the set of insets that
describe the area of the window that may be partially (or fully)
obscured by system UI or physical intrusions into the view area (e.g.
iPhone X sensor housing, status bar, or the iPhone X home indicator
widget).

This patch does not yet enable the iOS bottom edge safe area. Once the
framework has been updated to use viewInsets for bottom-edge occlusions
(today, the keyboard), the bottom safe area will be enabled and
framework patches that depend on it, landed.

* Removed stray character.

* Added missing include.

* Fixed formatting.

Set a pending dimension change in the animator only if the viewport's physical width/height changed (#4400)

Fixes https://github.com/flutter/flutter/issues/13183

* Run frontend server from temp directory to force absolute URIs in Kernel file.

* Create special directory to cwd into to avoid conflicts with app sources in temp folder

* Make variable final

As we anyway always recommend to set the target_os to android.
Also if you happen to not set the target_os to android it messes up the licenses script output.

* Move texture registry ownership to platform view

This enables the texture registry to survive activity pause on Android.

* Remove debug info

* Formatted

* Set texture registry on initial rasterizer

* Remove unneccessary std::move

This reverts commit e58764fb.

* Move texture registry ownership to platform view

This enables the texture registry to survive activity pause on Android.

Picks up:
1. Windows support for flutter tester
2. Spaces in Dart package paths in the loader.

If Progress is instantiated with a max of 0, throw immediately to avoid
a divide-by-zero later in toString(). This typically happens if the tool
recurses over an empty top-level component, which can happen when a
component is moved around in the repo and the developer hasn't cleaned
up old empty directories from their git client.

Fixes an errrant tab and unnecessary braces.

This keeps the futures chain shorter.

* Enable flutter engine to also work with .*so files on android

We would like to be able to use native tools (e.g. simpleperf, gdb) with
precompiled flutter apps.  The native tools work much better with *.so
files instead of the custom formats the Dart VM uses by default.

This CL adds support for being able to load the flutter app from an *.so
file on Android.

* Add sanity check to ensure we have either shared library or instruction snapshot (but not both)

The new ui.Codec API is a superset of the implementation in
image_decoding.cc. While we are not using ui.decodeImageFromList in the
framework anymore, we keep the dart function for backward compatability, and
just make it a thin wrapper around the codec API.

When checking whether render buffer size has changed, apply the device
scale factor used to convert points to pixels to ensure we're not
needlessly re-allocating render buffer storage.

Adds trace + debug log to make this easier to detect in future.

Originally introduced in 2d530dae, but
rolled back in 0a6e415b to test whether
it was responsible for regressions to
flutter_gallery_ios__transition_perf benchmarks:
  * average_frame_build_time_millis
  * missed_frame_build_budget_count

Re-landed in d43d3534, and reverted in
459f722b after it appeared to regress
the above two benchmarks. After recent changes to microtask execution
order which fixed https://github.com/flutter/flutter/issues/9998,
re-introducing this fix results in benchmark improvements to the above
two benchmarks in local testing.

The "raw" pointer is already managed by ARC.

It speeds up local development workflow when doing changes to the front end
when ninja automatically rebuilds the frontend_server.dart.snapshot.