This will allow customers to try out the lightweight isolate support in the Dart VM in AOT mode.

To be future proof, we also add the negative flags to the allow list, thereby allowing the Dart VM to
change the default in the future, while still allowing customers to opt out.

Issue b/158554251

Add a new field, max_frames_in_flight, to FlutterRunnerProductConfiguration. This allows it to be configurable from Fuchsia.

Tests were added as well to verify the new behavior.

Originally font change notification was handled by forwarding
WM_FONTCHANGE to the Flutter HWND, to avoid adding new API surface, but
that's not a good solution in a multi-window scenario, and it would
require a completely different solution for UWP. It also requires
non-obvious plumbing in the runner.

This replaces that with an explicit API, so that there's a clean and
obvious way for the runner to trigger this event.

This patch applies the following changes:

* Rename a stray .cc file to .mm (connection_collection.cc).
* Migrate Objective-C #includes to #import as per the style guide.
* #include/#import order updated to reflect the style guide order:
  associated header, system/standard library headers, library headers,
  platform-specific includes.
* Include cstring where we're using strlen.
* Add a missing copyright header in SemanticsObjectTest.mm.

Bugs: https://github.com/flutter/flutter/issues/60025

Adds the hasStrings method for Mac, and improves the state of unit testing on Mac.

Fixes the following compilation errors:
../../flutter/shell/platform/linux/fl_platform_plugin.cc:89:7: error: use of undeclared identifier 'strcmp'
  if (strcmp(format, kTextPlainFormat) != 0) {
      ^
../../flutter/shell/platform/linux/fl_platform_plugin.cc:127:7: error: use of undeclared identifier 'strcmp'
  if (strcmp(method, kSetClipboardDataMethod) == 0)
      ^
../../flutter/shell/platform/linux/fl_platform_plugin.cc:129:12: error: use of undeclared identifier 'strcmp'
  else if (strcmp(method, kGetClipboardDataMethod) == 0)
           ^
../../flutter/shell/platform/linux/fl_platform_plugin.cc:131:12: error: use of undeclared identifier 'strcmp'
  else if (strcmp(method, kSystemNavigatorPopMethod) == 0)
           ^
../../flutter/shell/platform/linux/fl_view.cc:194:7: error: use of undeclared identifier 'strcmp'
  if (strcmp(pspec->name, "scale-factor") == 0) {
      ^
../../flutter/shell/platform/linux/fl_engine.cc:67:18: error: use of undeclared identifier 'strrchr'
  gchar* match = strrchr(l, '@');
                 ^
../../flutter/shell/platform/linux/fl_engine.cc:75:11: error: use of undeclared identifier 'strrchr'
  match = strrchr(l, '.');
          ^
../../flutter/shell/platform/linux/fl_engine.cc:83:11: error: use of undeclared identifier 'strrchr'
  match = strrchr(l, '_');
          ^
Signed-off-by: NDamian Wrobel <dwrobel@ertelnet.rybnik.pl>

This converts the GTK keyboard code to track the key down states of the lock modifiers NumLock and CapsLock so that they represent the actual "down" state of the key, rather than the lock state itself.

GTK tracks the lock state, and Flutter expects the down state.

Cleans up header order/grouping for consistency: associated header, C/C++ system/standard library headers, library headers, platform-specific #includes.

Adds <cstring> where strlen, memcpy are being used: there are a bunch of places we use them transitively.

Applies linter-required cleanups. Disables linter on one file due to included RapidJson header. See https://github.com/flutter/flutter/issues/65676

This patch does not cover flutter/shell/platform/darwin. There's a separate, slightly more intensive cleanup for those in progress.

We currently use a mix of C standard includes (e.g. limits.h) and their
C++ variants (e.g. climits). This migrates to a consistent style for all
cases where the C++ variants are acceptable, but leaves the C
equivalents in place where they are required, such as in the embedder
API and other headers that may be used from C.

The directory may be invalid when running shell_unittests because
some tests call SetCacheDirectoryPath and then delete the directory.
Later tests that try to use that cache base path will be unable to
open the directory.

Make a single-param ctor explicit in order to prevent surprising
implicit conversions.

Add a check for zero message-size and don't malloc/memcpy the incoming
message in those cases.

Add braces where they were missing.

Add copyright headers in a few files where they were missing.

Trim trailing blank comment line where present, for consistency with
other engine code.

Use the standard libtxt copyright header in one file where it differed
(extra (C) and comma compared to other files in libtxt).

This also amends tools/const_finder/test/const_finder_test.dart to look
for a const an additional four lines down to account for the copyright
header added to the test fixture.

- Standardize on lowercase for windows.h
- Don't define NOMINMAX before including windows.h in (some) public
  wrapper headers, since it causes a warning when combined with setting
  NOMINMAX at the build level, which is the more robust way to avoid
  issues with min/max and windows.h

The template now uses the FlutterEngine versions.

Removes the older pointer-based versions of APIs taking EncodableValues for which there are now reference-based versions.

Fixes the following compilation errors:

../../flutter/shell/platform/linux/fl_value.cc:267:3: error: use of undeclared identifier 'memcpy'
  memcpy(self->values, data, sizeof(uint8_t) * data_length);
  ^
../../flutter/shell/platform/linux/fl_value.cc:284:3: error: use of undeclared identifier 'memcpy'
  memcpy(self->values, data, sizeof(int32_t) * data_length);
  ^
../../flutter/shell/platform/linux/fl_value.cc:294:3: error: use of undeclared identifier 'memcpy'
  memcpy(self->values, data, sizeof(int64_t) * data_length);
  ^
../../flutter/shell/platform/linux/fl_value.cc:304:3: error: use of undeclared identifier 'memcpy'
  memcpy(self->values, data, sizeof(double) * data_length);
  ^

../../flutter/shell/platform/linux/fl_string_codec.cc:29:28: error: use of undeclared identifier 'strlen'
  return g_bytes_new(text, strlen(text));
                           ^

../../flutter/shell/platform/linux/fl_standard_message_codec.cc:512:23: error: use of undeclared identifier 'strlen'
      size_t length = strlen(text);
                      ^
Signed-off-by: NDamian Wrobel <dwrobel@ertelnet.rybnik.pl>

* Fixed ios layout change to not refocus semantics object if the focus is outside of flutter

* update

* addressing comments

Fixes https://github.com/flutter/flutter/issues/65258

The following devicelab tests should pass after this patch:

- flutter_gallery_sksl_warmup__transition_perf_e2e_ios32
- flutter_gallery_sksl_warmup_ios32__transition_perf

We get huge ANRs in not pure flutter app.
We found that 0.15% of the engine initialization took more than 10 seconds, every 10 million starts.

This reverts commit 575a5194.

Lazy async stacks were already enabled by-default in AOT mode in [0] - which made the
gen_snapshot invocations use "--lazy-async-stacks --no-causal-async-stacks".

This change does the same with the engine defaults, which makes this be enabled
by-default in JIT mode as well.

See go/dart-10x-faster-async for more information.

This is a re-land: A fix for what we believe to have caused the last revert has landed upstream in Dart in dart-lang/sdk@0004589

[0] flutter/flutter@3478232