Replace the two existing DDC sdk.js build targets:
```
flutter/web_sdk:flutter_dartdevc_canvaskit_kernel_sdk_amd
flutter/web_sdk:flutter_dartdevc_canvaskit_kernel_sdk_ddcLibraryBundle
```
with new variants:
```
flutter/web_sdk:flutter_ddc_canary_sdk
flutter/web_sdk:flutter_ddc_stable_sdk
```

This removes the dart_sdk.js artifact built with the AMD module system
flags. It is no longer supported and inaccessible from the flutter_tools
CLI. Other PRs are in flight to delete the remaining test references to
this module system that are no longer running.

This also prepares for the eventual flip of the DDC `--canary` flag
default back to `false`. We are now building a dart_sdk.js artifact with
the flag disabled.

Issue: #142060

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---------

Co-authored-by: Ben Konyi <[email protected]>

Part of #192568

The following tests are kept on 15 due to failing testing. We will fix
once we have macOS 26 bots in the try pool:
* Mac framework_tests_libraries
* Mac framework_tests_impeller
* Mac framework_tests_widgets
* Mac_build_test flutter_gallery__transition_perf_e2e_ios
* Mac mac_unopt < ci/mac_release_arm64_tests
* Linux linux_web_engine_tests < Mac run safari suites

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---------

Co-authored-by: Jackson Gardner <[email protected]>

…me (#193113)

Fixes #85831

While working on webp encoder for `image` package i noticed that flutter
does not render some animated webp and gifs with following exception:
```
======== Exception caught by image resource service ================================================
The following _Exception was thrown resolving an image frame:
Exception: Could not getPixels for frame 1

When the exception was thrown, this was the stack: 
Path: \\Mac\Downloads\gif\200w.webp
====================================================================================================
```
<details>
<summary>Code sample and visual demo with the files used, since the
issue has no screenshots and author did not provide his code
sample:</summary>

<img width="1491" height="819" alt="image"
src="https://github.com/user-attachments/assets/04e7dc17-bc7f-453f-ba28-5621d47c3f23"
/>

```dart
import 'dart:io';

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @OverRide
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Material App',
      home: Scaffold(
        appBar: AppBar(title: Text('Material App Bar')),
        body: Center(child: Column(children: <Widget>[
          Image.file(File(r'\\Mac\Downloads\gif\200w.gif'), height: 100,),
          Image.file(File(r'\\Mac\Downloads\gif\200w.webp'), height: 100,),

          Image.file(File(r'\\Mac\Downloads\gif\giphy.gif'), height: 100,),
          Image.file(File(r'\\Mac\Downloads\gif\giphy.webp'), height: 100,),

          Image.file(File(r'\\Mac\Downloads\gif\opaque_first_frame_bug.gif'), height: 100,),
        ])),
      ),
    );
  }
}
```

<details>
<summary>Webp and gif Images used for this sample:</summary>

<img width="200" height="356" alt="200w"
src="https://github.com/user-attachments/assets/abcbdd6e-d4d0-4e23-b88d-04c0e3d4a79e"
/>
<img width="56" height="100" alt="200w"
src="https://github.com/user-attachments/assets/8df4d356-1297-4aad-af85-a2b4bd23b606"
/>

<img width="480" height="480" alt="giphy"
src="https://github.com/user-attachments/assets/13b6952e-1bf9-49ec-b58f-52c5caf6fa04"
/>
<img width="100" height="100" alt="giphy"
src="https://github.com/user-attachments/assets/4d3bb3dc-0f8c-4384-9b1d-86e3a4474206"
/>
<img width="200" height="200" alt="opaque_first_frame_bug"
src="https://github.com/user-attachments/assets/5e41e321-04f4-4ad5-a9cd-90c0164e4c6a"
/>
</details>

</details>

It appears that this is an old issue in how Flutter uses Skia, because
for animated WebP and GIF, Skia's SkCodec::getInfo() reports the alpha
type of the first frame only, and its documentation doesn't mention that
(or at least i did not find it). Flutter allocates every frame's bitmap
from that info without checking getFrameInfo(i).fAlphaType, so Skia
rejects any later frame with alpha after an opaque first frame with
kInvalidConversion.

Tested on an engine built from master (e619960, Windows x64 release)
with an app that decodes every frame through `ui.instantiateImageCodec`:

| file | without the change | with the change |
|---|---|---|
| WebP, 59 frames, frames 46 and 53 have alpha | frames 46, 53 fail |
all decode |
| 3 WebP files, 15 frames each, frames 1-14 have alpha (lossy and
lossless) | frames 1-14 fail | all decode |
| GIF, opaque frame 0, frame 1 with transparency, disposal to background
| frame 1 fails | all decode |
| the same WebP frames with one alpha pixel in frame 0, and a GIF with
disposal none | all decode | all decode |

Fix: when `SkCodec::getInfo()` reports `kOpaque_SkAlphaType` for an
animation, `BuiltinSkiaCodecImageGenerator` now reports
`kPremul_SkAlphaType` if any later frame reports a non-opaque
`SkCodec::FrameInfo::fAlphaType`. Animations whose later frames all
report `kOpaque_SkAlphaType` stay opaque. APNG is decoded by
APNGImageGenerator, which this change doesn't touch.

The new tests in `testing/dart/codec_test.dart` use a 140-byte WebP and
a 70-byte GIF fixture. I ran `codec_test.dart` with `flutter_tester`
from a `host_debug_unopt_x64` build (Windows x64) with the Skia and
Impeller Vulkan backends, single and multithreaded: all 16 tests pass.
Without the change the two new tests fail with `Could not getPixels for
frame 1`. The Impeller OpenGL ES tests were not tested locally.

<details>
<summary>Screenshot after the fix, both with impeller enabled and
disabled:</summary>
<img width="1329" height="760" alt="image"
src="https://github.com/user-attachments/assets/a01da7d8-3c40-49a1-a312-4941d23128a2"
/>
</details>


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Upgrade flutter/flutter to Roblectric 4.17. Includes all neccessary
engine updates too. This is the latest and only version of Robolectric
that supports SDK 37.

Added a bunch of flags because JDK 17+ blocks reflective access to JDK
internals by default. Starting with 4.17, Robolectric's test environment
setup reflects into `jdk.internal.access`, so these are required. This
is the flag set
recommended by Robolectric, see
https://robolectric.org/getting-started/#running-with-java-17-and-higher.

Partially Addresses #189518

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Enables the `unawaited_futures` lint rule in
`analysis_options_common.yaml` across the Flutter repository.

Closes #168555

## Pre-launch Checklist

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Fixes] where supported.
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In #191841, we replaced `Shell::WaitForFirstFrame` with
`Shell::AddFirstFrameCallback` but didn't update the test names to match
the new API.

In particular, `WaitForFirstFrameTimeout` no longer tested that any
caller-visible timeout fired, since the new API manages the timeout
internally. The test now just verifies the first frame callback doesn't
fire when no frame has rendered.

Just naming changes, no semantic changes.

Issue: b/521830222


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Resolves the remaining `unawaited_futures` lints in
`engine/src/flutter/` after `unawaited_futures` was enabled in
`analysis_options_common.yaml` (#193125).

Part of #168555

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Added Android 17 device `cubs` to Firebase tests. Ran `gcloud firebase
test android models list` to check the device exists.

Partially Addresses #189518

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