[Reland] Unmodified android sdk bundle (flutter#179920)

Relands flutter#179647

There were only two failing tests (there were also two bringup failures,
the `mac_arm64_mokey` versions of these)

https://ci.chromium.org/ui/p/flutter/builders/prod/Mac_mokey%20run_release_test/3866/overview

https://ci.chromium.org/ui/p/flutter/builders/prod/Mac_mokey%20run_debug_test_android/5454/overview

They failed with the same logs
```
Task result:
{
  "success": false,
  "reason": "Task failed: flutter run  had unexpected output on standard error."
}
```

The stderr in question:
```
[2025-12-15 14:06:56.311794] [STDOUT] run:stderr: - integration_test requires Android NDK 28.2.13676358
[2025-12-15 14:06:56.311989] [STDOUT] run:stderr: Fix this issue by using the highest Android NDK version (they are backward compatible).
[2025-12-15 14:06:56.312019] [STDOUT] run:stderr: Add the following to /opt/s/w/ir/x/w/rc/tmpr6kj09d_/flutter sdk/dev/integration_tests/ui/android/app/build.gradle:
[2025-12-15 14:06:56.312074] [STDOUT] run:stderr: 
[2025-12-15 14:06:56.312092] [STDOUT] run:stderr:     android {
[2025-12-15 14:06:56.312144] [STDOUT] run:stderr:         ndkVersion = "28.2.13676358"
[2025-12-15 14:06:56.312162] [STDOUT] run:stderr:         ...
[2025-12-15 14:06:56.312205] [STDOUT] run:stderr:     }
```

We can just set the ndk version to `flutter.ndkVersion`, which is this
value. It's also what is set in the templates, so it isn't a hack that
doesn't represent a real flutter app. Verified the tests pass now with
```
../../bin/cache/dart-sdk/bin/dart bin/test_runner.dart test -t run_release_test
../../bin/cache/dart-sdk/bin/dart bin/test_runner.dart test -t run_debug_test_android
```

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we expect every widget to implement].
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- [x] I listed at least one issue that this PR fixes in the description
above.
- [x] I updated/added relevant documentation (doc comments with `///`).
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[test-exempt].
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Fixes] where supported.
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---------

Co-authored-by: Gray Mackall <mackall@google.com>

Author: gmackall

.ci.yaml

@@ -615,7 +615,7 @@ deps = {
      'packages': [
        {
         'package': 'flutter/android/sdk/all/${{platform}}',
-        'version': 'version:36v3'
+        'version': 'version:36v4unmodified'
        }
      ],
      'condition': 'download_android_deps',

DEPS

@@ -36,14 +36,6 @@ android {
     namespace = "com.example.a11y_assessments"
     compileSdk = flutter.compileSdkVersion
 
-    // Flutter's CI installs the NDK at a non-standard path.
-    // This non-standard structure is initially created by
-    // https://github.com/flutter/engine/blob/3.27.0/tools/android_sdk/create_cipd_packages.sh.
-    String systemNdkPath = System.getenv("ANDROID_NDK_PATH")
-    if (systemNdkPath != null) {
-        ndkVersion = flutter.ndkVersion
-        ndkPath = systemNdkPath
-    }
 
     compileOptions {
         sourceCompatibility = JavaVersion.VERSION_17

dev/a11y_assessments/android/app/build.gradle

@@ -29,14 +29,6 @@ android {
     namespace = "com.yourcompany.complexLayout"
     compileSdk = flutter.compileSdkVersion
 
-    // Flutter's CI installs the NDK at a non-standard path.
-    // This non-standard structure is initially created by
-    // https://github.com/flutter/engine/blob/3.27.0/tools/android_sdk/create_cipd_packages.sh.
-    String systemNdkPath = System.getenv("ANDROID_NDK_PATH")
-    if (systemNdkPath != null) {
-        ndkVersion = flutter.ndkVersion
-        ndkPath = systemNdkPath
-    }
 
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_17

dev/benchmarks/complex_layout/android/app/build.gradle

@@ -29,14 +29,6 @@ android {
     namespace = "com.example.macrobenchmarks"
     compileSdk = flutter.compileSdkVersion
 
-    // Flutter's CI installs the NDK at a non-standard path.
-    // This non-standard structure is initially created by
-    // https://github.com/flutter/engine/blob/3.27.0/tools/android_sdk/create_cipd_packages.sh.
-    String systemNdkPath = System.getenv("ANDROID_NDK_PATH")
-    if (systemNdkPath != null) {
-        ndkVersion = flutter.ndkVersion
-        ndkPath = systemNdkPath
-    }
 
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_17

dev/benchmarks/macrobenchmarks/android/app/build.gradle

@@ -29,14 +29,6 @@ android {
     namespace = "com.yourcompany.microbenchmarks"
     compileSdk = flutter.compileSdkVersion
 
-    // Flutter's CI installs the NDK at a non-standard path.
-    // This non-standard structure is initially created by
-    // https://github.com/flutter/engine/blob/3.27.0/tools/android_sdk/create_cipd_packages.sh.
-    String systemNdkPath = System.getenv("ANDROID_NDK_PATH")
-    if (systemNdkPath != null) {
-        ndkVersion = flutter.ndkVersion
-        ndkPath = systemNdkPath
-    }
 
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_17

dev/benchmarks/microbenchmarks/android/app/build.gradle

@@ -16,14 +16,6 @@ android {
     namespace = "dev.flutter.multipleflutters"
     compileSdk = 36
 
-    // Flutter's CI installs the NDK at a non-standard path.
-    // This non-standard structure is initially created by
-    // https://github.com/flutter/engine/blob/3.27.0/tools/android_sdk/create_cipd_packages.sh.
-    String systemNdkPath = System.getenv("ANDROID_NDK_PATH")
-    if (systemNdkPath != null) {
-        ndkVersion = "28.2.13676358" // This version must exactly match the version of the NDK that the recipe pulls from CIPD.
-        ndkPath = systemNdkPath
-    }
 
     compileOptions {
         sourceCompatibility = JavaVersion.VERSION_17

dev/benchmarks/multiple_flutters/android/app/build.gradle

@@ -29,14 +29,6 @@ android {
     namespace = "dev.benchmarks.platform_views_layout"
     compileSdk = flutter.compileSdkVersion
 
-    // Flutter's CI installs the NDK at a non-standard path.
-    // This non-standard structure is initially created by
-    // https://github.com/flutter/engine/blob/3.27.0/tools/android_sdk/create_cipd_packages.sh.
-    String systemNdkPath = System.getenv("ANDROID_NDK_PATH")
-    if (systemNdkPath != null) {
-        ndkVersion = flutter.ndkVersion
-        ndkPath = systemNdkPath
-    }
 
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_17

dev/benchmarks/platform_views_layout/android/app/build.gradle

@@ -29,14 +29,6 @@ android {
     namespace = "dev.benchmarks.platform_views_layout_hybrid_composition"
     compileSdk = flutter.compileSdkVersion
 
-    // Flutter's CI installs the NDK at a non-standard path.
-    // This non-standard structure is initially created by
-    // https://github.com/flutter/engine/blob/3.27.0/tools/android_sdk/create_cipd_packages.sh.
-    String systemNdkPath = System.getenv("ANDROID_NDK_PATH")
-    if (systemNdkPath != null) {
-        ndkVersion = flutter.ndkVersion
-        ndkPath = systemNdkPath
-    }
 
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_17

dev/benchmarks/platform_views_layout_hybrid_composition/android/app/build.gradle

@@ -29,14 +29,6 @@ android {
     namespace = "io.flutter.examples.stocks"
     compileSdk = flutter.compileSdkVersion
 
-    // Flutter's CI installs the NDK at a non-standard path.
-    // This non-standard structure is initially created by
-    // https://github.com/flutter/engine/blob/3.27.0/tools/android_sdk/create_cipd_packages.sh.
-    String systemNdkPath = System.getenv("ANDROID_NDK_PATH")
-    if (systemNdkPath != null) {
-        ndkVersion = flutter.ndkVersion
-        ndkPath = systemNdkPath
-    }
 
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_17