Skip letterboxing if the activity below is embedded

Embedded activities are resize-able and won't be letterboxed

Bug: 270681405
fixes: 280898266

Test: SizeCompatTests
Test: manual - repro step in bug

(cherry picked from commit b828087)
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:ad7d89c22bf53fbcfd1f8d5a1ae2c611c376e9b3)
Merged-In: Ic7b1c4b40960fd04de9efbf4f6d7abee45c93025
Change-Id: Ic7b1c4b40960fd04de9efbf4f6d7abee45c93025

Author: Louis Chang

services/core/java/com/android/server/wm/LetterboxUiController.java

@@ -1595,9 +1595,9 @@ void onActivityParentChanged(WindowContainer<?> parent) {
                 FIRST_OPAQUE_NOT_FINISHING_ACTIVITY_PREDICATE /* callback */,
                 mActivityRecord /* boundary */, false /* includeBoundary */,
                 true /* traverseTopToBottom */);
-        if (firstOpaqueActivityBeneath == null) {
+        if (firstOpaqueActivityBeneath == null || firstOpaqueActivityBeneath.isEmbedded()) {
             // We skip letterboxing if the translucent activity doesn't have any opaque
-            // activities beneath
+            // activities beneath or the activity below is embedded which never has letterbox.
             return;
         }
         inheritConfiguration(firstOpaqueActivityBeneath);

services/tests/wmtests/src/com/android/server/wm/SizeCompatTests.java

@@ -475,7 +475,25 @@ public void testApplyStrategyToMultipleTranslucentActivities() {
     }
 
     @Test
-    public void testTranslucentActivitiesDontGoInSizeCompatMode() {
+    public void testNotApplyStrategyToTranslucentActivitiesOverEmbeddedActivities() {
+        mWm.mLetterboxConfiguration.setTranslucentLetterboxingOverrideEnabled(true);
+        setUpDisplaySizeWithApp(2000, 1000);
+        mActivity.info.screenOrientation = SCREEN_ORIENTATION_PORTRAIT;
+        mActivity.mDisplayContent.setIgnoreOrientationRequest(true /* ignoreOrientationRequest */);
+        // Mock the activity as embedded without additional TaskFragment layer in the task for
+        // simplicity.
+        doReturn(true).when(mActivity).isEmbedded();
+        // Translucent Activity
+        final ActivityRecord translucentActivity = new ActivityBuilder(mAtm).build();
+        doReturn(false).when(translucentActivity).matchParentBounds();
+        doReturn(false).when(translucentActivity).fillsParent();
+        mTask.addChild(translucentActivity);
+        // Check the strategy has not being applied
+        assertFalse(translucentActivity.mLetterboxUiController.hasInheritedLetterboxBehavior());
+    }
+
+    @Test
+    public void testTranslucentActivitiesDontGoInSizeCompactMode() {
         mWm.mLetterboxConfiguration.setTranslucentLetterboxingOverrideEnabled(true);
         setUpDisplaySizeWithApp(2800, 1400);
         mActivity.mDisplayContent.setIgnoreOrientationRequest(true /* ignoreOrientationRequest */);