Clear touch region on dream overlay container on start.

Since the updated TouchInsetManager logic only sets the touch regions
for surface controls of tracked views, the dream overlay's touch
region will not be set if no view is tracked. This changelist ensures
that the touch region for the overlay is cleared on attach.

Test: atest DreamOverlayContainerViewControllerTest#testRootSurfaceControlInsetSetOnAttach
Fixes: 276023607
Change-Id: I8cc96ba3c1d35510620ca6ed605e386fe11aecc1

packages/SystemUI/src/com/android/systemui/dreams/DreamOverlayContainerViewController.java

@@ -25,6 +25,7 @@ import static com.android.systemui.dreams.complication.ComplicationLayoutParams.
 
 import android.animation.Animator;
 import android.content.res.Resources;
+import android.graphics.Region;
 import android.os.Handler;
 import android.util.MathUtils;
 import android.view.View;
@@ -223,6 +224,9 @@ public class DreamOverlayContainerViewController extends
         mJitterStartTimeMillis = System.currentTimeMillis();
         mHandler.postDelayed(this::updateBurnInOffsets, mBurnInProtectionUpdateInterval);
         mPrimaryBouncerCallbackInteractor.addBouncerExpansionCallback(mBouncerExpansionCallback);
+        final Region emptyRegion = Region.obtain();
+        mView.getRootSurfaceControl().setTouchableRegion(emptyRegion);
+        emptyRegion.recycle();
 
         // Start dream entry animations. Skip animations for low light clock.
         if (!mStateController.isLowLightActive()) {

packages/SystemUI/tests/src/com/android/systemui/dreams/DreamOverlayContainerViewControllerTest.java

@@ -26,8 +26,10 @@ import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.when;
 
 import android.content.res.Resources;
+import android.graphics.Region;
 import android.os.Handler;
 import android.testing.AndroidTestingRunner;
+import android.view.AttachedSurfaceControl;
 import android.view.ViewGroup;
 import android.view.ViewRootImpl;
 import android.view.ViewTreeObserver;
@@ -75,6 +77,9 @@ public class DreamOverlayContainerViewControllerTest extends SysuiTestCase {
     @Mock
     ComplicationHostViewController mComplicationHostViewController;
 
+    @Mock
+    AttachedSurfaceControl mAttachedSurfaceControl;
+
     @Mock
     ViewGroup mDreamOverlayContentView;
 
@@ -108,6 +113,8 @@ public class DreamOverlayContainerViewControllerTest extends SysuiTestCase {
         when(mDreamOverlayContainerView.getResources()).thenReturn(mResources);
         when(mDreamOverlayContainerView.getViewTreeObserver()).thenReturn(mViewTreeObserver);
         when(mDreamOverlayContainerView.getViewRootImpl()).thenReturn(mViewRoot);
+        when(mDreamOverlayContainerView.getRootSurfaceControl())
+                .thenReturn(mAttachedSurfaceControl);
 
         mController = new DreamOverlayContainerViewController(
                 mDreamOverlayContainerView,
@@ -127,6 +134,12 @@ public class DreamOverlayContainerViewControllerTest extends SysuiTestCase {
                 mBouncerlessScrimController);
     }
 
+    @Test
+    public void testRootSurfaceControlInsetSetOnAttach() {
+        mController.onViewAttached();
+        verify(mAttachedSurfaceControl).setTouchableRegion(eq(Region.obtain()));
+    }
+
     @Test
     public void testDreamOverlayStatusBarViewControllerInitialized() {
         mController.init();