Fix input when hardware renderer drawing is disabled.

When drawing is disabled the window's layer won't have a valid buffer. This
causes surfaceflinger to set the window's touchableRegion to zero.
This commit sets a window crop when drawing is disabled, so surfaceflinger
set touchableregion from crop instead of buffer.
And it modifies LetterboxUiController to not reset the crop.

Test: cts and perf tests as documented in go/android-slimulator-dev-env
Bug: 229870984
(cherry picked from commit 32dfc98382)
Merged-In: I4d6ca513c3daf5818ded03eae00e551fc319ad69
Change-Id: Ic8e1b17af825951505d448509530edf3ea81af5b

core/java/android/view/ViewRootImpl.java

@@ -8152,6 +8152,7 @@ public final class ViewRootImpl implements ViewParent,
                     mLastSyncSeqId, mTmpFrames, mPendingMergedConfiguration, mSurfaceControl,
                     mTempInsets, mTempControls, mRelayoutBundle);
             mRelayoutRequested = true;
+
             final int maybeSyncSeqId = mRelayoutBundle.getInt("seqid");
             if (maybeSyncSeqId > 0) {
                 mSyncSeqId = maybeSyncSeqId;
@@ -8191,6 +8192,12 @@ public final class ViewRootImpl implements ViewParent,
             }
         }
 
+        if (mSurfaceControl.isValid() && !HardwareRenderer.isDrawingEnabled()) {
+            // When drawing is disabled the window layer won't have a valid buffer.
+            // Set a window crop so input can get delivered to the window.
+            mTransaction.setWindowCrop(mSurfaceControl, mSurfaceSize.x, mSurfaceSize.y).apply();
+        }
+
         mLastTransformHint = transformHint;
       
         mSurfaceControl.setTransformHint(transformHint);

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

@@ -481,7 +481,7 @@ final class LetterboxUiController {
     }
 
     private void updateRoundedCorners(WindowState mainWindow) {
-        final SurfaceControl windowSurface = mainWindow.getClientViewRootSurface();
+        final SurfaceControl windowSurface = mainWindow.getSurfaceControl();
         if (windowSurface != null && windowSurface.isValid()) {
             final Transaction transaction = mActivityRecord.getSyncTransaction();