When a Virtual Display is plugged in, we create a corresponding surface

whose mutation should be owned by mSyncRoot(Owned by
DisplayManagerService). However, there is an operation of getting the
defaultSize of this Display which is performed without honouring the
mSyncRoot.

Bug: 211153738
Test: Manual
Change-Id: I5bedf0f25dc4635d828b96312f7f799fb9ed321c

services/core/java/com/android/server/display/DisplayDevice.java

@@ -131,7 +131,7 @@ abstract class DisplayDevice {
      * Only used for mirroring started from MediaProjection.
      */
     @Nullable
-    public Point getDisplaySurfaceDefaultSize() {
+    public Point getDisplaySurfaceDefaultSizeLocked() {
         return null;
     }
 

services/core/java/com/android/server/display/DisplayManagerService.java

@@ -3880,8 +3880,8 @@ public final class DisplayManagerService extends SystemService {
                 if (device == null) {
                     return null;
                 }
+                return device.getDisplaySurfaceDefaultSizeLocked();
             }
-            return device.getDisplaySurfaceDefaultSize();
         }
 
         @Override

services/core/java/com/android/server/display/VirtualDisplayAdapter.java

@@ -302,7 +302,7 @@ public class VirtualDisplayAdapter extends DisplayAdapter {
         }
 
         @Override
-        public Point getDisplaySurfaceDefaultSize() {
+        public Point getDisplaySurfaceDefaultSizeLocked() {
             if (mSurface == null) {
                 return null;
             }