Only updateDisplayDecoration if not the default

The default value for DISPLAY_DECORATION is false. If there's a new
SurfaceControl, we only need to set the flag if it's true. This avoids
applying an unnecesary transaction.

It also prevents a boot failure which is independently fixed by
Ib11d46439db57b90486bad07dd90f2cf0822182a.

Bug: 211797674
Bug: 211835607
Bug: 212402133
Test: boots
Change-Id: Iccb662f9a6312b547b3d28fa1f5c1e9ff5dce9eb

core/java/android/view/ViewRootImpl.java

@@ -2845,7 +2845,10 @@ public final class ViewRootImpl implements ViewParent,
                 if (mSurfaceControl.isValid()) {
                     updateOpacity(mWindowAttributes, dragResizing,
                             surfaceControlChanged /*forceUpdate */);
-                    if (surfaceControlChanged) {
+                    // No need to updateDisplayDecoration if it's a new SurfaceControl and
+                    // mDisplayDecorationCached is false, since that's the default for a new
+                    // SurfaceControl.
+                    if (surfaceControlChanged && mDisplayDecorationCached) {
                         updateDisplayDecoration();
                     }
                 }