destroyHardwareResources in onStop()

Bug: 27286867

This hopefully makes everything fully-deterministic. It should
also fix some old annoyances around Bitmap lifecycle as they will
be released earlier in onStop() instead of waiting for
dispatchDetachedFromWindow() which may never happen.

Change-Id: I6e871760650780e327c0e42f62950c1052dd8019

core/java/android/view/ViewRootImpl.java

@@ -1072,6 +1072,8 @@ public final class ViewRootImpl implements ViewParent,
             mStopped = stopped;
             if (!mStopped) {
                 scheduleTraversals();
+            } else {
+                destroyHardwareResources();
             }
         }
     }