Bug 827836 - Force sending a viewport update to Gecko after aborting animations. r=Cwiiis

mobile/android/base/gfx/GeckoLayerClient.java

@@ -477,9 +477,9 @@ public class GeckoLayerClient implements LayerView.Listener, PanZoomTarget
             // At this point, we have just switched to displaying a different document than we
             // we previously displaying. This means we need to abort any panning/zooming animations
             // that are in progress and send an updated display port request to browser.js as soon
-            // as possible. We accomplish this by passing true to abortPanZoomAnimation, which
-            // sends the request after aborting the animation. The display port request is actually
-            // a full viewport update, which is fine because if browser.js has somehow moved to
+            // as possible. The call to PanZoomController.abortAnimation accomplishes this by calling the
+            // setForceRedraw function, which sends the viewport to gecko. The display port request is
+            // actually a full viewport update, which is fine because if browser.js has somehow moved to
             // be out of sync with this first-paint viewport, then we force them back in sync.
             abortPanZoomAnimation();
 

mobile/android/base/ui/PanZoomController.java

@@ -226,6 +226,7 @@ public class PanZoomController
             // transitions.
             synchronized (mTarget.getLock()) {
                 mTarget.setViewportMetrics(getValidViewportMetrics());
+                mTarget.setForceRedraw();
             }
             break;
         }