Bug 704738 - Resize page content on device rotation. r=Cwiiis a=java-only

Some cleanup: ensure we abort and re-bounce the viewport
if the device is rotated during a double-tap zoom. Also
rename variables to be more appropriate

mobile/android/base/gfx/LayerController.java

@@ -258,9 +258,9 @@ public class LayerController {
     }
 
     /** Informs the pan/zoom controller that the viewport metrics changed. */
-    public void notifyPanZoomControllerOfGeometryChange(boolean abortFling) {
+    public void notifyPanZoomControllerOfGeometryChange(boolean abortAnimation) {
         if (mPanZoomController != null)
-            mPanZoomController.geometryChanged(abortFling);
+            mPanZoomController.geometryChanged(abortAnimation);
     }
 
     /**

mobile/android/base/ui/PanZoomController.java

@@ -136,8 +136,7 @@ public class PanZoomController
                          * similar to TOUCHING but after starting a pan */
         PANNING_HOLD_LOCKED, /* like PANNING_HOLD, but axis lock still in effect */
         PINCHING,       /* nth touch-start, where n > 1. this mode allows pan and zoom */
-        ANIMATED_ZOOM,  /* animated zoom to a new rect */
-        BOUNCING,       /* bouncing back */
+        ANIMATED_ZOOM   /* animated zoom to a new rect */
     }
 
     private PanZoomState mState;
@@ -241,16 +240,21 @@ public class PanZoomController
         }
     }
 
-    public void geometryChanged(boolean aAbortFling) {
-        if (aAbortFling) {
-            // this happens when gecko changes the viewport on us. if that's the case, abort
-            // any fling that's in progress and re-fling so that the page snaps to edges. for
-            // other cases (where the user's finger(s) are down) don't do anything special.
+    public void geometryChanged(boolean abortAnimation) {
+        if (abortAnimation) {
+            // this happens when gecko changes the viewport on us or if the device is rotated.
+            // if that's the case, abort any animation in progress and re-zoom so that the page
+            // snaps to edges. for other cases (where the user's finger(s) are down) don't do
+            // anything special.
             switch (mState) {
             case FLING:
                 mX.velocity = mY.velocity = 0.0f;
                 mState = PanZoomState.NOTHING;
                 // fall through
+            case ANIMATED_ZOOM:
+                // the zoom that's in progress likely makes no sense any more (such as if
+                // the screen orientation changed) so abort it and start a new one to
+                // ensure the viewport doesn't contain out-of-bounds areas
             case NOTHING:
                 bounce();
                 break;