cc: Don't consider HUD layer for touches

cc/layer_tree_host_common.cc

 // Copyright 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/layer_tree_host_common.h"
 
 #include <algorithm>
 
 #include "base/debug/trace_event.h"
+#include "cc/heads_up_display_layer_impl.h"
 #include "cc/layer.h"
 #include "cc/layer_impl.h"
 #include "cc/layer_iterator.h"
 #include "cc/layer_sorter.h"
+#include "cc/layer_tree_impl.h"
 #include "cc/math_util.h"
 #include "cc/render_surface.h"
 #include "cc/render_surface_impl.h"
 #include "ui/gfx/point_conversions.h"
 #include "ui/gfx/rect_conversions.h"
 #include "ui/gfx/transform.h"
 
 namespace cc {
 
 ScrollAndScaleSet::ScrollAndScaleSet()
@@ skipping 1123 matching lines @@
         gfx::RectF contentRect(gfx::PointF(), currentLayer->contentBounds());
         if (!pointHitsRect(screenSpacePoint, currentLayer->screenSpaceTransform(), contentRect))
             continue;
 
         // At this point, we think the point does hit the layer, but we need to walk up
         // the parents to ensure that the layer was not clipped in such a way that the
         // hit point actually should not hit the layer.
         if (pointIsClippedBySurfaceOrClipRect(screenSpacePoint, currentLayer))
             continue;
 
+        // Skip the HUD layer.
+        if (currentLayer == currentLayer->layerTreeImpl()->hud_layer())
+            continue;
+
         foundLayer = currentLayer;
         break;
     }
 
     // This can potentially return 0, which means the screenSpacePoint did not successfully hit test any layers, not even the root layer.
     return foundLayer;
 }
 
 LayerImpl* LayerTreeHostCommon::findLayerThatIsHitByPointInTouchHandlerRegion(const gfx::PointF& screenSpacePoint, const std::vector<LayerImpl*>& renderSurfaceLayerList)
 {
@@ skipping 29 matching lines @@
 
   // At this point, we think the point does hit the touch event handler region on the layer, but we need to walk up
   // the parents to ensure that the layer was not clipped in such a way that the
   // hit point actually should not hit the layer.
   if (pointIsClippedBySurfaceOrClipRect(screenSpacePoint, layerImpl))
      return false;
 
   return true;
 }
 }  // namespace cc