cc: Don't consider HUD layer for touches

cc/layer_tree_host_common.cc

Index: cc/layer_tree_host_common.cc
diff --git a/cc/layer_tree_host_common.cc b/cc/layer_tree_host_common.cc
index 4d3377a919de45164bb5a33f7b0663b8d4397fcd..3d06aa4a12b98233ed420ff14677606e16c3c93e 100644
--- a/cc/layer_tree_host_common.cc
+++ b/cc/layer_tree_host_common.cc
@@ -7,10 +7,12 @@
 #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"
@@ -1154,6 +1156,10 @@ LayerImpl* LayerTreeHostCommon::findLayerThatIsHitByPoint(const gfx::PointF& scr
         if (pointIsClippedBySurfaceOrClipRect(screenSpacePoint, currentLayer))
             continue;
 
+        // Skip the HUD layer.
+        if (currentLayer == currentLayer->layerTreeImpl()->hud_layer())
+            continue;
+
         foundLayer = currentLayer;
         break;
     }