Adds an interface to SurfaceHittestDelegate in order to override

cc/surfaces/surface_hittest_delegate.h

Index: cc/surfaces/surface_hittest_delegate.h
diff --git a/cc/surfaces/surface_hittest_delegate.h b/cc/surfaces/surface_hittest_delegate.h
index 59095f8906c45488271747a1e022a9f68c3e4d31..f966b7c0907ed5b8bf8d017d520412939ecb74d8 100644
--- a/cc/surfaces/surface_hittest_delegate.h
+++ b/cc/surfaces/surface_hittest_delegate.h
@@ -21,6 +21,11 @@ class SurfaceHittestDelegate {
   // target.
   virtual bool RejectHitTarget(const SurfaceDrawQuad* surface_quad,
                                const gfx::Point& point_in_quad_space) = 0;
+
+  // Return true if this delegate accepts this |surface_quad| as a candidate hit
+  // target.
+  virtual bool AcceptHitTarget(const SurfaceDrawQuad* surface_quad,
+                               const gfx::Point& point_in_quad_space) = 0;
 };
 
 }  // namespace cc