Refactor browser process coordinate transformation methods

cc/surfaces/surface_hittest.h

 // Copyright 2015 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.
 
 #ifndef CC_SURFACES_SURFACE_HITTEST_H_
 #define CC_SURFACES_SURFACE_HITTEST_H_
 
 #include <set>
 
 #include "cc/surfaces/surface_id.h"
@@ skipping 26 matching lines @@
                                     const gfx::Point& point,
                                     gfx::Transform* transform);
 
   // Returns whether the target surface falls inside the provide root surface.
   // Returns the |transform| to convert points from the root surface coordinate
   // space to the target surface coordinate space.
   bool GetTransformToTargetSurface(const SurfaceId& root_surface_id,
                                    const SurfaceId& target_surface_id,
                                    gfx::Transform* transform);
 
+  // Attempts to transform a point from the coordinate space of one surface to
+  // that of another, where one is surface is embedded within the other.
+  // Returns true if the transform is successfully applied, and false if
+  // neither surface is contained with the other.
+  bool TransformPointToTargetSurface(const SurfaceId& original_surface_id,
+                                     const SurfaceId& target_surface_id,
+                                     gfx::Point* point);
+
  private:
   bool GetTargetSurfaceAtPointInternal(
       const SurfaceId& surface_id,
       const RenderPassId& render_pass_id,
       const gfx::Point& point_in_root_target,
       std::set<const RenderPass*>* referenced_passes,
       SurfaceId* out_surface_id,
       gfx::Transform* out_transform);
 
   bool GetTransformToTargetSurfaceInternal(
@@ skipping 11 matching lines @@
                    const gfx::Point& point_in_render_pass_space,
                    gfx::Transform* target_to_quad_transform,
                    gfx::Point* point_in_quad_space);
 
   SurfaceHittestDelegate* const delegate_;
   SurfaceManager* const manager_;
 };
 }  // namespace cc
 
 #endif  // CC_SURFACES_SURFACE_HITTEST_H_