Account for failure of coordinate space transformations in browser

content/browser/frame_host/render_widget_host_view_child_frame.h

 // Copyright 2014 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 CONTENT_BROWSER_FRAME_HOST_RENDER_WIDGET_HOST_VIEW_CHILD_FRAME_H_
 #define CONTENT_BROWSER_FRAME_HOST_RENDER_WIDGET_HOST_VIEW_CHILD_FRAME_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 115 matching lines @@
   void ProcessKeyboardEvent(const NativeWebKeyboardEvent& event) override;
   void ProcessMouseEvent(const blink::WebMouseEvent& event,
                          const ui::LatencyInfo& latency) override;
   void ProcessMouseWheelEvent(const blink::WebMouseWheelEvent& event,
                               const ui::LatencyInfo& latency) override;
   void ProcessTouchEvent(const blink::WebTouchEvent& event,
                          const ui::LatencyInfo& latency) override;
   void ProcessGestureEvent(const blink::WebGestureEvent& event,
                            const ui::LatencyInfo& latency) override;
   gfx::Point TransformPointToRootCoordSpace(const gfx::Point& point) override;
-  gfx::Point TransformPointToLocalCoordSpace(
+  bool TransformPointToLocalCoordSpace(const gfx::Point& point,
+                                       const cc::SurfaceId& original_surface,
+                                       gfx::Point* transformed_point) override;
+  bool TransformPointToCoordSpaceForView(
       const gfx::Point& point,
-      const cc::SurfaceId& original_surface) override;
-  gfx::Point TransformPointToCoordSpaceForView(
-      const gfx::Point& point,
-      RenderWidgetHostViewBase* target_view) override;
+      RenderWidgetHostViewBase* target_view,
+      gfx::Point* transformed_point) override;
 
   bool IsRenderWidgetHostViewChildFrame() override;
 
 #if defined(OS_MACOSX)
   // RenderWidgetHostView implementation.
   ui::AcceleratedWidgetMac* GetAcceleratedWidgetMac() const override;
   void SetActive(bool active) override;
   void ShowDefinitionForSelection() override;
   bool SupportsSpeech() const override;
   void SpeakSelection() override;
@@ skipping 101 matching lines @@
   // The surface client ID of the parent RenderWidgetHostView.  0 if none.
   cc::FrameSinkId parent_frame_sink_id_;
 
   base::WeakPtrFactory<RenderWidgetHostViewChildFrame> weak_factory_;
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewChildFrame);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_RENDER_WIDGET_HOST_VIEW_CHILD_FRAME_H_