Account for failure of coordinate space transformations in browser

content/browser/frame_host/render_widget_host_view_child_frame.cc

 // 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.
 
 #include "content/browser/frame_host/render_widget_host_view_child_frame.h"
 
 #include <algorithm>
 #include <utility>
 #include <vector>
 
@@ skipping 513 matching lines @@
 
 gfx::Point RenderWidgetHostViewChildFrame::TransformPointToRootCoordSpace(
     const gfx::Point& point) {
   if (!frame_connector_)
     return point;
 
   return frame_connector_->TransformPointToRootCoordSpace(
       point, cc::SurfaceId(frame_sink_id_, local_frame_id_));
 }
 
-gfx::Point RenderWidgetHostViewChildFrame::TransformPointToLocalCoordSpace(
+bool RenderWidgetHostViewChildFrame::TransformPointToLocalCoordSpace(
     const gfx::Point& point,
-    const cc::SurfaceId& original_surface) {
+    const cc::SurfaceId& original_surface,
+    gfx::Point* transformed_point) {
+  *transformed_point = point;
   if (!frame_connector_ || local_frame_id_.is_null())
-    return point;
+    return false;
 
   return frame_connector_->TransformPointToLocalCoordSpace(
-      point, original_surface, cc::SurfaceId(frame_sink_id_, local_frame_id_));
+      point, original_surface, cc::SurfaceId(frame_sink_id_, local_frame_id_),
+      transformed_point);
 }
 
-gfx::Point RenderWidgetHostViewChildFrame::TransformPointToCoordSpaceForView(
+bool RenderWidgetHostViewChildFrame::TransformPointToCoordSpaceForView(
     const gfx::Point& point,
-    RenderWidgetHostViewBase* target_view) {
+    RenderWidgetHostViewBase* target_view,
+    gfx::Point* transformed_point) {
   if (!frame_connector_ || local_frame_id_.is_null() || target_view == this)
-    return point;
+    return false;
 
   return frame_connector_->TransformPointToCoordSpaceForView(
-      point, target_view, cc::SurfaceId(frame_sink_id_, local_frame_id_));
+      point, target_view, cc::SurfaceId(frame_sink_id_, local_frame_id_),
+      transformed_point);
 }
 
 bool RenderWidgetHostViewChildFrame::IsRenderWidgetHostViewChildFrame() {
   return true;
 }
 
 #if defined(OS_MACOSX)
 ui::AcceleratedWidgetMac*
 RenderWidgetHostViewChildFrame::GetAcceleratedWidgetMac() const {
   return nullptr;
@@ skipping 171 matching lines @@
 
 bool RenderWidgetHostViewChildFrame::IsChildFrameForTesting() const {
   return true;
 }
 
 cc::SurfaceId RenderWidgetHostViewChildFrame::SurfaceIdForTesting() const {
   return cc::SurfaceId(frame_sink_id_, local_frame_id_);
 };
 
 }  // namespace content