Account for failure of coordinate space transformations in browser

content/browser/renderer_host/render_widget_host_view_aura.cc

 // Copyright (c) 2012 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/renderer_host/render_widget_host_view_aura.h"
 
 #include <set>
 #include <utility>
 
 #include "base/auto_reset.h"
@@ skipping 2045 matching lines @@
     const ui::LatencyInfo& latency) {
   host_->ForwardTouchEventWithLatencyInfo(event, latency);
 }
 
 void RenderWidgetHostViewAura::ProcessGestureEvent(
     const blink::WebGestureEvent& event,
     const ui::LatencyInfo& latency) {
   host_->ForwardGestureEventWithLatencyInfo(event, latency);
 }
 
-gfx::Point RenderWidgetHostViewAura::TransformPointToLocalCoordSpace(
+bool RenderWidgetHostViewAura::TransformPointToLocalCoordSpace(
     const gfx::Point& point,
-    const cc::SurfaceId& original_surface) {
-  gfx::Point transformed_point;
+    const cc::SurfaceId& original_surface,
+    gfx::Point* transformed_point) {
   // Transformations use physical pixels rather than DIP, so conversion
   // is necessary.
   gfx::Point point_in_pixels =
       gfx::ConvertPointToPixel(device_scale_factor_, point);
-  transformed_point = delegated_frame_host_->TransformPointToLocalCoordSpace(
-      point_in_pixels, original_surface);
-  return gfx::ConvertPointToDIP(device_scale_factor_, transformed_point);
+  if (!delegated_frame_host_->TransformPointToLocalCoordSpace(
+          point_in_pixels, original_surface, transformed_point))
+    return false;
+  *transformed_point =
+      gfx::ConvertPointToDIP(device_scale_factor_, *transformed_point);
+  return true;
 }
 
-gfx::Point RenderWidgetHostViewAura::TransformPointToCoordSpaceForView(
+bool RenderWidgetHostViewAura::TransformPointToCoordSpaceForView(
     const gfx::Point& point,
-    RenderWidgetHostViewBase* target_view) {
+    RenderWidgetHostViewBase* target_view,
+    gfx::Point* transformed_point) {
   // In TransformPointToLocalCoordSpace() there is a Point-to-Pixel conversion,
   // but it is not necessary here because the final target view is responsible
   // for converting before computing the final transform.
-  return delegated_frame_host_->TransformPointToCoordSpaceForView(point,
-                                                                  target_view);
+  return delegated_frame_host_->TransformPointToCoordSpaceForView(
+      point, target_view, transformed_point);
 }
 
 void RenderWidgetHostViewAura::FocusedNodeChanged(
     bool editable,
     const gfx::Rect& node_bounds_in_screen) {
 #if defined(OS_WIN)
   if (!editable && virtual_keyboard_requested_) {
     virtual_keyboard_requested_ = false;
 
     RenderViewHost* rvh = RenderViewHost::From(host_);
@@ skipping 979 matching lines @@
           ->GetTextSelection(focused_view)
           ->GetSelectedText(&selected_text)) {
     // Set the CLIPBOARD_TYPE_SELECTION to the ui::Clipboard.
     ui::ScopedClipboardWriter clipboard_writer(ui::CLIPBOARD_TYPE_SELECTION);
     clipboard_writer.WriteText(selected_text);
   }
 #endif  // defined(USE_X11) && !defined(OS_CHROMEOS)
 }
 
 }  // namespace content