Account for failure of coordinate space transformations in browser

content/browser/renderer_host/render_widget_host_view_mac.mm

Index: content/browser/renderer_host/render_widget_host_view_mac.mm
diff --git a/content/browser/renderer_host/render_widget_host_view_mac.mm b/content/browser/renderer_host/render_widget_host_view_mac.mm
index 54a4b4a939ccd31b269864a309bc25dfa4988fff..ff4d50fc1a755720dea34bb841a7d9e28bba64d2 100644
--- a/content/browser/renderer_host/render_widget_host_view_mac.mm
+++ b/content/browser/renderer_host/render_widget_host_view_mac.mm
@@ -1559,27 +1559,31 @@ void RenderWidgetHostViewMac::ProcessGestureEvent(
   render_widget_host_->ForwardGestureEventWithLatencyInfo(event, latency);
 }
 
-gfx::Point RenderWidgetHostViewMac::TransformPointToLocalCoordSpace(
+bool RenderWidgetHostViewMac::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.
   float scale_factor = display::Screen::GetScreen()
                            ->GetDisplayNearestWindow(cocoa_view_)
                            .device_scale_factor();
   gfx::Point point_in_pixels = gfx::ConvertPointToPixel(scale_factor, point);
-  transformed_point =
-      browser_compositor_->GetDelegatedFrameHost()
-          ->TransformPointToLocalCoordSpace(point_in_pixels, original_surface);
-  return gfx::ConvertPointToDIP(scale_factor, transformed_point);
+  if (!browser_compositor_->GetDelegatedFrameHost()
+           ->TransformPointToLocalCoordSpace(point_in_pixels, original_surface,
+                                             transformed_point))
+    return false;
+  *transformed_point = gfx::ConvertPointToDIP(scale_factor, *transformed_point);
+  return true;
 }
 
-gfx::Point RenderWidgetHostViewMac::TransformPointToCoordSpaceForView(
+bool RenderWidgetHostViewMac::TransformPointToCoordSpaceForView(
     const gfx::Point& point,
-    RenderWidgetHostViewBase* target_view) {
+    RenderWidgetHostViewBase* target_view,
+    gfx::Point* transformed_point) {
   return browser_compositor_->GetDelegatedFrameHost()
-      ->TransformPointToCoordSpaceForView(point, target_view);
+      ->TransformPointToCoordSpaceForView(point, target_view,
+                                          transformed_point);
 }
 
 bool RenderWidgetHostViewMac::Send(IPC::Message* message) {