Account for failure of coordinate space transformations in browser

content/browser/renderer_host/delegated_frame_host.h

Index: content/browser/renderer_host/delegated_frame_host.h
diff --git a/content/browser/renderer_host/delegated_frame_host.h b/content/browser/renderer_host/delegated_frame_host.h
index e60855b6e20831b98d10ddcbb745911493a0f5b1..8f1676e8379021e17f08c62755ff9fd6063d6ed2 100644
--- a/content/browser/renderer_host/delegated_frame_host.h
+++ b/content/browser/renderer_host/delegated_frame_host.h
@@ -163,17 +163,17 @@ class CONTENT_EXPORT DelegatedFrameHost
   // Surface, find the relative transform between the Surfaces and apply it
   // to a point. If a Surface has not yet been created this returns the
   // same point with no transform applied.

[ncarter (slow), 2016/10/13 20:34:42]

Update the comment, here and below.

[kenrb, 2016/10/14 13:02:43]

Done.

-  gfx::Point TransformPointToLocalCoordSpace(
-      const gfx::Point& point,
-      const cc::SurfaceId& original_surface);
+  bool TransformPointToLocalCoordSpace(const gfx::Point& point,
+                                       const cc::SurfaceId& original_surface,
+                                       gfx::Point* transformed_point);
 
   // Given a RenderWidgetHostViewBase that renders to a Surface that is
   // contained within this class' Surface, find the relative transform between
   // the Surfaces and apply it to a point. If a Surface has not yet been
   // created this returns the same point with no transform applied.
-  gfx::Point TransformPointToCoordSpaceForView(
-      const gfx::Point& point,
-      RenderWidgetHostViewBase* target_view);
+  bool TransformPointToCoordSpaceForView(const gfx::Point& point,
+                                         RenderWidgetHostViewBase* target_view,
+                                         gfx::Point* transformed_point);
 
   // Exposed for tests.
   cc::SurfaceId SurfaceIdForTesting() const {