Have Display root ServerWindow origin be (0, 0) for all displays.

services/ui/ws/frame_generator.cc

Index: services/ui/ws/frame_generator.cc
diff --git a/services/ui/ws/frame_generator.cc b/services/ui/ws/frame_generator.cc
index c944b651785d3ece393a03cb3dd884effdb0f68e..77bab94bb67b6841943c400af7bfe4e77c2ba27d 100644
--- a/services/ui/ws/frame_generator.cc
+++ b/services/ui/ws/frame_generator.cc
@@ -70,7 +70,7 @@ void FrameGenerator::Draw() {
     return;
 
   const ViewportMetrics& metrics = delegate_->GetViewportMetrics();
-  const gfx::Rect& output_rect = metrics.bounds;
+  const gfx::Rect& output_rect(metrics.bounds.size());

[sky, 2016/08/17 18:57:54]

remove the & here.

[kylechar, 2016/08/17 19:10:01]

Oh wow, should not have missed that one. Done.

   dirty_rect_.Intersect(output_rect);
   // TODO(fsamuel): We should add a trace for generating a top level frame.
   cc::CompositorFrame frame(GenerateCompositorFrame(output_rect));