Pass device scale factor from display to ws.

services/ui/ws/platform_display_delegate.h

Index: services/ui/ws/platform_display_delegate.h
diff --git a/services/ui/ws/platform_display_delegate.h b/services/ui/ws/platform_display_delegate.h
index 7daf17da384388c6c2d3dfd05f2b95349ece3cfb..40b49c85709c66c552923210916ce11e99478cb2 100644
--- a/services/ui/ws/platform_display_delegate.h
+++ b/services/ui/ws/platform_display_delegate.h
@@ -7,6 +7,10 @@
 
 #include "services/ui/ws/ids.h"
 
+namespace gfx {
+class Size;
+}
+
 namespace ui {

[rjkroege, 2016/09/23 13:56:23]

nit: why two namespace ui?

[kylechar, 2016/09/23 14:22:28]

Probably something like "s/namespace mus/namespace ui/" cause it? Fixed.

 class Event;
 }
@@ -23,6 +27,10 @@ struct ViewportMetrics;
 /// and responses to changes in viewport size.
 class PlatformDisplayDelegate {
  public:
+  // Creates the root window for this display. The new root window will have
+  // |size| in DIP initially.
+  virtual void CreateRootWindow(const gfx::Size& size) = 0;
+
   // Returns the root window of this display.
   virtual ServerWindow* GetRootWindow() = 0;