linux/x11: Fix setting window bounds in High DPI.

ui/aura/window_tree_host.h

Index: ui/aura/window_tree_host.h
diff --git a/ui/aura/window_tree_host.h b/ui/aura/window_tree_host.h
index b08391ffcf6ac3d44bdd5085c7c44b2e5699655c..0d09093bca14112928d511225b89288b22dd973c 100644
--- a/ui/aura/window_tree_host.h
+++ b/ui/aura/window_tree_host.h
@@ -129,9 +129,9 @@ class AURA_EXPORT WindowTreeHost {
   // Hides the WindowTreeHost.
   virtual void Hide() = 0;
 
-  // Gets/Sets the size of the WindowTreeHost.
+  // Gets/Sets the size of the WindowTreeHost (in pixels).
   virtual gfx::Rect GetBounds() const = 0;
-  virtual void SetBounds(const gfx::Rect& bounds) = 0;
+  virtual void SetBounds(const gfx::Rect& bounds_in_pixels) = 0;
 
   // Sets the OS capture to the root window.
   virtual void SetCapture() = 0;