Pass gfx structs by const ref (gfx::Vector2d/F)

ui/compositor/layer.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_COMPOSITOR_LAYER_H_
 #define UI_COMPOSITOR_LAYER_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 133 matching lines @@
   // Return the target transform if animator is running, or the current
   // transform otherwise.
   gfx::Transform GetTargetTransform() const;
 
   // The bounds, relative to the parent.
   void SetBounds(const gfx::Rect& bounds);
   const gfx::Rect& bounds() const { return bounds_; }
 
   // The offset from our parent (stored in bounds.origin()) is an integer but we
   // may need to be at a fractional pixel offset to align properly on screen.
-  void SetSubpixelPositionOffset(const gfx::Vector2dF offset);
+  void SetSubpixelPositionOffset(const gfx::Vector2dF& offset);
   const gfx::Vector2dF& subpixel_position_offset() const {
     return subpixel_position_offset_;
   }
 
   // Return the target bounds if animator is running, or the current bounds
   // otherwise.
   gfx::Rect GetTargetBounds() const;
 
   // Sets/gets whether or not drawing of child layers should be clipped to the
   // bounds of this layer.
@@ skipping 368 matching lines @@
   // The size of the frame or texture in DIP, set when SetShowDelegatedContent
   // or SetTextureMailbox was called.
   gfx::Size frame_size_in_dip_;
 
   DISALLOW_COPY_AND_ASSIGN(Layer);
 };
 
 }  // namespace ui
 
 #endif  // UI_COMPOSITOR_LAYER_H_