Make scroll offset type of float in cc

cc/layers/layer.h

Index: cc/layers/layer.h
diff --git a/cc/layers/layer.h b/cc/layers/layer.h
index 3452e8b157b6b63477b20ff69b27deca5f8ee018..e6283a589d1673c8cfca682f68b5769db5850652 100644
--- a/cc/layers/layer.h
+++ b/cc/layers/layer.h
@@ -261,9 +261,9 @@ class CC_EXPORT Layer : public base::RefCounted<Layer>,
     return draw_properties_.num_unclipped_descendants;
   }
 
-  void SetScrollOffset(gfx::Vector2d scroll_offset);
-  gfx::Vector2d scroll_offset() const { return scroll_offset_; }
-  void SetScrollOffsetFromImplSide(const gfx::Vector2d& scroll_offset);
+  void SetScrollOffset(gfx::Vector2dF scroll_offset);

[danakj, 2014/09/18 21:21:52]

this should be a const& while you're here

[Yufeng Shen (Slow to review), 2014/09/18 22:47:55]

Done.

+  gfx::Vector2dF scroll_offset() const { return scroll_offset_; }
+  void SetScrollOffsetFromImplSide(const gfx::Vector2dF& scroll_offset);
 
   void SetScrollClipLayerId(int clip_layer_id);
   bool scrollable() const { return scroll_clip_layer_id_ != INVALID_ID; }
@@ -584,7 +584,7 @@ class CC_EXPORT Layer : public base::RefCounted<Layer>,
   // Layer properties.
   gfx::Size bounds_;
 
-  gfx::Vector2d scroll_offset_;
+  gfx::Vector2dF scroll_offset_;
   // This variable indicates which ancestor layer (if any) whose size,
   // transformed relative to this layer, defines the maximum scroll offset for
   // this layer.