cc: Refactor content scale/bounds into draw properties

cc/layer_impl.h

Index: cc/layer_impl.h
diff --git a/cc/layer_impl.h b/cc/layer_impl.h
index 889e1e11eba85ec828d7711fe586c53fec73b724..362182eeae46fe65edaace7153599463b976d690 100644
--- a/cc/layer_impl.h
+++ b/cc/layer_impl.h
@@ -190,14 +190,13 @@ public:
     void setBounds(const gfx::Size&);
     const gfx::Size& bounds() const { return m_bounds; }
 
-    // ContentBounds may be [0, 1) pixels larger than bounds * contentsScale.
-    // Don't calculate scale from it. Use contentsScale instead for accuracy.
     void setContentBounds(const gfx::Size&);
-    gfx::Size contentBounds() const { return m_contentBounds; }
+    gfx::Size contentBounds() const { return m_drawProperties.content_bounds; }
 
-    float contentsScaleX() const { return m_contentsScaleX; }
-    float contentsScaleY() const { return m_contentsScaleY; }
+    float contentsScaleX() const { return m_drawProperties.contents_scale_x; }
+    float contentsScaleY() const { return m_drawProperties.contents_scale_y; }
     void setContentsScale(float contentsScaleX, float contentsScaleY);
+    virtual void updateContentsScale(float ideal_contents_scale) { }
 
     gfx::Vector2d scrollOffset() const { return m_scrollOffset; }
     void setScrollOffset(gfx::Vector2d);
@@ -323,9 +322,6 @@ private:
     gfx::PointF m_anchorPoint;
     float m_anchorPointZ;
     gfx::Size m_bounds;
-    gfx::Size m_contentBounds;
-    float m_contentsScaleX;
-    float m_contentsScaleY;
     gfx::Vector2d m_scrollOffset;
     bool m_scrollable;
     bool m_shouldScrollOnMainThread;