cc: Clean up PageScaleAnimation for readability.

cc/page_scale_animation.h

 // Copyright 2011 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 CC_PAGE_SCALE_ANIMATION_H_
 #define CC_PAGE_SCALE_ANIMATION_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "ui/gfx/size.h"
 #include "ui/gfx/vector2d_f.h"
@@ skipping 40 matching lines @@
     const gfx::Vector2dF& targetScrollOffset() const { return m_targetScrollOffset; }
     float targetPageScaleFactor() const { return m_targetPageScaleFactor; }
 
 protected:
     PageScaleAnimation(const gfx::Vector2dF& startScrollOffset, float startPageScaleFactor, const gfx::SizeF& viewportSize, const gfx::SizeF& rootLayerSize, double startTime);
 
 private:
     void clampTargetScrollOffset();
     void inferTargetScrollOffsetFromStartAnchor();
     void inferTargetAnchorFromScrollOffsets();
-    gfx::SizeF viewportSizeAtScale(float pageScaleFactor) const;
 
+    gfx::SizeF startViewportSize() const;
+    gfx::SizeF targetViewportSize() const;
     float interpAtTime(double time) const;
+    gfx::SizeF viewportSizeAt(float interp) const;
     gfx::Vector2dF scrollOffsetAt(float interp) const;
     gfx::Vector2dF anchorAt(float interp) const;
     gfx::Vector2dF viewportRelativeAnchorAt(float interp) const;
     float pageScaleFactorAt(float interp) const;
 
     float m_startPageScaleFactor;
     float m_targetPageScaleFactor;
     gfx::Vector2dF m_startScrollOffset;
     gfx::Vector2dF m_targetScrollOffset;
 
     gfx::Vector2dF m_startAnchor;
     gfx::Vector2dF m_targetAnchor;
 
     gfx::SizeF m_viewportSize;
     gfx::SizeF m_rootLayerSize;
 
     double m_startTime;
     double m_duration;
 };
 
 }  // namespace cc
 
 #endif  // CC_PAGE_SCALE_ANIMATION_H_