Move page scale animation from LayerTreeHostImpl to LayerTreeImpl

cc/input/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_INPUT_PAGE_SCALE_ANIMATION_H_
 #define CC_INPUT_PAGE_SCALE_ANIMATION_H_
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/time/time.h"
+#include "cc/base/cc_export.h"
 #include "ui/gfx/size.h"
 #include "ui/gfx/vector2d_f.h"
 
 namespace cc {
 
 class TimingFunction;
 
 // A small helper class that does the math for zoom animations, primarily for
 // double-tap zoom. Initialize it with starting and ending scroll/page scale
 // positions and an animation length time, then call ...AtTime() at every frame
 // to obtain the current interpolated position. The supplied timing function
 // is used to ease the animation.
 //
 // All sizes and vectors in this class's public methods are in the root scroll
 // layer's coordinate space.
-class PageScaleAnimation {
+class CC_EXPORT PageScaleAnimation {
  public:
   // Construct with the state at the beginning of the animation.
   static scoped_ptr<PageScaleAnimation> Create(
       const gfx::Vector2dF& start_scroll_offset,
       float start_page_scale_factor,
       const gfx::SizeF& viewport_size,
       const gfx::SizeF& root_layer_size,
       scoped_ptr<TimingFunction> timing_function);
 
   ~PageScaleAnimation();
@@ skipping 69 matching lines @@
   base::TimeDelta duration_;
 
   scoped_ptr<TimingFunction> timing_function_;
 
   DISALLOW_COPY_AND_ASSIGN(PageScaleAnimation);
 };
 
 }  // namespace cc
 
 #endif  // CC_INPUT_PAGE_SCALE_ANIMATION_H_