Update from https://crrev.com/305340

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/geometry/size.h"
+#include "ui/gfx/geometry/vector2d.h"
 #include "ui/gfx/geometry/vector2d_f.h"
 
 namespace cc {
 
 class TimingFunction;
 
+// Used in the CC to pass around a scale animation that hasn't yet been
+// initialized.
+struct PendingPageScaleAnimation {
+  PendingPageScaleAnimation(
+      const gfx::Vector2d _target_offset,
+      bool _use_anchor,
+      float _scale,
+      const base::TimeDelta& _duration)
+      : target_offset(_target_offset),
+        use_anchor(_use_anchor),
+        scale(_scale),
+        duration(_duration) {}
+  gfx::Vector2d target_offset;
+  bool use_anchor;
+  float scale;
+  base::TimeDelta duration;
+};
+
 // 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 CC_EXPORT PageScaleAnimation {
  public:
@@ skipping 78 matching lines @@
   base::TimeDelta duration_;
 
   scoped_ptr<TimingFunction> timing_function_;
 
   DISALLOW_COPY_AND_ASSIGN(PageScaleAnimation);
 };
 
 }  // namespace cc
 
 #endif  // CC_INPUT_PAGE_SCALE_ANIMATION_H_