Update from https://crrev.com/305340

cc/input/page_scale_animation.h

Index: cc/input/page_scale_animation.h
diff --git a/cc/input/page_scale_animation.h b/cc/input/page_scale_animation.h
index ce13dcf8ba7ca650f28b7d370f3be5c6d44203b1..0e430c212fe805854be09c049170934999e8ab1c 100644
--- a/cc/input/page_scale_animation.h
+++ b/cc/input/page_scale_animation.h
@@ -10,12 +10,31 @@
 #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