Make Keyframe use TimeTicks/TimeDelta to represent time instead of double.

ui/compositor/transform_animation_curve_adapter.h

Index: ui/compositor/transform_animation_curve_adapter.h
diff --git a/ui/compositor/transform_animation_curve_adapter.h b/ui/compositor/transform_animation_curve_adapter.h
index c08024dd3aaef3e223f3b4a4b587dc226c44cc39..5bbe6a3160f6036c8abebfab6492d96f99459655 100644
--- a/ui/compositor/transform_animation_curve_adapter.h
+++ b/ui/compositor/transform_animation_curve_adapter.h
@@ -27,7 +27,7 @@ class COMPOSITOR_EXPORT TransformAnimationCurveAdapter
   // TransformAnimationCurve implementation.
   base::TimeDelta Duration() const override;
   scoped_ptr<AnimationCurve> Clone() const override;
-  gfx::Transform GetValue(double t) const override;
+  gfx::Transform GetValue(base::TimeDelta t) const override;
   bool AnimatedBoundsForBox(const gfx::BoxF& box,
                             gfx::BoxF* bounds) const override;
   bool AffectsScale() const override;
@@ -57,7 +57,7 @@ class COMPOSITOR_EXPORT InverseTransformCurveAdapter
 
   base::TimeDelta Duration() const override;
   scoped_ptr<AnimationCurve> Clone() const override;
-  gfx::Transform GetValue(double t) const override;
+  gfx::Transform GetValue(base::TimeDelta t) const override;
   bool AnimatedBoundsForBox(const gfx::BoxF& box,
                             gfx::BoxF* bounds) const override;
   bool AffectsScale() const override;