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

cc/blink/web_scroll_offset_animation_curve_impl.cc

Index: cc/blink/web_scroll_offset_animation_curve_impl.cc
diff --git a/cc/blink/web_scroll_offset_animation_curve_impl.cc b/cc/blink/web_scroll_offset_animation_curve_impl.cc
index ba55d5b33bd4526c3033e2b168debd490e972d38..cef276c06b6c7e17a6b918f886bd3cac48825791 100644
--- a/cc/blink/web_scroll_offset_animation_curve_impl.cc
+++ b/cc/blink/web_scroll_offset_animation_curve_impl.cc
@@ -34,7 +34,8 @@ void WebScrollOffsetAnimationCurveImpl::setInitialValue(
 }
 
 WebFloatPoint WebScrollOffsetAnimationCurveImpl::getValue(double time) const {
-  gfx::ScrollOffset value = curve_->GetValue(time);
+  gfx::ScrollOffset value =
+      curve_->GetValue(base::TimeDelta::FromSecondsD(time));
   return WebFloatPoint(value.x(), value.y());
 }