Changing animate to beginFrame and use struct rather than naked double to allow extension.

Source/platform/exported/WebActiveGestureAnimation.cpp

Index: Source/platform/exported/WebActiveGestureAnimation.cpp
diff --git a/Source/platform/exported/WebActiveGestureAnimation.cpp b/Source/platform/exported/WebActiveGestureAnimation.cpp
index f0a5eb6c0661d6573b51a06b468c1297d2d8fdeb..e5fc61345bd23c9caf3db2e1a035e5547c53821b 100644
--- a/Source/platform/exported/WebActiveGestureAnimation.cpp
+++ b/Source/platform/exported/WebActiveGestureAnimation.cpp
@@ -53,8 +53,9 @@ WebActiveGestureAnimation::WebActiveGestureAnimation(PassOwnPtr<WebGestureCurve>
 {
 }
 
-bool WebActiveGestureAnimation::animate(double time)
+bool WebActiveGestureAnimation::animate(WebFrameTime frameTime)
 {
+    double time = frameTime.displayFrameTime;
     if (m_waitingForFirstTick) {
         m_startTime = time;
         m_waitingForFirstTick = false;