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

Source/web/WebPagePopupImpl.cpp

Index: Source/web/WebPagePopupImpl.cpp
diff --git a/Source/web/WebPagePopupImpl.cpp b/Source/web/WebPagePopupImpl.cpp
index e03b673c6b831fd25b73511e2f98aab0546c9905..0e505af8209fbefd47bf58b3ea66aeb83a5df85f 100644
--- a/Source/web/WebPagePopupImpl.cpp
+++ b/Source/web/WebPagePopupImpl.cpp
@@ -280,9 +280,9 @@ WebSize WebPagePopupImpl::size()
     return m_popupClient->contentSize();
 }
 
-void WebPagePopupImpl::animate(double)
+void WebPagePopupImpl::beginFrame(WebBeginFrameArgs frameTime)
 {
-    PageWidgetDelegate::animate(m_page.get(), monotonicallyIncreasingTime());
+    PageWidgetDelegate::animate(m_page.get(), frameTime.lastFrameTime);
 }
 
 void WebPagePopupImpl::willCloseLayerTreeView()