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 f957933fa3ebf8204879497ef47b9c1423800640..c0547afc6745947003606d3e3200057df131bfe7 100644
--- a/Source/web/WebPagePopupImpl.cpp
+++ b/Source/web/WebPagePopupImpl.cpp
@@ -288,9 +288,9 @@ WebSize WebPagePopupImpl::size()
     return m_popupClient->contentSize();
 }
 
-void WebPagePopupImpl::animate(double)
+void WebPagePopupImpl::animate(WebFrameTime frameTime)
 {
-    PageWidgetDelegate::animate(m_page.get(), monotonicallyIncreasingTime());
+    PageWidgetDelegate::animate(m_page.get(), frameTime);
 }
 
 void WebPagePopupImpl::willCloseLayerTreeView()