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..65aa28d93257094f2220b9d33359c2b130a2c552 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::animate(WebFrameTime frameTime)
 {
-    PageWidgetDelegate::animate(m_page.get(), monotonicallyIncreasingTime());
+    PageWidgetDelegate::animate(m_page.get(), frameTime);
 }
 
 void WebPagePopupImpl::willCloseLayerTreeView()