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

Source/web/WebViewImpl.cpp

Index: Source/web/WebViewImpl.cpp
diff --git a/Source/web/WebViewImpl.cpp b/Source/web/WebViewImpl.cpp
index bcb4ac1e0ca3a636a7c01a796c221ed69ccdfba0..3e8c16940f052d4c18cba967a7e175ecfb461bbc 100644
--- a/Source/web/WebViewImpl.cpp
+++ b/Source/web/WebViewImpl.cpp
@@ -119,6 +119,7 @@
 #include "public/web/WebAXObject.h"
 #include "public/web/WebActiveWheelFlingParameters.h"
 #include "public/web/WebAutofillClient.h"
+#include "public/web/WebBeginFrameArgs.h"
 #include "public/web/WebFrameClient.h"
 #include "public/web/WebHitTestResult.h"
 #include "public/web/WebInputElement.h"
@@ -1700,16 +1701,13 @@ void WebViewImpl::didExitFullScreen()
     m_fullscreenController->didExitFullScreen();
 }
 
-void WebViewImpl::animate(double monotonicFrameBeginTime)
+void WebViewImpl::beginFrame(const WebBeginFrameArgs frameTime)
 {
-    TRACE_EVENT0("blink", "WebViewImpl::animate");
-
-    if (!monotonicFrameBeginTime)
-        monotonicFrameBeginTime = monotonicallyIncreasingTime();
+    TRACE_EVENT0("blink", "WebViewImpl::beginFrame");
 
     // Create synthetic wheel events as necessary for fling.
     if (m_gestureAnimation) {
-        if (m_gestureAnimation->animate(monotonicFrameBeginTime))
+        if (m_gestureAnimation->animate(frameTime.lastFrameTime))
             scheduleAnimation();
         else {
             endActiveFlingAnimation();
@@ -1726,7 +1724,7 @@ void WebViewImpl::animate(double monotonicFrameBeginTime)
     if (!m_page)
         return;
 
-    PageWidgetDelegate::animate(m_page.get(), monotonicFrameBeginTime);
+    PageWidgetDelegate::animate(m_page.get(), frameTime.lastFrameTime);
 
     if (m_continuousPaintingEnabled) {
         ContinuousPainter::setNeedsDisplayRecursive(m_rootGraphicsLayer, m_pageOverlays.get());