Prepare PepperWidget and RenderWidget for WebKit threaded compositing changes.

content/renderer/render_widget_fullscreen_pepper.cc

Index: content/renderer/render_widget_fullscreen_pepper.cc
diff --git a/content/renderer/render_widget_fullscreen_pepper.cc b/content/renderer/render_widget_fullscreen_pepper.cc
index 30a5380127d251b83e3028d5838e276943732f07..11d7a5c3661d71d04755679a571b8a39e54af654 100644
--- a/content/renderer/render_widget_fullscreen_pepper.cc
+++ b/content/renderer/render_widget_fullscreen_pepper.cc
@@ -59,8 +59,13 @@ class PepperWidget : public WebWidget {
     widget_->Invalidate();
   }
 
+#ifndef WEBWIDGET_HAS_ANIMATE_CHANGES
   virtual void animate() {
   }
+#else
+  virtual void animate(double frameBeginTime) {
+  }
+#endif
 
   virtual void layout() {
   }