Compositor Animation Timelines: Fix frame swapping tests in WebFrameTest.cpp

third_party/WebKit/Source/core/page/Page.cpp

Index: third_party/WebKit/Source/core/page/Page.cpp
diff --git a/third_party/WebKit/Source/core/page/Page.cpp b/third_party/WebKit/Source/core/page/Page.cpp
index 2377b940add2cccf43103e6a8f9599ac1b52cbfb..156f1b5c9cc7c9f31e0b75f1a0afb67db8bf2aa7 100644
--- a/third_party/WebKit/Source/core/page/Page.cpp
+++ b/third_party/WebKit/Source/core/page/Page.cpp
@@ -199,6 +199,15 @@ void Page::setMainFrame(Frame* mainFrame)
     // is called in the base constructor for both LocalFrame and RemoteFrame,
     // when the vtables for the derived classes have not yet been setup.
     m_mainFrame = mainFrame;
+
+    if (scrollingCoordinator())
+        scrollingCoordinator()->onSetMainFrame();
+}
+
+void Page::willSwapMainFrame(Frame* frame)
+{
+    if (m_scrollingCoordinator)
+        m_scrollingCoordinator->willSwapMainFrame();
 }
 
 void Page::documentDetached(Document* document)