Animations: Introduce compositor AnimationPlayer and AnimationTimeline.

Source/web/ChromeClientImpl.cpp

Index: Source/web/ChromeClientImpl.cpp
diff --git a/Source/web/ChromeClientImpl.cpp b/Source/web/ChromeClientImpl.cpp
index 98377cec588585c34a4b2762d7e0ef5df5921c5c..8200bb4b80a3065bb92f10d277db21511c119511 100644
--- a/Source/web/ChromeClientImpl.cpp
+++ b/Source/web/ChromeClientImpl.cpp
@@ -34,6 +34,7 @@
 
 #include "bindings/core/v8/ScriptController.h"
 #include "core/HTMLNames.h"
+#include "core/animation/AnimationTimeline.h"
 #include "core/dom/AXObjectCache.h"
 #include "core/dom/Document.h"
 #include "core/dom/Fullscreen.h"
@@ -107,6 +108,8 @@
 
 namespace blink {
 
+class WebCompositorAnimationTimeline;
+
 // Converts a AXObjectCache::AXNotification to a WebAXEvent
 static WebAXEvent toWebAXEvent(AXObjectCache::AXNotification notification)
 {
@@ -691,19 +694,24 @@ GraphicsLayerFactory* ChromeClientImpl::graphicsLayerFactory() const
 
 void ChromeClientImpl::attachRootGraphicsLayer(GraphicsLayer* rootLayer, LocalFrame* localRoot)
 {
+    WebCompositorAnimationTimeline* compositorTimeline = rootLayer && localRoot->document() ? localRoot->document()->timeline().compositorTimeline() : nullptr;
+
     // FIXME: For top-level frames we still use the WebView as a WebWidget. This special
     // case will be removed when top-level frames get WebFrameWidgets.
     if (localRoot->isMainFrame()) {
+        m_webView->setCompositorAnimationTimeline(compositorTimeline);
         m_webView->setRootGraphicsLayer(rootLayer);
     } else {
         WebLocalFrameImpl* webFrame = WebLocalFrameImpl::fromFrame(localRoot);
         // FIXME: The following conditional is only needed for staging until the Chromium patch
         // lands that instantiates a WebFrameWidget.
         if (!webFrame->frameWidget()) {
+            m_webView->setCompositorAnimationTimeline(compositorTimeline);
             m_webView->setRootGraphicsLayer(rootLayer);
             return;
         }
         ASSERT(webFrame && webFrame->frameWidget());
+        webFrame->frameWidget()->setCompositorAnimationTimeline(compositorTimeline);
         webFrame->frameWidget()->setRootGraphicsLayer(rootLayer);
     }
 }