CC Animations: Establish AnimationHost, AnimationTimeline and AnimationPlayer

content/renderer/gpu/render_widget_compositor.cc

Index: content/renderer/gpu/render_widget_compositor.cc
diff --git a/content/renderer/gpu/render_widget_compositor.cc b/content/renderer/gpu/render_widget_compositor.cc
index af9edfc758c46c257a74552ab198abcbc3d8aa16..7fc8c4ef67fd48378a98b0fe6331d33989488172 100644
--- a/content/renderer/gpu/render_widget_compositor.cc
+++ b/content/renderer/gpu/render_widget_compositor.cc
@@ -14,10 +14,12 @@
 #include "base/sys_info.h"
 #include "base/time/time.h"
 #include "base/values.h"
+#include "cc/animation/animation_timeline.h"
 #include "cc/base/latency_info_swap_promise.h"
 #include "cc/base/latency_info_swap_promise_monitor.h"
 #include "cc/base/swap_promise.h"
 #include "cc/base/switches.h"
+#include "cc/blink/web_compositor_animation_timeline_impl.h"
 #include "cc/blink/web_layer_impl.h"
 #include "cc/debug/layer_tree_debug_state.h"
 #include "cc/debug/micro_benchmark.h"
@@ -566,6 +568,15 @@ void RenderWidgetCompositor::clearRootLayer() {
   layer_tree_host_->SetRootLayer(scoped_refptr<cc::Layer>());
 }
 
+void RenderWidgetCompositor::setCompositorAnimationTimeline(
+    blink::WebCompositorAnimationTimeline* compositor_timeline) {
+  layer_tree_host_->SetAnimationTimeline(
+      compositor_timeline
+          ? static_cast<const cc_blink::WebCompositorAnimationTimelineImpl*>(
+                compositor_timeline)->animation_timeline()
+          : scoped_refptr<cc::AnimationTimeline>());
+}
+
 void RenderWidgetCompositor::setViewportSize(
     const WebSize&,
     const WebSize& device_viewport_size) {