Schedule bitmap animation timers on the compositor task runner.

third_party/WebKit/Source/core/loader/EmptyClients.cpp

Index: third_party/WebKit/Source/core/loader/EmptyClients.cpp
diff --git a/third_party/WebKit/Source/core/loader/EmptyClients.cpp b/third_party/WebKit/Source/core/loader/EmptyClients.cpp
index d7a2fff2a94a4a391f7bda53541ee8f08f2a5350..b6e151267c6e8cbb4840d6fa9883eeca730a77ee 100644
--- a/third_party/WebKit/Source/core/loader/EmptyClients.cpp
+++ b/third_party/WebKit/Source/core/loader/EmptyClients.cpp
@@ -77,6 +77,7 @@ class EmptyFrameScheduler : public WebFrameScheduler {
   RefPtr<WebTaskRunner> TimerTaskRunner() override;
   RefPtr<WebTaskRunner> UnthrottledTaskRunner() override;
   RefPtr<WebTaskRunner> SuspendableTaskRunner() override;
+  RefPtr<WebTaskRunner> CompositorTaskRunner() override;
 };
 
 RefPtr<WebTaskRunner> EmptyFrameScheduler::LoadingTaskRunner() {
@@ -95,6 +96,10 @@ RefPtr<WebTaskRunner> EmptyFrameScheduler::SuspendableTaskRunner() {
   return Platform::Current()->MainThread()->GetWebTaskRunner();
 }
 
+RefPtr<WebTaskRunner> EmptyFrameScheduler::CompositorTaskRunner() {
+  return Platform::Current()->MainThread()->GetWebTaskRunner();
+}
+
 PopupMenu* EmptyChromeClient::OpenPopupMenu(LocalFrame&, HTMLSelectElement&) {
   return new EmptyPopupMenu();
 }