Schedule bitmap animation timers on the compositor task runner.

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

Index: third_party/WebKit/Source/core/loader/DocumentLoader.cpp
diff --git a/third_party/WebKit/Source/core/loader/DocumentLoader.cpp b/third_party/WebKit/Source/core/loader/DocumentLoader.cpp
index df7566763b1ddfeb3c30926e2d13de0c4b974e87..64ae1d23967f12ed59a83f478903b72d9fc6309d 100644
--- a/third_party/WebKit/Source/core/loader/DocumentLoader.cpp
+++ b/third_party/WebKit/Source/core/loader/DocumentLoader.cpp
@@ -32,6 +32,7 @@
 #include <memory>
 #include "core/dom/Document.h"
 #include "core/dom/DocumentParser.h"
+#include "core/dom/TaskRunnerHelper.h"
 #include "core/dom/WeakIdentifierMap.h"
 #include "core/events/Event.h"
 #include "core/frame/Deprecation.h"
@@ -185,13 +186,15 @@ Resource* DocumentLoader::StartPreload(Resource::Type type,
                                        FetchParameters& params) {
   Resource* resource = nullptr;
   switch (type) {
-    case Resource::kImage:
+    case Resource::kImage: {
       if (frame_ && frame_->GetSettings() &&
           frame_->GetSettings()->GetFetchImagePlaceholders()) {
         params.SetAllowImagePlaceholder();
       }
-      resource = ImageResource::Fetch(params, Fetcher());
-      break;
+      RefPtr<WebTaskRunner> task_runner =
+          TaskRunnerHelper::Get(TaskType::kAnimationTimer, frame_);
+      resource = ImageResource::Fetch(task_runner, params, Fetcher());
+    } break;
     case Resource::kScript:
       resource = ScriptResource::Fetch(params, Fetcher());
       break;