Schedule bitmap animation timers on the compositor task runner.

third_party/WebKit/Source/core/css/CSSImageValue.cpp

Index: third_party/WebKit/Source/core/css/CSSImageValue.cpp
diff --git a/third_party/WebKit/Source/core/css/CSSImageValue.cpp b/third_party/WebKit/Source/core/css/CSSImageValue.cpp
index be304a481be2bf462db677ed3a1749a2f793a5c5..10f88c008e1a77a190f00677769f56194af7a5a7 100644
--- a/third_party/WebKit/Source/core/css/CSSImageValue.cpp
+++ b/third_party/WebKit/Source/core/css/CSSImageValue.cpp
@@ -22,6 +22,7 @@
 
 #include "core/css/CSSMarkup.h"
 #include "core/dom/Document.h"
+#include "core/dom/TaskRunnerHelper.h"
 #include "core/frame/Settings.h"
 #include "core/loader/resource/ImageResourceContent.h"
 #include "core/style/StyleFetchedImage.h"
@@ -72,8 +73,10 @@ StyleImage* CSSImageValue::CacheImage(const Document& document,
         document.GetSettings()->GetFetchImagePlaceholders())
       params.SetAllowImagePlaceholder();
 
-    if (ImageResourceContent* cached_image =
-            ImageResourceContent::Fetch(params, document.Fetcher())) {
+    RefPtr<WebTaskRunner> task_runner = TaskRunnerHelper::Get(
+        TaskType::kAnimationTimer, const_cast<Document*>(&document));

[Dan Elphick, 2017/04/27 14:41:39]

more const_cast here:(

+    if (ImageResourceContent* cached_image = ImageResourceContent::Fetch(
+            task_runner, params, document.Fetcher())) {
       cached_image_ =
           StyleFetchedImage::Create(cached_image, document, params.Url());
     } else {