Use ParentFrameTaskRunners for encodeImageOnEncoderThread

third_party/WebKit/Source/core/workers/ParentFrameTaskRunners.h

Index: third_party/WebKit/Source/core/workers/ParentFrameTaskRunners.h
diff --git a/third_party/WebKit/Source/core/workers/ParentFrameTaskRunners.h b/third_party/WebKit/Source/core/workers/ParentFrameTaskRunners.h
index 5c105eb3cc4c1cfd42f9bb020694098ea576ec73..bb4cecab5b107085048cc157c7f9bd19283856c7 100644
--- a/third_party/WebKit/Source/core/workers/ParentFrameTaskRunners.h
+++ b/third_party/WebKit/Source/core/workers/ParentFrameTaskRunners.h
@@ -31,9 +31,10 @@ class CORE_EXPORT ParentFrameTaskRunners final : public GarbageCollectedFinalize
     WTF_MAKE_NONCOPYABLE(ParentFrameTaskRunners);
 
 public:
-    // LocalFrame could be nullptr if the worker is not associated with a
-    // particular local frame.
-    explicit ParentFrameTaskRunners(LocalFrame*);
+    static ParentFrameTaskRunners* create(LocalFrame* frame)
+    {
+        return new ParentFrameTaskRunners(frame);
+    }
 
     // Might return nullptr for unsupported task types.
     WebTaskRunner* get(TaskType);
@@ -43,6 +44,10 @@ public:
 private:
     using TaskRunnerHashMap = HashMap<TaskType, WebTaskRunner*, WTF::IntHash<TaskType>, TaskTypeTraits>;
 
+    // LocalFrame could be nullptr if the worker is not associated with a
+    // particular local frame.
+    explicit ParentFrameTaskRunners(LocalFrame*);
+
     void contextDestroyed() override;
 
     Mutex m_taskRunnersMutex;