Expose different task runner in RenderFrame for convenience

content/public/renderer/render_frame.h

Index: content/public/renderer/render_frame.h
diff --git a/content/public/renderer/render_frame.h b/content/public/renderer/render_frame.h
index b0211bf64e365cb7b4a7e9eab0bdfbc317ef89a3..bccf9041f7d302d78b72ce928d3b6d84b2edc36a 100644
--- a/content/public/renderer/render_frame.h
+++ b/content/public/renderer/render_frame.h
@@ -20,6 +20,10 @@
 #include "third_party/WebKit/public/platform/WebPageVisibilityState.h"
 #include "third_party/WebKit/public/web/WebNavigationPolicy.h"
 
+namespace base {
+class SingleThreadTaskRunner;
+}
+
 namespace blink {
 class WebFrame;
 class WebLocalFrame;
@@ -244,6 +248,12 @@ class CONTENT_EXPORT RenderFrame : public IPC::Listener,
   // requests navigation until the browser responds with the result.
   virtual bool IsBrowserSideNavigationPending() = 0;
 
+  // Renderer scheduler frame-specific task queues handles.
+  // See third_party/WebKit/Source/platform/WebFrameScheduler.h for details.
+  virtual base::SingleThreadTaskRunner* GetTimerTaskRunner() = 0;
+  virtual base::SingleThreadTaskRunner* GetLoadingTaskRunner() = 0;
+  virtual base::SingleThreadTaskRunner* GetUnthrottledTaskRunner() = 0;
+
  protected:
   ~RenderFrame() override {}