Expose different task runner in RenderFrame for convenience

content/public/renderer/render_frame.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_PUBLIC_RENDERER_RENDER_FRAME_H_
 #define CONTENT_PUBLIC_RENDERER_RENDER_FRAME_H_
 
 #include <stddef.h>
 
 #include <memory>
 
 #include "base/callback_forward.h"
 #include "base/strings/string16.h"
 #include "content/common/content_export.h"
 #include "content/public/common/console_message_level.h"
 #include "content/public/common/previews_state.h"
 #include "ipc/ipc_listener.h"
 #include "ipc/ipc_sender.h"
 #include "ppapi/features/features.h"
 #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;
 class WebPlugin;
 class WebURLRequest;
 struct WebPluginParams;
 }
 
 namespace gfx {
 class Range;
@@ skipping 204 matching lines @@
   // Whether or not this frame is currently pasting.
   virtual bool IsPasting() const = 0;
 
   // Returns the current visibility of the frame.
   virtual blink::WebPageVisibilityState GetVisibilityState() const = 0;
 
   // If PlzNavigate is enabled, returns true in between teh time that Blink
   // requests navigation until the browser responds with the result.
   virtual bool IsBrowserSideNavigationPending() = 0;
 
+  virtual base::SingleThreadTaskRunner* GetTimerTaskRunner() = 0;

[jochen (gone - plz use gerrit), 2017/01/19 17:31:09]

please add comments that explain the differences, and when to use which (or
point at documentation about that)

[altimin, 2017/01/19 17:49:51]

Done.

+  virtual base::SingleThreadTaskRunner* GetLoadingTaskRunner() = 0;
+  virtual base::SingleThreadTaskRunner* GetUnthrottledTaskRunner() = 0;
+
  protected:
   ~RenderFrame() override {}
 
  private:
   // This interface should only be implemented inside content.
   friend class RenderFrameImpl;
   RenderFrame() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_RENDERER_RENDER_FRAME_H_