Implement frame attribution (FrameBlamer)

components/scheduler/renderer/renderer_scheduler.h

 // Copyright 2014 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 COMPONENTS_SCHEDULER_RENDERER_RENDERER_SCHEDULER_H_
 #define COMPONENTS_SCHEDULER_RENDERER_RENDERER_SCHEDULER_H_
 
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
 #include "components/scheduler/child/child_scheduler.h"
 #include "components/scheduler/child/single_thread_idle_task_runner.h"
 #include "components/scheduler/renderer/render_widget_scheduling_state.h"
 #include "components/scheduler/scheduler_export.h"
 #include "third_party/WebKit/public/web/WebInputEvent.h"
 
+namespace base {
+namespace trace_event {
+class BlameContext;
+}
+}
+
 namespace cc {
 struct BeginFrameArgs;
 }
 
 namespace blink {
+class WebLocalFrame;
 class WebThread;
 }
 
 namespace scheduler {
 
 class RenderWidgetSchedulingState;
 
 class SCHEDULER_EXPORT RendererScheduler : public ChildScheduler {
  public:
   ~RendererScheduler() override;
@@ skipping 113 matching lines @@
   virtual void SuspendTimerQueue() = 0;
 
   // Decrements the timer queue suspension count and re-enables the timer queue
   // if the suspension count is zero and the current schduler policy allows it.
   virtual void ResumeTimerQueue() = 0;
 
   // Sets whether to allow suspension of timers after the backgrounded signal is
   // received via OnRendererBackgrounded. Defaults to disabled.
   virtual void SetTimerQueueSuspensionWhenBackgroundedEnabled(bool enabled) = 0;
 
+  // Sets the default blame context to which top level work should be
+  // attributed in this renderer. |blame_context| must outlive this scheduler.
+  virtual void SetTopLevelBlameContext(
+      base::trace_event::BlameContext* blame_context) = 0;
+
  protected:
   RendererScheduler();
   DISALLOW_COPY_AND_ASSIGN(RendererScheduler);
 };
 
 }  // namespace scheduler
 
 #endif  // COMPONENTS_SCHEDULER_RENDERER_RENDERER_SCHEDULER_H_