Revert of RenderWidgetCompositor should be decoupled from RenderWidget.

content/renderer/gpu/render_widget_compositor_delegate.h

-// Copyright 2015 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_RENDERER_GPU_RENDER_WIDGET_COMPOSITOR_DELEGATE_H_
-#define CONTENT_RENDERER_GPU_RENDER_WIDGET_COMPOSITOR_DELEGATE_H_
-
-#include "cc/debug/frame_timing_tracker.h"
-
-namespace blink {
-class WebWidget;
-struct WebScreenInfo;
-}
-
-namespace cc {
-class BeginFrameSource;
-class OutputSurface;
-}
-
-namespace content {
-
-// Consumers of RenderWidgetCompositor implement this delegate in order to
-// transport compositing information across processes.
-class CONTENT_EXPORT RenderWidgetCompositorDelegate {
- public:
-  // Report viewport related properties during a commit from the compositor
-  // thread.
-  virtual void ApplyViewportDeltas(
-      const gfx::Vector2dF& inner_delta,
-      const gfx::Vector2dF& outer_delta,
-      const gfx::Vector2dF& elastic_overscroll_delta,
-      float page_scale,
-      float top_controls_delta) = 0;
-
-  // Notifies that the compositor has issed a BeginMainFrame.
-  virtual void BeginMainFrame(double frame_time_sec) = 0;
-
-  // Requests an OutputSurface to render into.
-  virtual scoped_ptr<cc::OutputSurface> CreateOutputSurface(bool fallback) = 0;
-
-  // Requests an external BeginFrameSource from the delegate.
-  virtual scoped_ptr<cc::BeginFrameSource> CreateExternalBeginFrameSource() = 0;
-
-  // Notifies that the draw commands for a committed frame have been issued.
-  virtual void DidCommitAndDrawCompositorFrame() = 0;
-
-  // Notifies about a compositor frame commit operation having finished.
-  virtual void DidCommitCompositorFrame() = 0;
-
-  // Called by the compositor when page scale animation completed.
-  virtual void DidCompletePageScaleAnimation() = 0;
-
-  // Notifies that the compositor has posted a swapbuffers operation to the GPU
-  // process.
-  virtual void DidCompleteSwapBuffers() = 0;
-
-  // TODO(simonhong, fsamuel): Remove this once crbug.com/471411 is resolved.
-  // Indicates whether this RenderWidgetCompositor is for an out-of-process
-  // iframe or not.
-  virtual bool ForOOPIF() const = 0;
-
-  // Called by the compositor to forward a proto that represents serialized
-  // compositor state.
-  virtual void ForwardCompositorProto(const std::vector<uint8_t>& proto) = 0;
-
-  // Called by the compositor in single-threaded mode when a swap is aborted.
-  virtual void OnSwapBuffersAborted() = 0;
-
-  // Called by the compositor in single-threaded mode when a swap completes.
-  virtual void OnSwapBuffersComplete() = 0;
-
-  // Called by the compositor in single-threaded mode when a swap is posted.
-  virtual void OnSwapBuffersPosted() = 0;
-
-  // Called by the compositor to request the delegate to record frame timing.
-  virtual void RecordFrameTimingEvents(
-      scoped_ptr<cc::FrameTimingTracker::CompositeTimingSet> composite_events,
-      scoped_ptr<cc::FrameTimingTracker::MainFrameTimingSet>
-          main_frame_events) = 0;
-
-  // Requests that the client schedule a composite now, and calculate
-  // appropriate delay for potential future frame.
-  virtual void ScheduleAnimation() = 0;
-
-  // Requests a visual frame-based update to the state of the delegate if there
-  // an update available.
-  virtual void UpdateVisualState() = 0;
-
-  // Indicates that the compositor is about to begin a frame. This is primarily
-  // to signal to flow control mechanisms that a frame is beginning, not to
-  // perform actual painting work.
-  virtual void WillBeginCompositorFrame() = 0;
-
- protected:
-  virtual ~RenderWidgetCompositorDelegate() {}
-};
-
-}  // namespace content
-
-#endif  // CONTENT_RENDERER_GPU_RENDER_WIDGET_COMPOSITOR_DELEGATE_H_