Move ReferencedSurfaceTracker into GpuCompositorFrameSink.

cc/surfaces/embedded_surface_tracker.h

-// Copyright 2016 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 CC_SURFACES_EMBEDDED_SURFACE_TRACKER_H_
-#define CC_SURFACES_EMBEDDED_SURFACE_TRACKER_H_
-
-#include <unordered_map>
-#include <vector>
-
-#include "base/macros.h"
-#include "cc/surfaces/frame_sink_id.h"
-#include "cc/surfaces/surface_id.h"
-#include "cc/surfaces/surface_reference.h"
-#include "cc/surfaces/surfaces_export.h"
-
-namespace cc {
-
-namespace test {
-class EmbeddedSurfaceTrackerTest;
-}
-
-// Tracks surface references from a client surface to embedded surfaces. Handles
-// updating the references when the client surface resizes.
-class CC_SURFACES_EXPORT EmbeddedSurfaceTracker {
- public:
-  EmbeddedSurfaceTracker();
-  ~EmbeddedSurfaceTracker();
-
-  const SurfaceId& current_surface_id() const { return current_surface_id_; }
-
-  // Checks if the client has a valid SurfaceId. This will become true after
-  // SetCurrentSurfaceId() is called for the first time. No references will be
-  // added or removed until this is true.
-  bool HasValidSurfaceId() const { return current_surface_id_.is_valid(); }
-
-  // Sets |current_surface_id_| when the client switches surfaces. Clears all
-  // references waiting to be added or removed, since no CompositorFrame will be
-  // submitted for the previous surface now. Generates new references from the
-  // new surface to all embedded surfaces. Does not send IPC.
-  void SetCurrentSurfaceId(const SurfaceId& surface_id);
-
-  // Adds a reference from |current_surface_id_| to |embedded_id| and records
-  // |embedded_id|. If an existing surface with the same FrameSinkId is embedded
-  // removes the reference to it. Does not send IPC. Returns true for the first
-  // surface from a FrameSinkId and false for all subsequent surfaces.
-  bool EmbedSurface(const SurfaceId& embedded_id);
-
-  // Removes reference from |current_surface_id_| to latest embedded surface for
-  // |frame_sink_id|. Does not send IPC.
-  void UnembedSurface(const FrameSinkId& frame_sink_id);
-
-  // Returns |references_to_add_| and clears contents. It's expected this will
-  // be called immediately before submitting a CompositorFrame and caller will
-  // add references via IPC.
-  std::vector<SurfaceReference> GetReferencesToAdd();
-  bool HasReferencesToAdd() const { return !references_to_add_.empty(); }
-
-  // Returns |references_to_remove_| and clears contents. It's expected this
-  // will be called immediately after submitting a CompositorFrame and caller
-  // will remove references via IPC.
-  std::vector<SurfaceReference> GetReferencesToRemove();
-  bool HasReferencesToRemove() const { return !references_to_remove_.empty(); }
-
- private:
-  friend class test::EmbeddedSurfaceTrackerTest;
-
-  // Records adding a reference from |parent_id| to |child_id|. References are
-  // not actually added until SendAddSurfaceReferences() is called.
-  void AddReference(const SurfaceId& parent_id, const SurfaceId& child_id);
-
-  // Records removing a reference from |parent_id| to |child_id|. References
-  // are not actually removed until SendRemoveSurfaceReferences() is called.
-  void RemoveReference(const SurfaceId& parent_id, const SurfaceId& child_id);
-
-  // The id of the client surface that is embedding other surfaces.
-  SurfaceId current_surface_id_;
-
-  // Surfaces that are embedded by the client surface. A reference from
-  // |current_surface_id_| will be added if it's valid.
-  std::unordered_map<FrameSinkId, SurfaceId, FrameSinkIdHash>
-      embedded_surfaces_;
-
-  // References to surfaces that should be removed after the next
-  // CompositorFrame has been submitted and the surfaces are no longer embedded.
-  std::vector<SurfaceReference> references_to_remove_;
-
-  // References that should be added before the next CompositorFrame is
-  // submitted.
-  std::vector<SurfaceReference> references_to_add_;
-
-  DISALLOW_COPY_AND_ASSIGN(EmbeddedSurfaceTracker);
-};
-
-}  // namespace cc
-
-#endif  // CC_SURFACES_EMBEDDED_SURFACE_TRACKER_H_