Add DisplayScheduler for Surfaces

cc/surfaces/display_scheduler.h

Index: cc/surfaces/display_scheduler.h
diff --git a/cc/surfaces/display_scheduler.h b/cc/surfaces/display_scheduler.h
new file mode 100644
index 0000000000000000000000000000000000000000..f0310c1441f584120d2ac2df3dc2086eb4a339bc
--- /dev/null
+++ b/cc/surfaces/display_scheduler.h
@@ -0,0 +1,86 @@
+// 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 CC_SURFACES_DISPLAY_SCHEDULER_H_
+#define CC_SURFACES_DISPLAY_SCHEDULER_H_
+
+#include "base/cancelable_callback.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/single_thread_task_runner.h"
+#include "cc/scheduler/begin_frame_source.h"
+#include "cc/surfaces/surface_id.h"
+#include "cc/surfaces/surfaces_export.h"
+
+namespace cc {
+
+class OutputSurface;
+class BeginFrameSource;
+
+class CC_SURFACES_EXPORT DisplaySchedulerClient {
+ public:
+  virtual ~DisplaySchedulerClient() {}
+
+  virtual bool DrawAndSwap() = 0;
+};
+
+class CC_SURFACES_EXPORT DisplayScheduler : public BeginFrameObserverMixIn {
+ public:
+  DisplayScheduler(DisplaySchedulerClient* client,
+                   BeginFrameSource* begin_frame_source,
+                   scoped_refptr<base::SingleThreadTaskRunner> task_runner,
+                   int max_pending_swaps);
+  ~DisplayScheduler() override;
+
+  void SetResourcesLockedByBrowser(bool locked);
+  virtual void EntireDisplayDamaged();
+  virtual void SurfaceDamaged(SurfaceId surface_id);
+
+  virtual void DidSwapBuffers();

[brianderson, 2015/04/07 02:32:19]

Above tree made virtual for testing.

+  void DidSwapBuffersComplete();
+
+  void OutputSurfaceLost();
+
+  // BeginFrameObserverMixIn implementation
+  bool OnBeginFrameMixInDelegate(const BeginFrameArgs& args) override;
+
+ protected:
+  base::TimeTicks DesiredBeginFrameDeadlineTime();
+  virtual void ScheduleBeginFrameDeadline();

[brianderson, 2015/04/07 02:32:19]

Virtual for testing.

+  void OnBeginFrameDeadline();
+  void DrawAndSwap();
+
+  DisplaySchedulerClient* client_;
+  BeginFrameSource* begin_frame_source_;

[brianderson, 2015/04/07 02:32:19]

Made the BeginFrameSource always be external. This simplified testing and made
it clear in setup code what frame source is being used.

+  scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
+
+  BeginFrameArgs current_begin_frame_args_;
+  base::Closure begin_frame_deadline_closure_;
+  base::CancelableClosure begin_frame_deadline_task_;
+  base::TimeTicks begin_frame_deadline_task_time_;
+
+  bool output_surface_lost_;
+  bool resources_locked_by_browser_;
+
+  bool inside_begin_frame_deadline_interval_;
+  bool needs_draw_;
+  bool entire_display_damaged_;
+  bool all_active_surfaces_ready_to_draw_;
+
+  int pending_swaps_;
+  int max_pending_swaps_;
+
+  std::set<SurfaceId> surface_ids_damaged_;
+  std::set<SurfaceId> surface_ids_damaged_prev_;
+  std::vector<SurfaceId> surface_ids_to_expect_damage_from_;
+
+  base::WeakPtrFactory<DisplayScheduler> weak_ptr_factory_;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(DisplayScheduler);
+};
+
+}  // namespace cc
+
+#endif  // CC_SURFACES_DISPLAY_SCHEDULER_H_