[cc] Plumb BeginFrameAcks through SurfaceManager to DisplayScheduler.

cc/test/fake_surface_observer.h

+// Copyright 2017 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_TEST_FAKE_SURFACE_OBSERVER_H_
+#define CC_TEST_FAKE_SURFACE_OBSERVER_H_
+
+#include "base/containers/flat_set.h"
+#include "cc/output/begin_frame_args.h"
+#include "cc/surfaces/surface_id.h"
+#include "cc/surfaces/surface_info.h"
+#include "cc/surfaces/surface_observer.h"
+
+namespace cc {
+
+class FakeSurfaceObserver : public SurfaceObserver {
+ public:
+  // If |damage_display| is true, the observer will indicate display damage when
+  // a surface is damaged.
+  explicit FakeSurfaceObserver(bool damage_display = true);
+  virtual ~FakeSurfaceObserver();
+
+  const BeginFrameAck& last_ack() const { return last_ack_; }
+
+  bool IsSurfaceDamaged(const SurfaceId& surface_id) const;
+
+  const SurfaceId& last_created_surface_id() const {
+    return last_created_surface_id_;
+  }
+
+  const SurfaceInfo& last_surface_info() const { return last_surface_info_; }
+
+  void Reset();
+
+ private:
+  // SurfaceObserver implementation:
+  void OnSurfaceDamaged(const SurfaceId& surface_id,
+                        const BeginFrameAck& ack,
+                        bool* changed) override;
+  void OnSurfaceCreated(const SurfaceInfo& surface_info) override;
+  void OnSurfaceDiscarded(const SurfaceId& surface_id) override {}
+  void OnSurfaceDestroyed(const SurfaceId& surface_id) override {}
+  void OnSurfaceDamageExpected(const SurfaceId& surface_id,
+                               const BeginFrameArgs& args) override {}
+
+  bool damage_display_;
+  BeginFrameAck last_ack_;
+  base::flat_set<SurfaceId> damaged_surfaces_;
+  SurfaceId last_created_surface_id_;
+  SurfaceInfo last_surface_info_;
+};
+
+}  // namespace cc
+
+#endif  // CC_TEST_FAKE_SURFACE_OBSERVER_H_