Update Context Client Visibility to use Scoped Pattern

cc/test/test_context_support.h

 // Copyright 2013 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_TEST_CONTEXT_SUPPORT_H_
 #define CC_TEST_TEST_CONTEXT_SUPPORT_H_
 
 #include <stdint.h>
 
 #include <set>
@@ skipping 12 matching lines @@
 
 class TestContextSupport : public gpu::ContextSupport {
  public:
   TestContextSupport();
   ~TestContextSupport() override;
 
   // gpu::ContextSupport implementation.
   void SignalSyncToken(const gpu::SyncToken& sync_token,
                        const base::Closure& callback) override;
   void SignalQuery(uint32_t query, const base::Closure& callback) override;
-  void SetAggressivelyFreeResources(bool aggressively_free_resources) override;
+  void TrimResources() override;
   void Swap() override;
   void PartialSwapBuffers(const gfx::Rect& sub_buffer) override;
   void CommitOverlayPlanes() override;
   void ScheduleOverlayPlane(int plane_z_order,
                             gfx::OverlayTransform plane_transform,
                             unsigned overlay_texture_id,
                             const gfx::Rect& display_bounds,
                             const gfx::RectF& uv_rect) override;
   uint64_t ShareGroupTracingGUID() const override;
   void SetErrorMessageCallback(
       const base::Callback<void(const char*, int32_t)>& callback) override;
-  void SetClientVisible(int client_id, bool is_visible) override;
+  std::unique_ptr<ScopedVisibility> ClientBecameVisible() override;
+  void ClientBecameNotVisible(
+      std::unique_ptr<ScopedVisibility> visibility) override;
   bool AnyClientsVisible() const override;
 
   void CallAllSyncPointCallbacks();
 
   typedef base::Callback<void(int plane_z_order,
                               gfx::OverlayTransform plane_transform,
                               unsigned overlay_texture_id,
                               const gfx::Rect& display_bounds,
                               const gfx::RectF& crop_rect)>
       ScheduleOverlayPlaneCallback;
   void SetScheduleOverlayPlaneCallback(
       const ScheduleOverlayPlaneCallback& schedule_overlay_plane_callback);
 
   // If set true, callbacks triggering will be in a reverse order as SignalQuery
   // calls.
   void set_out_of_order_callbacks(bool out_of_order_callbacks) {
     out_of_order_callbacks_ = out_of_order_callbacks;
   }
 
  private:
   std::vector<base::Closure> sync_point_callbacks_;
   ScheduleOverlayPlaneCallback schedule_overlay_plane_callback_;
-  bool out_of_order_callbacks_;
-  std::set<int> visible_clients_;
+  bool out_of_order_callbacks_ = false;
+  uint32_t num_visible_clients_ = 0;
 
   base::WeakPtrFactory<TestContextSupport> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(TestContextSupport);
 };
 
 }  // namespace cc
 
 #endif  // CC_TEST_TEST_CONTEXT_SUPPORT_H_