Move ReferencedSurfaceTracker into GpuCompositorFrameSink.

services/ui/surfaces/display_compositor_unittest.cc

 // 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.
 
 #include "services/ui/surfaces/display_compositor.h"
 
 #include <inttypes.h>
 
 #include <string>
 #include <utility>
@@ skipping 49 matching lines @@
   }
 
  private:
   void AddEvent(const std::string& text) {
     if (!events_.empty())
       events_ += ";";
     events_ += text;
   }
 
   // cc::mojom::DisplayCompositorClient:
-  void OnDisplayCompositorCreated(
-      const cc::SurfaceId& root_surface_id) override {
-    got_root_surface_id_ = true;
-  }
-
   void OnSurfaceCreated(const cc::SurfaceInfo& surface_info) override {
-    EXPECT_TRUE(got_root_surface_id_);
     AddEvent(base::StringPrintf("OnSurfaceCreated(%s)",
                                 SurfaceIdString(surface_info.id()).c_str()));
   }
 
   mojo::Binding<cc::mojom::DisplayCompositorClient> binding_;
   std::string events_;
-  bool got_root_surface_id_ = false;
 
   DISALLOW_COPY_AND_ASSIGN(TestDisplayCompositorClient);
 };
 
 // Test SurfaceReferenceManager that records AddSurfaceReference() and
 // RemoveSurfaceReference() events.
 class TestSurfaceReferenceManager : public cc::SurfaceReferenceManager {
  public:
   ~TestSurfaceReferenceManager() override {}
 
@@ skipping 217 matching lines @@
 
   // The real reference should be added for 2:1:1 and temporary reference
   // should be removed. The temporary reference for 2:1:2 should remain.
   EXPECT_EQ("Add(1:1:1-2:1:1);Remove(0:0:0-2:1:1)",
             reference_manager_.events());
   EXPECT_EQ(1u, CountTempReferences());
 }
 
 }  // namespace test
 }  // namespace ui