Adding GpuMemoryManager to track GpuCommandBufferStub visibility and last_used_time and dictate mem…

content/common/gpu/gpu_memory_manager.h

+// Copyright (c) 2012 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 CONTENT_COMMON_GPU_GPU_MEMORY_MANAGER_H_
+#define CONTENT_COMMON_GPU_GPU_MEMORY_MANAGER_H_
+#pragma once
+
+#if defined(ENABLE_GPU)
+
+#include <vector>
+
+#include "base/basictypes.h"
+#include "base/memory/weak_ptr.h"
+#include "content/common/content_export.h"
+
+class GpuCommandBufferStubBase;
+
+class CONTENT_EXPORT GpuMemoryManagerClient {
+public:
+  virtual ~GpuMemoryManagerClient() {}
+
+  virtual void AppendAllCommandBufferStubs(
+      std::vector<GpuCommandBufferStubBase*>& stubs) = 0;
+};
+
+class CONTENT_EXPORT GpuMemoryManager {
+ public:
+  static const size_t kDefaultMaxSurfacesWithFrontbufferSoftLimit;
+
+  GpuMemoryManager(GpuMemoryManagerClient* client,
+                   size_t max_surfaces_with_frontbuffer_soft_limit);
+  ~GpuMemoryManager();
+
+  void ScheduleManage();
+
+ private:
+  friend class GpuMemoryManagerTest;
+  void Manage();
+
+  class CONTENT_EXPORT StubWithSurfaceComparator {
+   public:
+    bool operator()(GpuCommandBufferStubBase* lhs,
+                    GpuCommandBufferStubBase* rhs);
+  };
+
+  GpuMemoryManagerClient* client_;
+  bool manage_scheduled_;
+  size_t max_surfaces_with_frontbuffer_soft_limit_;
+  base::WeakPtrFactory<GpuMemoryManager> weak_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(GpuMemoryManager);
+};
+
+#endif
+
+#endif // CONTENT_COMMON_GPU_GPU_MEMORY_MANAGER_H_