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

content/common/gpu/gpu_memory_allocation.h

Index: content/common/gpu/gpu_memory_allocation.h
diff --git a/content/common/gpu/gpu_memory_allocation.h b/content/common/gpu/gpu_memory_allocation.h
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+// 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_ALLOCATION_H_
+#define CONTENT_COMMON_GPU_GPU_MEMORY_ALLOCATION_H_
+#pragma once
+
+#include "base/basictypes.h"
+
+// These are memory allocation limits assigned to a context.
+// They will change over time, given memory availability, browser state, and
+// GpuIdealMemoryAllocation values (see below).
+// Exceeding these limits for an unreasonable amount of time will cause kill.
+struct GpuMemoryAllocation {
+  static const int kResourceSizeForegroundTab = 100 * 1024 * 1024;
+  static const int kResourceSizeBackgroundTab = 50 * 1024 * 1024;
+  static const int kResourceSizeHibernatedTab = 0;
+
+  int gpuResourceSizeInBytes;
+  bool hasFrontbuffer;
+  bool hasBackbuffer;
+
+  GpuMemoryAllocation()
+      : gpuResourceSizeInBytes(0)
+      , hasFrontbuffer(false)
+      , hasBackbuffer(false) {
+  }
+
+  GpuMemoryAllocation(int gpuResourceSizeInBytes,
+                      bool hasFrontbuffer,
+                      bool hasBackbuffer)
+      : gpuResourceSizeInBytes(gpuResourceSizeInBytes)
+      , hasFrontbuffer(hasFrontbuffer)
+      , hasBackbuffer(hasBackbuffer) {
+  }
+};
+
+// Contexts should give ideal memory allocation hints to the GpuMemoryManager
+// so that it can make better decisions on how to split resources.
+// If memory is constrained and/or this context has lower priority than others,
+// these requests will be overruled (see actual allocation limits above).
+struct GpuIdealMemoryAllocation {
+};
+
+#endif // CONTENT_COMMON_GPU_GPU_MEMORY_ALLOCATION_H_