Add GPU memory tab to the task manager.

content/public/common/gpu_memory_stats.cc

Index: content/public/common/gpu_memory_stats.cc
diff --git a/content/public/common/gpu_memory_stats.cc b/content/public/common/gpu_memory_stats.cc
new file mode 100644
index 0000000000000000000000000000000000000000..b593ab4150f83720466e437bef21ebe8037769d3
--- /dev/null
+++ b/content/public/common/gpu_memory_stats.cc
@@ -0,0 +1,23 @@
+// 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.
+
+#include "content/public/common/gpu_memory_stats.h"
+
+namespace content {
+
+GPUVideoMemoryUsageStats::GPUVideoMemoryUsageStats() {
+}
+
+GPUVideoMemoryUsageStats::~GPUVideoMemoryUsageStats() {
+}
+
+GPUVideoMemoryUsageStats::ProcessStats::ProcessStats()
+    : video_memory(0),
+      has_duplicates(false) {
+}
+
+GPUVideoMemoryUsageStats::ProcessStats::~ProcessStats() {
+}
+
+}  // namespace content