1 files changed, 55 insertions, 0 deletions
diff --git a/chromium/cc/resources/memory_history.h b/chromium/cc/resources/memory_history.h
new file mode 100644
index 00000000000..daca10f35a0
--- /dev/null
+++ b/chromium/cc/resources/memory_history.h
@@ -0,0 +1,55 @@
+// 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_RESOURCES_MEMORY_HISTORY_H_
+#define CC_RESOURCES_MEMORY_HISTORY_H_
+
+#include "base/basictypes.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/time/time.h"
+#include "cc/debug/ring_buffer.h"
+
+namespace cc {
+
+// Maintains a history of memory for each frame.
+class MemoryHistory {
+ public:
+  static scoped_ptr<MemoryHistory> Create();
+
+  size_t HistorySize() const { return ring_buffer_.BufferSize(); }
+
+  struct Entry {
+    Entry()
+        : total_budget_in_bytes(0),
+          bytes_allocated(0),
+          bytes_unreleasable(0),
+          bytes_over(0) {}
+
+    size_t total_budget_in_bytes;
+    size_t bytes_allocated;
+    size_t bytes_unreleasable;
+    size_t bytes_over;
+    size_t bytes_total() const {
+      return bytes_allocated + bytes_unreleasable + bytes_over;
+    }
+  };
+
+  void SaveEntry(const Entry& entry);
+  void GetMinAndMax(size_t* min, size_t* max) const;
+
+  typedef RingBuffer<Entry, 80> RingBufferType;
+  RingBufferType::Iterator Begin() const { return ring_buffer_.Begin(); }
+  RingBufferType::Iterator End() const { return ring_buffer_.End(); }
+
+ private:
+  MemoryHistory();
+
+  RingBufferType ring_buffer_;
+
+  DISALLOW_COPY_AND_ASSIGN(MemoryHistory);
+};
+
+}  // namespace cc
+
+#endif  // CC_RESOURCES_MEMORY_HISTORY_H_