Histograms - Support histograms for Plugins, GPU

content/browser/histogram_message_filter.h

Index: content/browser/histogram_message_filter.h
===================================================================
--- content/browser/histogram_message_filter.h	(revision 0)
+++ content/browser/histogram_message_filter.h	(working copy)
@@ -0,0 +1,42 @@
+// 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_BROWSER_HISTOGRAM_MESSAGE_FILTER_H_
+#define CONTENT_BROWSER_HISTOGRAM_MESSAGE_FILTER_H_
+
+#include <string>
+#include <vector>
+
+#include "content/public/browser/browser_message_filter.h"
+#include "content/public/common/process_type.h"
+
+namespace content {
+
+// This class sends and receives histogram messages in the browser process.
+class HistogramMessageFilter : public BrowserMessageFilter {
+ public:
+  HistogramMessageFilter();
+
+  // content::BrowserMessageFilter implementation.
+  virtual void OnChannelConnected(int32 peer_pid) OVERRIDE;
+
+  // content::BrowserMessageFilter implementation.
+  virtual bool OnMessageReceived(const IPC::Message& message,
+                                 bool* message_was_ok) OVERRIDE;
+
+ private:
+  virtual ~HistogramMessageFilter();
+
+  // Message handlers.
+  void OnChildHistogramData(int sequence_number,
+                            const std::vector<std::string>& pickled_histograms);
+
+  ProcessType process_type_;
+
+  DISALLOW_COPY_AND_ASSIGN(HistogramMessageFilter);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_HISTOGRAM_MESSAGE_FILTER_H_