Add DBusStatistics and DBusLogSource to log and show dbus stats

dbus/dbus_statistics.h

Index: dbus/dbus_statistics.h
diff --git a/dbus/dbus_statistics.h b/dbus/dbus_statistics.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 DBUS_DBUS_STATISTICS_H_
+#define DBUS_DBUS_STATISTICS_H_
+
+#include <string>
+
+#include "dbus/dbus_export.h"
+
+namespace dbus {
+namespace statistics {
+
+// Enum to specify what level of detail to show in GetAsString
+enum ShowInString {
+  SHOW_SERVICE = 0,  // Service totals only
+  SHOW_INTERFACE = 1,  // Service + interface totals
+  SHOW_METHOD = 2,  // Service + interface + method totals
+};
+
+// Enum to specify how to format the display in GetAsString
+enum FormatString {
+  FORMAT_TOTALS = 0,  // Raw totals only
+  FORMAT_PER_MINUTE = 1,  // Per-minute only
+  FORMAT_ALL = 2  // Include all format details
+};
+
+// Initializes / shuts down dbus statistics gathering. Calling Initialize
+// more than once will reset the statistics.
+CHROME_DBUS_EXPORT void Initialize();
+CHROME_DBUS_EXPORT void Shutdown();
+
+// Add sent/received calls to the statistics gathering class. These methods
+// do nothing unless Initialize() was called.
+CHROME_DBUS_EXPORT void AddSentMethodCall(const std::string& service,
+                                          const std::string& interface,
+                                          const std::string& method);
+CHROME_DBUS_EXPORT void AddReceivedSignal(const std::string& service,
+                                          const std::string& interface,
+                                          const std::string& method);
+// Track synchronous calls independently since we want to highlight
+// (and remove) these.
+CHROME_DBUS_EXPORT void AddBlockingSentMethodCall(const std::string& service,
+                                                  const std::string& interface,
+                                                  const std::string& method);
+
+// Output the calls into a formatted string. |show| determines what level
+// of detail to show: one line per service, per interface, or per method.
+// If |show_per_minute| is true include per minute stats.
+// Example output for SHOW_METHOD, FORMAT_TOTALS:
+//   org.chromium.Mtpd.EnumerateStorage: Sent: 100
+//   org.chromium.Mtpd.MTPStorageSignal: Received: 20
+// Example output for SHOW_INTERFACE, FORMAT_ALL:
+//   org.chromium.Mtpd: Sent: 100 (10/min) Received: 20 (2/min)
+CHROME_DBUS_EXPORT std::string GetAsString(ShowInString show,
+                                           FormatString format);
+
+namespace testing {
+// Sets |sent| to the number of sent calls, |received| to the number of
+// received calls, and |blocking| to the number of sent blocking calls for
+// service+interface+method. Used in unittests.
+CHROME_DBUS_EXPORT bool GetCalls(const std::string& service,
+                                 const std::string& interface,
+                                 const std::string& method,
+                                 int* sent,
+                                 int* received,
+                                 int* blocking);
+}  // namespace testing
+
+}  // namespace statistics
+}  // namespace dbus
+
+#endif  // DBUS_DBUS_STATISTICS_H_