[Chromoting] Add ProcessStatsDispatcher to send process stats to the client

remoting/base/constants.h

Index: remoting/base/constants.h
diff --git a/remoting/base/constants.h b/remoting/base/constants.h
index c056e782a67363f8f49533c4c4f560514d4fb206..426c6592f47e11ac0c8c730be64b864f69d6ec1c 100644
--- a/remoting/base/constants.h
+++ b/remoting/base/constants.h
@@ -22,6 +22,12 @@ extern const char kMimeTypeTextUtf8[];
 
 const int kDefaultDpi = 96;
 
+// Used as the type attribute of all Security Key protocol::ExtensionMessages.
+extern const char kSecurityKeyExtensionMessageType[];
+
+// Used as the type attribute of process stats protocol::ExtensionMessages.
+extern const char kProcessStatsExtensionMessageType[];
+
 }  // namespace remoting
 
 #endif  // REMOTING_BASE_CONSTANTS_H_