Implement throttling behavior for LocalStorage mojo messages.

mojo/public/cpp/bindings/lib/multiplex_router.h

Index: mojo/public/cpp/bindings/lib/multiplex_router.h
diff --git a/mojo/public/cpp/bindings/lib/multiplex_router.h b/mojo/public/cpp/bindings/lib/multiplex_router.h
index 0d5899870b829790dbdf356302f09dca4576f87c..fda26f2c7459682c8bb8edb959365884d77763a0 100644
--- a/mojo/public/cpp/bindings/lib/multiplex_router.h
+++ b/mojo/public/cpp/bindings/lib/multiplex_router.h
@@ -70,12 +70,27 @@ class MOJO_CPP_BINDINGS_EXPORT MultiplexRouter
     MULTI_INTERFACE
   };
 
+  // Specifies whether we are allowed to directly call into
+  // InterfaceEndpointClient (given that we are already on the same thread as
+  // the client).
+  enum ClientCallBehavior {
+    // Don't call any InterfaceEndpointClient methods directly.
+    NO_DIRECT_CLIENT_CALLS,
+    // Only call InterfaceEndpointClient::HandleIncomingMessage directly to
+    // handle sync messages.
+    ALLOW_DIRECT_CLIENT_CALLS_FOR_SYNC_MESSAGES,
+    // Allow to call any InterfaceEndpointClient methods directly.
+    ALLOW_DIRECT_CLIENT_CALLS
+  };
+
   // If |set_interface_id_namespace_bit| is true, the interface IDs generated by
   // this router will have the highest bit set.
   MultiplexRouter(ScopedMessagePipeHandle message_pipe,
                   Config config,
                   bool set_interface_id_namespace_bit,
-                  scoped_refptr<base::SingleThreadTaskRunner> runner);
+                  scoped_refptr<base::SingleThreadTaskRunner> runner,
+                  ClientCallBehavior sync_client_call_behavior =
+                      ALLOW_DIRECT_CLIENT_CALLS_FOR_SYNC_MESSAGES);
 
   // Sets the master interface name for this router. Only used when reporting
   // message header or control message validation errors.
@@ -163,19 +178,6 @@ class MOJO_CPP_BINDINGS_EXPORT MultiplexRouter
 
   void OnPipeConnectionError();
 
-  // Specifies whether we are allowed to directly call into
-  // InterfaceEndpointClient (given that we are already on the same thread as
-  // the client).
-  enum ClientCallBehavior {
-    // Don't call any InterfaceEndpointClient methods directly.
-    NO_DIRECT_CLIENT_CALLS,
-    // Only call InterfaceEndpointClient::HandleIncomingMessage directly to
-    // handle sync messages.
-    ALLOW_DIRECT_CLIENT_CALLS_FOR_SYNC_MESSAGES,
-    // Allow to call any InterfaceEndpointClient methods directly.
-    ALLOW_DIRECT_CLIENT_CALLS
-  };
-
   // Processes enqueued tasks (incoming messages and error notifications).
   // |current_task_runner| is only used when |client_call_behavior| is
   // ALLOW_DIRECT_CLIENT_CALLS to determine whether we are on the right task
@@ -260,6 +262,8 @@ class MOJO_CPP_BINDINGS_EXPORT MultiplexRouter
 
   bool testing_mode_;
 
+  ClientCallBehavior sync_client_call_behavior_;
+
   DISALLOW_COPY_AND_ASSIGN(MultiplexRouter);
 };