Support early associated interface binding on ChannelMojo

ipc/ipc_channel_mojo.h

Index: ipc/ipc_channel_mojo.h
diff --git a/ipc/ipc_channel_mojo.h b/ipc/ipc_channel_mojo.h
index 940dcf0bbb085a3f32f39a9931366c82a925c6e7..d10233f6c30b30f5acab9f2fa1db5f2ad35e3ffa 100644
--- a/ipc/ipc_channel_mojo.h
+++ b/ipc/ipc_channel_mojo.h
@@ -42,7 +42,7 @@ namespace IPC {
 class IPC_EXPORT ChannelMojo
     : public Channel,
       public Channel::AssociatedInterfaceSupport,
-      public MojoBootstrap::Delegate,
+      public NON_EXPORTED_BASE(MojoBootstrap::Delegate),
       public NON_EXPORTED_BASE(internal::MessagePipeReader::Delegate) {
  public:
   // Creates a ChannelMojo.
@@ -90,17 +90,16 @@ class IPC_EXPORT ChannelMojo
       mojo::Array<mojom::SerializedHandlePtr>* handles);
 
   // MojoBootstrapDelegate implementation
-  void OnPipesAvailable(mojom::ChannelAssociatedPtrInfo send_channel,
-                        mojom::ChannelAssociatedRequest receive_channel,
-                        int32_t peer_pid) override;
-  void OnBootstrapError() override;
-  void OnAssociatedInterfaceRequest(
-      const std::string& name,
-      mojo::ScopedInterfaceEndpointHandle handle) override;
+  void OnPipesAvailable(mojom::ChannelAssociatedPtr sender,
+                        mojom::ChannelAssociatedRequest receiver) override;
 
   // MessagePipeReader::Delegate
+  void OnPeerPidReceived() override;
   void OnMessageReceived(const Message& message) override;
   void OnPipeError() override;
+  void OnAssociatedInterfaceRequest(
+      const std::string& name,
+      mojo::ScopedInterfaceEndpointHandle handle) override;
 
  private:
   ChannelMojo(
@@ -109,10 +108,6 @@ class IPC_EXPORT ChannelMojo
       Listener* listener,
       const scoped_refptr<base::SingleThreadTaskRunner>& ipc_task_runner);
 
-  void InitMessageReader(mojom::ChannelAssociatedPtrInfo sender,
-                         mojom::ChannelAssociatedRequest receiver,
-                         base::ProcessId peer_pid);
-
   // Channel::AssociatedInterfaceSupport:
   mojo::AssociatedGroup* GetAssociatedGroup() override;
   void AddGenericAssociatedInterface(
@@ -121,8 +116,6 @@ class IPC_EXPORT ChannelMojo
   void GetGenericRemoteAssociatedInterface(
       const std::string& name,
       mojo::ScopedInterfaceEndpointHandle handle) override;
-  void SetProxyTaskRunner(
-      scoped_refptr<base::SingleThreadTaskRunner> task_runner) override;
 
   // ChannelMojo needs to kill its MessagePipeReader in delayed manner
   // because the channel wants to kill these readers during the
@@ -136,14 +129,13 @@ class IPC_EXPORT ChannelMojo
   std::unique_ptr<MojoBootstrap> bootstrap_;
   Listener* listener_;
 
+  base::Lock associated_interface_lock_;
   std::map<std::string, GenericAssociatedInterfaceFactory>
       associated_interfaces_;
 
   // Guards access to the fields below.
   mutable base::Lock lock_;
   std::unique_ptr<internal::MessagePipeReader, ReaderDeleter> message_reader_;
-  std::vector<std::unique_ptr<Message>> pending_messages_;
-  bool waiting_connect_;
 
   base::WeakPtrFactory<ChannelMojo> weak_factory_;