Adds associated interface support to IPC::Channel

ipc/ipc_channel_mojo.cc

Index: ipc/ipc_channel_mojo.cc
diff --git a/ipc/ipc_channel_mojo.cc b/ipc/ipc_channel_mojo.cc
index 22efa3a335f6a9594eda2dccad69497dc8579b80..b7f7a4f35dbc13b2e7d3a5abbd8c5a66a0edccab 100644
--- a/ipc/ipc_channel_mojo.cc
+++ b/ipc/ipc_channel_mojo.cc
@@ -294,6 +294,25 @@ void ChannelMojo::Close() {
   reader.reset();
 }
 
+mojo::AssociatedGroup* ChannelMojo::GetAssociatedGroup() {
+  DCHECK(bootstrap_);
+  return bootstrap_->GetAssociatedGroup();
+}
+
+void ChannelMojo::AddGenericAssociatedInterface(
+    const std::string& name,
+    const GenericAssociatedInterfaceFactory& factory) {
+  auto result = associated_interfaces_.insert({ name, factory });
+  DCHECK(result.second);
+}
+
+void ChannelMojo::GetGenericRemoteAssociatedInterface(
+    const std::string& name,
+    mojo::ScopedInterfaceEndpointHandle handle) {
+  DCHECK(message_reader_);
+  message_reader_->GetRemoteInterface(name, std::move(handle));
+}
+
 // MojoBootstrap::Delegate implementation
 void ChannelMojo::OnPipesAvailable(
     mojom::ChannelAssociatedPtrInfo send_channel,
@@ -307,6 +326,14 @@ void ChannelMojo::OnBootstrapError() {
   listener_->OnChannelError();
 }
 
+void ChannelMojo::OnAssociatedInterfaceRequest(
+    const std::string& name,
+    mojo::ScopedInterfaceEndpointHandle handle) {
+  auto iter = associated_interfaces_.find(name);
+  if (iter != associated_interfaces_.end())
+    iter->second.Run(std::move(handle));
+}
+
 void ChannelMojo::InitMessageReader(mojom::ChannelAssociatedPtrInfo sender,
                                     mojom::ChannelAssociatedRequest receiver,
                                     base::ProcessId peer_pid) {