Support exposing Mojo services between render frames, render threads, and their respective hosts.

content/common/mojo/service_registry_impl.cc

+// Copyright 2014 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.
+
+#include "content/common/mojo/service_registry_impl.h"
+
+#include "mojo/common/common_type_converters.h"
+
+namespace content {
+
+ServiceRegistryImpl::ServiceRegistryImpl() : bound_(false) {
+}
+
+ServiceRegistryImpl::ServiceRegistryImpl(mojo::ScopedMessagePipeHandle handle)
+    : bound_(false) {
+  BindRemoteServiceProvider(handle.Pass());
+}
+
+ServiceRegistryImpl::~ServiceRegistryImpl() {
+  while (!pending_connects_.empty()) {
+    mojo::ScopedMessagePipeHandle handle(pending_connects_.front().second);

[darin (slow to review), 2014/06/21 04:33:35]

You could also use mojo::CloseRaw here. That might make your intent slightly
clearer.

[Sam McNally, 2014/06/24 04:00:29]

Done.

+    pending_connects_.pop();
+  }
+}
+
+void ServiceRegistryImpl::BindRemoteServiceProvider(
+    mojo::ScopedMessagePipeHandle handle) {
+  if (bound_)
+    return;
+
+  mojo::BindToPipe(this, handle.Pass());
+  bound_ = true;
+  while (!pending_connects_.empty()) {
+    client()->GetInterface(
+        mojo::String::From(pending_connects_.front().first),
+        mojo::ScopedMessagePipeHandle(pending_connects_.front().second));
+    pending_connects_.pop();
+  }
+}
+
+void ServiceRegistryImpl::OnConnectionError() {
+  // TODO(sammc): Support reporting this to our owner.
+  bound_ = false;
+}
+
+void ServiceRegistryImpl::AddService(
+    const std::string& service_name,
+    const base::Callback<void(mojo::ScopedMessagePipeHandle)> service_factory) {
+  service_factories_[service_name] = service_factory;
+}
+
+void ServiceRegistryImpl::RemoveService(const std::string& service_name) {
+  service_factories_.erase(service_name);
+}
+
+void ServiceRegistryImpl::GetRemoteInterface(
+    const base::StringPiece& service_name,
+    mojo::ScopedMessagePipeHandle handle) {
+  if (!bound_) {
+    pending_connects_.push(
+        std::make_pair(service_name.as_string(), handle.release()));
+    return;
+  }
+  client()->GetInterface(mojo::String::From(service_name), handle.Pass());
+}
+
+void ServiceRegistryImpl::GetInterface(
+    const mojo::String& name,
+    mojo::ScopedMessagePipeHandle client_handle) {
+  std::map<std::string,
+           base::Callback<void(mojo::ScopedMessagePipeHandle)> >::iterator it =
+      service_factories_.find(name);
+  if (it == service_factories_.end())
+    return;
+
+  it->second.Run(client_handle.Pass());
+}
+
+}  // namespace content