Embed a mojo ApplicationManager in content/browser

content/public/browser/mojo_app_connection.h

+// Copyright 2015 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.
+
+#ifndef CONTENT_PUBLIC_BROWSER_MOJO_APP_CONNECTION_H_
+#define CONTENT_PUBLIC_BROWSER_MOJO_APP_CONNECTION_H_
+
+#include <string>
+
+#include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
+#include "content/common/content_export.h"
+#include "third_party/mojo/src/mojo/public/cpp/bindings/interface_ptr.h"
+#include "third_party/mojo/src/mojo/public/cpp/bindings/interface_request.h"
+#include "third_party/mojo/src/mojo/public/cpp/system/message_pipe.h"
+
+class GURL;
+
+namespace content {
+
+// This provides a way for arbitrary browser code to connect to Mojo
+// applications through the global Mojo shell. These objects are not thread-safe

[jam, 2015/05/27 16:05:36]

nit: what does "global mojo shell" mean?

users of content don't need to know about details of implementation. they just
want to know how to connect to a mojo app

[Ken Rockot(use gerrit already), 2015/05/27 19:36:16]

Removed the extra details.

+// but they can be constructed and used on any single thread.
+class CONTENT_EXPORT MojoAppConnection {
+ public:
+  MojoAppConnection() {}
+  virtual ~MojoAppConnection() {}

[jam, 2015/05/27 16:05:36]

nit: see content api wiki and other examples in content/public, we want to
reduce this as much as possible.

i.e. no need for constructor. also no need for disallow_copy_and_assign on a
non-copyable class (since pure virtual method)

[Ken Rockot(use gerrit already), 2015/05/27 19:36:16]

Done.

+
+  // Creates a new connection to the application at |url|. This may be called
+  // from any thread.
+  static scoped_ptr<MojoAppConnection> Create(const GURL& url);
+
+  // Connects to a service within the application.
+  template <typename Interface>
+  void ConnectToService(mojo::InterfacePtr<Interface>* proxy) {
+    ConnectToService(Interface::Name_, mojo::GetProxy(proxy).PassMessagePipe());
+  }
+
+  virtual void ConnectToService(const std::string& service_name,
+                                mojo::ScopedMessagePipeHandle handle) = 0;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(MojoAppConnection);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_PUBLIC_BROWSER_MOJO_APP_CONNECTION_H_