Embed a simple Mojo shell in content

content/public/browser/mojo_app_connection.h

Index: content/public/browser/mojo_app_connection.h
diff --git a/content/public/browser/mojo_app_connection.h b/content/public/browser/mojo_app_connection.h
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+// 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 "base/macros.h"
+#include "content/common/content_export.h"
+#include "third_party/mojo/src/mojo/public/interfaces/application/service_provider.mojom.h"
+#include "third_party/mojo/src/mojo/public/interfaces/application/shell.mojom.h"
+#include "url/gurl.h"
+
+namespace mojo {
+
+namespace shell {
+class ApplicationManager;
+}  // namespace shell
+}  // namespace mojo
+
+namespace content {
+class MojoShellContextImpl;
+
+// Provides a way for browser code to connect to Mojo applications though the
+// global Mojo shell. These objects may be constructed on any thread.
+class CONTENT_EXPORT MojoAppConnection {
+ public:
+  // Constructs a new browser shell proxy which will connect to an application
+  // at |application_url| to get remote services.
+  explicit MojoAppConnection(const GURL& application_url);
+  ~MojoAppConnection();
+
+  // Connects to a remote service by type.
+  template <typename Interface>
+  void ConnectToService(mojo::InterfacePtr<Interface>* proxy) {
+    remote_services_->ConnectToService(Interface::Name_,
+                                       mojo::GetProxy(proxy).PassMessagePipe());
+  }
+
+ private:
+  friend class MojoShellContextImpl;
+
+  // Called by whomever creates the global ApplicationManager. In practice,
+  // that's MojoShellContext. Should be called from whatever thread the
+  // ApplicationManager lives on.
+  static void SetApplicationManager(
+      mojo::shell::ApplicationManager* application_manager);
+
+  mojo::ServiceProviderPtr remote_services_;
+
+  DISALLOW_COPY_AND_ASSIGN(MojoAppConnection);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_PUBLIC_BROWSER_MOJO_APP_CONNECTION_H_