Embed a mojo ApplicationManager in content/browser

content/browser/mojo_shell_context_impl.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_BROWSER_MOJO_SHELL_CONTEXT_IMPL_H_
+#define CONTENT_BROWSER_MOJO_SHELL_CONTEXT_IMPL_H_
+
+#include "base/lazy_instance.h"
+#include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
+#include "content/public/browser/mojo_shell_context.h"
+#include "content/public/common/application_registry.h"
+#include "mojo/shell/application_manager.h"
+
+namespace content {
+
+// Implementation of the global Mojo shell context in the browser.

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

it's not clear to a reader what "mojo shell context" means? can you perhaps
expand a little on what the responsibilities of this class are?

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

Done.

+class MojoShellContextImpl : public MojoShellContext,
+                             public ApplicationRegistry,
+                             public mojo::shell::ApplicationManager::Delegate {
+ public:
+  MojoShellContextImpl();
+  ~MojoShellContextImpl() override;
+
+  // Connects an application at |url| and gets a handle to its exposed services.
+  // This is only intended for use in browser code that's not part of some Mojo
+  // application. May be called from any thread.
+  static void ConnectToApplication(
+      const GURL& url,
+      mojo::InterfaceRequest<mojo::ServiceProvider> request);
+
+ private:
+  class Proxy;
+  friend class Proxy;
+
+  // ApplicationRegistry:
+  void RegisterStaticAppForURL(const GURL& url,
+                               const StaticAppFactory& factory) override;
+
+  void ConnectToApplicationOnOwnThread(
+      const GURL& url,
+      mojo::InterfaceRequest<mojo::ServiceProvider> request);
+
+  // mojo::shell::ApplicationManager::Delegate:
+  GURL ResolveMappings(const GURL& url) override;
+  GURL ResolveMojoURL(const GURL& url) override;
+  bool CreateFetcher(
+      const GURL& url,
+      const mojo::shell::Fetcher::FetchCallback& loader_callback) override;
+
+  static base::LazyInstance<Proxy> proxy_;
+
+  scoped_ptr<mojo::shell::ApplicationManager> application_manager_;
+
+  base::WeakPtrFactory<MojoShellContextImpl> weak_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(MojoShellContextImpl);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_MOJO_SHELL_CONTEXT_IMPL_H_