Embed a simple Mojo shell in content

content/public/browser/mojo_shell_context.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_SHELL_CONTEXT_H_
+#define CONTENT_PUBLIC_BROWSER_MOJO_SHELL_CONTEXT_H_
+
+#include "base/bind.h"
+#include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
+#include "mojo/shell/application_loader.h"
+#include "url/gurl.h"
+
+namespace mojo {
+class ApplicationDelegate;
+}  // namespace mojo
+
+namespace content {
+
+// The global Mojo shell context for content embedders. By default this will
+// load new application instances in a utility process. A content embedder may
+// configure the global shell by overriding
+// |ContentBrowserClient::ConfigureMojoShell|.
+class MojoShellContext {
+ public:
+  MojoShellContext() {}
+  virtual ~MojoShellContext() {}
+
+  // Adds a mapping from |url| to the given |loader|, overriding the default
+  // loader used by content's Mojo shell.
+  virtual void AddCustomLoader(
+      const GURL& url,
+      scoped_ptr<mojo::shell::ApplicationLoader> loader) = 0;
+
+  // Adds a mapping from |url| to an in-process, static loader for a given
+  // |mojo::ApplicationDelegate| type.
+  template <typename DelegateType>
+  void AddInProcessStaticLoader(const GURL& url) {
+    AddCustomLoader(
+        url, CreateStaticLoader(
+                 url.spec(),
+                 base::Bind(
+                     &MojoShellContext::LoadStaticApplication<DelegateType>)));
+  }
+
+  // Creates a new MojoShellContext.
+  static scoped_ptr<MojoShellContext> Create();
+
+ private:
+  static scoped_ptr<mojo::shell::ApplicationLoader> CreateStaticLoader(
+      const std::string& name,
+      const base::Callback<scoped_ptr<mojo::ApplicationDelegate>()>& factory);
+
+  template <typename DelegateType>
+  static scoped_ptr<mojo::ApplicationDelegate> LoadStaticApplication() {
+    return scoped_ptr<mojo::ApplicationDelegate>(new DelegateType);
+  }
+
+  DISALLOW_COPY_AND_ASSIGN(MojoShellContext);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_PUBLIC_BROWSER_MOJO_SHELL_CONTEXT_H_