mojo: Update content handler API

mojo/application/content_handler.h

+// Copyright 2014 The Chromium Authors. All rights reserved.

[Aaron Boodman, 2014/10/31 08:24:01]

I would expect this class to be in mojo/public/cpp/application/, as it feels
like part of the public sdk.

Except that my understanding is that mojo/public/cpp/* is not supposed to rely
upon base. Is that why you've put this here?

[qsr, 2014/10/31 12:10:44]

 That and because it depended on ApplicationImpl. With your proposal the latter
is not true anymore, but the base dependency is real (I need to create run
loops, callbacks and threads). At this time, I have no way to move this to the
public sdk.

+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef MOJO_APPLICATION_CONTENT_HANDLER_H_
+#define MOJO_APPLICATION_CONTENT_HANDLER_H_
+
+#include "base/callback.h"

[Aaron Boodman, 2014/10/31 08:24:01]

move this to cc file.

[qsr, 2014/10/31 12:10:44]

Done.

+#include "mojo/public/c/system/core.h"
+#include "mojo/public/cpp/application/application_delegate.h"
+#include "mojo/public/interfaces/application/application.mojom.h"
+#include "mojo/public/interfaces/application/shell.mojom.h"
+#include "mojo/services/public/interfaces/network/url_loader.mojom.h"
+
+namespace mojo {
+
+class ContentHandlerDelegate : public ApplicationDelegate {
+ public:
+  ContentHandlerDelegate() {}
+  // Implement this method to create the ApplicationDelegate for the given
+  // content. The application will be run on its own thread.
+  virtual scoped_ptr<mojo::InterfaceImpl<mojo::Application>> CreateApplication(
+      ShellPtr shell,
+      URLResponsePtr response) = 0;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ContentHandlerDelegate);
+};
+
+// A utility for running a chromium based mojo Application that expose a content
+// handler. The typical use case is to use when writing your MojoMain:
+//
+// MojoResult MojoMain(MojoHandle shell_handle) {
+//   return mojo::ContentHandlerRunner::Run(shell_handle,
+//                                          make_scoped_ptr(new MyDelegate));
+// }
+class ContentHandlerRunner {
+ public:
+  static MojoResult Run(MojoHandle shell_handle,
+                        scoped_ptr<ContentHandlerDelegate> delegate);
+
+ private:
+  ContentHandlerRunner() {}
+};
+
+}  // namespace mojo
+
+#endif  // MOJO_APPLICATION_CONTENT_HANDLER_H_