app_shell: Add audio and video capture support

extensions/shell/browser/shell_extension_host_delegate.cc

+// Copyright 2014 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.
+
+#include "extensions/shell/browser/shell_extension_host_delegate.h"
+
+#include "base/logging.h"
+#include "extensions/shell/browser/media_capture_util.h"
+#include "extensions/shell/browser/shell_extension_web_contents_observer.h"
+
+namespace extensions {
+
+ShellExtensionHostDelegate::ShellExtensionHostDelegate() {
+}
+
+ShellExtensionHostDelegate::~ShellExtensionHostDelegate() {
+}
+
+void ShellExtensionHostDelegate::OnExtensionHostCreated(
+    content::WebContents* web_contents) {
+  ShellExtensionWebContentsObserver::CreateForWebContents(web_contents);
+}
+
+void ShellExtensionHostDelegate::OnRenderViewCreatedForBackgroundPage(
+    ExtensionHost* host) {
+}
+
+content::JavaScriptDialogManager*
+ShellExtensionHostDelegate::GetJavaScriptDialogManager() {
+  // TODO(jamescook): Create a JavaScriptDialogManager or reuse the one from
+  // content_shell.
+  NOTREACHED();
+  return NULL;
+}
+
+void ShellExtensionHostDelegate::CreateTab(content::WebContents* web_contents,
+                                           const std::string& extension_id,
+                                           WindowOpenDisposition disposition,
+                                           const gfx::Rect& initial_pos,
+                                           bool user_gesture) {
+  // TODO(jamescook): Should app_shell support opening popup windows?
+  NOTREACHED();
+}
+
+void ShellExtensionHostDelegate::ProcessMediaAccessRequest(
+    content::WebContents* web_contents,
+    const content::MediaStreamRequest& request,
+    const content::MediaResponseCallback& callback,
+    const Extension* extension) {
+  // Allow access to the first microphone and/or camera.
+  media_capture_util::GrantMediaStreamRequestWithFirstDevice(

[James Cook, 2014/08/20 18:17:16]

This is the only line I added -- the rest is just moved.

[no longer working on chromium, 2014/08/22 13:09:53]

I am not very sure, but shouldn't you do some kind of permission control and ui
notification here?
like ChromeExtensionHostDelegate::ProcessMediaAccessRequest, which will
eventually call 
MediaCaptureDevicesDispatcher::ProcessMediaAccessRequestFromPlatformAppOrExtension()

+      web_contents, request, callback);
+}
+
+}  // namespace extensions
+