app_shell: Add audio and video capture support

extensions/shell/browser/shell_app_window.cc

Index: extensions/shell/browser/shell_app_window.cc
diff --git a/extensions/shell/browser/shell_app_window.cc b/extensions/shell/browser/shell_app_window.cc
index a66554ea1ca03f7e7b7292684f9fc5984e334fdb..847ddf08d7f27b423a1448bd40c5b5f551f12f77 100644
--- a/extensions/shell/browser/shell_app_window.cc
+++ b/extensions/shell/browser/shell_app_window.cc
@@ -9,6 +9,7 @@
 #include "content/public/browser/web_contents.h"
 #include "extensions/browser/view_type_utils.h"
 #include "extensions/common/extension_messages.h"
+#include "extensions/shell/browser/media_capture_util.h"
 #include "extensions/shell/browser/shell_extension_web_contents_observer.h"
 #include "ipc/ipc_message_macros.h"
 
@@ -33,6 +34,7 @@ void ShellAppWindow::Init(BrowserContext* context, gfx::Size initial_size) {
   web_contents_.reset(WebContents::Create(create_params));
 
   content::WebContentsObserver::Observe(web_contents_.get());
+  web_contents_->SetDelegate(this);
 
   // Add support for extension startup.
   ShellExtensionWebContentsObserver::CreateForWebContents(web_contents_.get());
@@ -54,6 +56,15 @@ int ShellAppWindow::GetRenderViewRoutingID() {
   return web_contents_->GetRenderViewHost()->GetRoutingID();
 }
 
+void ShellAppWindow::RequestMediaAccessPermission(
+    content::WebContents* web_contents,
+    const content::MediaStreamRequest& request,
+    const content::MediaResponseCallback& callback) {
+  // Allow access to the first microphone and/or camera.
+  media_capture_util::GrantMediaStreamRequestWithFirstDevice(
+      web_contents, request, callback);
+}
+
 bool ShellAppWindow::OnMessageReceived(const IPC::Message& message) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(ShellAppWindow, message)