app_shell: Add audio and video capture support

extensions/shell/browser/shell_app_window.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_app_window.h"
 
 #include "content/public/browser/navigation_controller.h"
 #include "content/public/browser/render_view_host.h"
 #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"
 
 using content::BrowserContext;
 using content::WebContents;
 
 namespace extensions {
 
-ShellAppWindow::ShellAppWindow() {
+ShellAppWindow::ShellAppWindow() : extension_(NULL) {
 }
 
 ShellAppWindow::~ShellAppWindow() {
 }
 
-void ShellAppWindow::Init(BrowserContext* context, gfx::Size initial_size) {
+void ShellAppWindow::Init(BrowserContext* context,
+                          const Extension* extension,
+                          gfx::Size initial_size) {
+  DCHECK(extension);
+  DCHECK(context);
+  extension_ = extension;
   extension_function_dispatcher_.reset(
       new ExtensionFunctionDispatcher(context, this));
 
   // Create the web contents with an initial size to avoid a resize.
   WebContents::CreateParams create_params(context);
   create_params.initial_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());
 
   SetViewType(web_contents_.get(), VIEW_TYPE_APP_WINDOW);
 }
 
 void ShellAppWindow::LoadURL(const GURL& url) {
   content::NavigationController::LoadURLParams params(url);
   web_contents_->GetController().LoadURLWithParams(params);
   web_contents_->Focus();
 }
 
 aura::Window* ShellAppWindow::GetNativeWindow() {
   return web_contents_->GetNativeView();
 }
 
 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, extension_);
+}
+
 bool ShellAppWindow::OnMessageReceived(const IPC::Message& message) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(ShellAppWindow, message)
   IPC_MESSAGE_HANDLER(ExtensionHostMsg_Request, OnRequest)
   IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
 }
 
 content::WebContents* ShellAppWindow::GetAssociatedWebContents() const {
   return web_contents_.get();
 }
 
 void ShellAppWindow::OnRequest(const ExtensionHostMsg_Request_Params& params) {
   extension_function_dispatcher_->Dispatch(params,
                                            web_contents_->GetRenderViewHost());
 }
 
 }  // namespace extensions