Begin adding support for tab mirroring via the MediaStream audio/video capturing

chrome/browser/ui/extensions/shell_window.cc

 // Copyright (c) 2012 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 "chrome/browser/ui/extensions/shell_window.h"
 
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/extensions/extension_process_manager.h"
 #include "chrome/browser/extensions/shell_window_registry.h"
 #include "chrome/browser/file_select_helper.h"
@@ skipping 134 matching lines @@
   // Remove shutdown prevention.
   browser::EndKeepAlive();
 }
 
 void ShellWindow::RequestMediaAccessPermission(
     content::WebContents* web_contents,
     const content::MediaStreamRequest* request,
     const content::MediaResponseCallback& callback) {
   content::MediaStreamDevices devices;
 
-  content::MediaStreamDeviceMap::const_iterator iter =
-      request->devices.find(content::MEDIA_STREAM_DEVICE_TYPE_AUDIO_CAPTURE);
-  if (iter != request->devices.end() &&
-      extension()->HasAPIPermission(APIPermission::kAudioCapture) &&
-      !iter->second.empty()) {
-    devices.push_back(iter->second[0]);
-  }
-
-  iter = request->devices.find(content::MEDIA_STREAM_DEVICE_TYPE_VIDEO_CAPTURE);
-  if (iter != request->devices.end() &&
-      extension()->HasAPIPermission(APIPermission::kVideoCapture) &&
-      !iter->second.empty()) {
-    devices.push_back(iter->second[0]);
+  // Auto-accept the first audio device and the first video device from the
+  // request when the appropriate API permissions exist.
+  bool accepted_an_audio_device = false;
+  bool accepted_a_video_device = false;
+  for (content::MediaStreamDeviceMap::const_iterator it =
+           request->devices.begin();
+       it != request->devices.end(); ++it) {
+    if (!accepted_an_audio_device &&
+        content::IsAudioMediaStreamDeviceType(it->first) &&
+        extension()->HasAPIPermission(APIPermission::kAudioCapture) &&
+        !it->second.empty()) {
+      devices.push_back(it->second.front());
+      accepted_an_audio_device = true;
+    } else if (!accepted_a_video_device &&
+               content::IsVideoMediaStreamDeviceType(it->first) &&
+               extension()->HasAPIPermission(APIPermission::kVideoCapture) &&
+               !it->second.empty()) {
+      devices.push_back(it->second.front());
+      accepted_a_video_device = true;
+    }
   }
 
   callback.Run(devices);
 }
 
 WebContents* ShellWindow::OpenURLFromTab(WebContents* source,
                                          const content::OpenURLParams& params) {
   DCHECK(source == web_contents_);
 
   if (params.url.host() == extension_->id()) {
@@ skipping 191 matching lines @@
   extension_function_dispatcher_.Dispatch(params,
                                           web_contents_->GetRenderViewHost());
 }
 
 void ShellWindow::AddMessageToDevToolsConsole(ConsoleMessageLevel level,
                                               const std::string& message) {
   content::RenderViewHost* rvh = web_contents_->GetRenderViewHost();
   rvh->Send(new ExtensionMsg_AddMessageToConsole(
       rvh->GetRoutingID(), level, message));
 }