Browser-wide audio mirroring for TabCapture API

chrome/browser/extensions/api/tab_capture/tab_capture_api.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.
 
 // Implements the Chrome Extensions Tab Capture API.
 
 #include "chrome/browser/extensions/api/tab_capture/tab_capture_api.h"
 
 #include "base/stringprintf.h"
 #include "base/values.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/extensions/api/tab_capture/tab_capture_registry.h"
 #include "chrome/browser/extensions/api/tab_capture/tab_capture_registry_factory.h"
 #include "chrome/browser/extensions/browser_event_router.h"
 #include "chrome/browser/extensions/event_names.h"
 #include "chrome/browser/extensions/extension_tab_id_map.h"
 #include "chrome/browser/sessions/session_tab_helper.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_list.h"
 #include "chrome/browser/ui/tab_contents/tab_contents.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/common/extensions/feature_switch.h"
 #include "content/public/browser/render_process_host.h"
 #include "content/public/browser/render_view_host.h"
+#include "content/public/common/media_stream_request.h"
 
 namespace TabCapture = extensions::api::tab_capture;
 namespace GetCapturedTabs = TabCapture::GetCapturedTabs;
 
 namespace extensions {
 
 namespace {
 
 const char kPermissionError[] =
     "Extension does not have permission for tab capture.";
@@ skipping 43 matching lines @@
     }
   }
 
   if (!found_tab) {
     error_ = kErrorTabIdNotFound;
     SetResult(base::Value::CreateIntegerValue(0));
     return false;
   }
 
   std::string device_id =
-      base::StringPrintf("%i:%i", render_process_id, routing_id);
+      base::StringPrintf("%s%i:%i", content::kMediaStreamTabDeviceScheme,
+                         render_process_id, routing_id);
 
   bool audio = false;
   bool video = false;
   if (params->options.get()) {
     if (params->options->audio.get())
       audio = *params->options->audio.get();
     if (params->options->video.get())
       video = *params->options->video.get();
   }
 
@@ skipping 50 matching lines @@
     info->tab_id = it->tab_id;
     info->status = it->status;
     list->Append(info->ToValue().release());
   }
 
   SetResult(list);
   return true;
 }
 
 }  // namespace extensions