Browser-wide audio mirroring for TabCapture API

chrome/browser/extensions/api/tab_capture/tab_capture_api.cc

Index: chrome/browser/extensions/api/tab_capture/tab_capture_api.cc
diff --git a/chrome/browser/extensions/api/tab_capture/tab_capture_api.cc b/chrome/browser/extensions/api/tab_capture/tab_capture_api.cc
index 26f30d6d72b83b6f3d5fbdf8fe6534ddee7ff759..41a27c0ccb06e4474e2f5e76c1c08cc60368e218 100644
--- a/chrome/browser/extensions/api/tab_capture/tab_capture_api.cc
+++ b/chrome/browser/extensions/api/tab_capture/tab_capture_api.cc
@@ -22,6 +22,7 @@
 #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;
@@ -85,7 +86,8 @@ bool TabCaptureCaptureFunction::RunImpl() {
   }
 
   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;