Add gpu::MailboxHolder to hold state for a gpu::Mailbox

content/browser/renderer_host/media/desktop_capture_device_aura.cc

Index: content/browser/renderer_host/media/desktop_capture_device_aura.cc
diff --git a/content/browser/renderer_host/media/desktop_capture_device_aura.cc b/content/browser/renderer_host/media/desktop_capture_device_aura.cc
index 5419488c88cd0fa4801b2af035e697efe471c9cc..392aaaa8f79553a5b38bd3a361ae3b3e1fa2e7ae 100644
--- a/content/browser/renderer_host/media/desktop_capture_device_aura.cc
+++ b/content/browser/renderer_host/media/desktop_capture_device_aura.cc
@@ -260,8 +260,12 @@ void DesktopVideoCaptureMachine::DidCopyOutput(
                                              true));
   }
   yuv_readback_pipeline_->ReadbackYUV(
-      texture_mailbox.name(), texture_mailbox.sync_point(), video_frame.get(),
-      base::Bind(&CopyOutputFinishedForVideo, start_time, capture_frame_cb,
+      texture_mailbox.mailbox(),
+      texture_mailbox.sync_point(),
+      video_frame.get(),
+      base::Bind(&CopyOutputFinishedForVideo,
+                 start_time,
+                 capture_frame_cb,
                  base::Passed(&release_callback)));
 }