Allow IO thread usage in WebRTC browsertests

chrome/browser/media/webrtc/webrtc_video_quality_browsertest.cc

Index: chrome/browser/media/webrtc/webrtc_video_quality_browsertest.cc
diff --git a/chrome/browser/media/webrtc/webrtc_video_quality_browsertest.cc b/chrome/browser/media/webrtc/webrtc_video_quality_browsertest.cc
index f7931d2570e33f09a7e91a06348ee37e48a5c5b4..5b941d66568ac80af37ec16179b5fb8af7da338b 100644
--- a/chrome/browser/media/webrtc/webrtc_video_quality_browsertest.cc
+++ b/chrome/browser/media/webrtc/webrtc_video_quality_browsertest.cc
@@ -39,6 +39,10 @@
 #include "testing/perf/perf_test.h"
 #include "ui/gl/gl_switches.h"
 
+#if defined(OS_MACOSX)
+#include "base/threading/thread_restrictions.h"
+#endif  // defined(OS_MACOSX)
+
 namespace {
 std::string MakeLabel(const char* test_name, const std::string& video_codec) {
   std::string codec_label = video_codec.empty() ? "" : "_" + video_codec;
@@ -344,11 +348,19 @@ INSTANTIATE_TEST_CASE_P(
 
 IN_PROC_BROWSER_TEST_P(WebRtcVideoQualityBrowserTest,
                        MANUAL_TestVideoQualityVp8) {
+// crbug.com/684680
+#if defined(OS_MACOSX)
+  base::ThreadRestrictions::ScopedAllowIO allow_io;
+#endif  // defined(OS_MACOSX)
   TestVideoQuality("VP8");
 }
 
 IN_PROC_BROWSER_TEST_P(WebRtcVideoQualityBrowserTest,
                        MANUAL_TestVideoQualityVp9) {
+// crbug.com/684680
+#if defined(OS_MACOSX)
+  base::ThreadRestrictions::ScopedAllowIO allow_io;
+#endif  // defined(OS_MACOSX)
   TestVideoQuality("VP9");
 }
 
@@ -356,6 +368,10 @@ IN_PROC_BROWSER_TEST_P(WebRtcVideoQualityBrowserTest,
 
 IN_PROC_BROWSER_TEST_P(WebRtcVideoQualityBrowserTest,
                        MANUAL_TestVideoQualityH264) {
+// crbug.com/684680
+#if defined(OS_MACOSX)
+  base::ThreadRestrictions::ScopedAllowIO allow_io;
+#endif  // defined(OS_MACOSX)
   // Only run test if run-time feature corresponding to |rtc_use_h264| is on.
   if (!base::FeatureList::IsEnabled(content::kWebRtcH264WithOpenH264FFmpeg)) {
     LOG(WARNING) << "Run-time feature WebRTC-H264WithOpenH264FFmpeg disabled. "