Allow IO thread usage in WebRTC browsertests

chrome/browser/media/webrtc/webrtc_audio_quality_browsertest.cc

Index: chrome/browser/media/webrtc/webrtc_audio_quality_browsertest.cc
diff --git a/chrome/browser/media/webrtc/webrtc_audio_quality_browsertest.cc b/chrome/browser/media/webrtc/webrtc_audio_quality_browsertest.cc
index 8107494b852a4fe7df29dbdfdbec0877ab1eee6a..894f45ec8e01aecdfdbe9db56aae3b235cb101c7 100644
--- a/chrome/browser/media/webrtc/webrtc_audio_quality_browsertest.cc
+++ b/chrome/browser/media/webrtc/webrtc_audio_quality_browsertest.cc
@@ -18,6 +18,7 @@
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
+#include "base/threading/thread_restrictions.h"
 #include "build/build_config.h"
 #include "chrome/browser/media/webrtc/webrtc_browsertest_audio.h"
 #include "chrome/browser/media/webrtc/webrtc_browsertest_base.h"
@@ -681,11 +682,13 @@ void MAYBE_WebRtcAudioQualityBrowserTest::TestWithFakeDeviceGetUserMedia(
 
 IN_PROC_BROWSER_TEST_F(MAYBE_WebRtcAudioQualityBrowserTest,
                        MANUAL_TestCallQualityWithAudioFromFakeDevice) {
+  base::ThreadRestrictions::ScopedAllowIO allow_io;
   TestWithFakeDeviceGetUserMedia(kAudioOnlyCallConstraints, "_getusermedia");
 }
 
 IN_PROC_BROWSER_TEST_F(MAYBE_WebRtcAudioQualityBrowserTest,
                        MANUAL_TestCallQualityWithAudioFromWebAudio) {
+  base::ThreadRestrictions::ScopedAllowIO allow_io;
   if (OnWin8()) {
     // http://crbug.com/379798.
     LOG(ERROR) << "This test is not implemented for Windows XP/Win8.";
@@ -801,6 +804,7 @@ void MAYBE_WebRtcAudioQualityBrowserTest::TestAutoGainControl(
 // The AGC should apply non-zero gain here.
 IN_PROC_BROWSER_TEST_F(MAYBE_WebRtcAudioQualityBrowserTest,
                        MANUAL_TestAutoGainControlOnLowAudio) {
+  base::ThreadRestrictions::ScopedAllowIO allow_io;
   ASSERT_NO_FATAL_FAILURE(TestAutoGainControl(
       kReferenceFile, kAudioOnlyCallConstraints, "_with_agc"));
 }
@@ -808,6 +812,7 @@ IN_PROC_BROWSER_TEST_F(MAYBE_WebRtcAudioQualityBrowserTest,
 // Since the AGC is off here there should be no gain at all.
 IN_PROC_BROWSER_TEST_F(MAYBE_WebRtcAudioQualityBrowserTest,
                        MANUAL_TestAutoGainIsOffWithAudioProcessingOff) {
+  base::ThreadRestrictions::ScopedAllowIO allow_io;
   const char* kAudioCallWithoutAudioProcessing =
       "{audio: { mandatory: { echoCancellation: false } } }";
   ASSERT_NO_FATAL_FAILURE(TestAutoGainControl(