Disable audio output for media browser_tests on Linux

Due to problems on some bots failing to start PulseAudio and causing
Chrome startup to hang, disabling audio output for media browser tests
on Linux to avoid the hang.

Bug: 986021,1023029,1026849,1035472,1049467
Test: modified browser_tests pass locally
Change-Id: I29a996ee627bc4a5b93e5b8d6227dd7801998d11
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2056760Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: John Rummell <jrummell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#741613}

chrome/browser/media/media_browsertest.cc

@@ -30,6 +30,11 @@ void MediaBrowserTest::SetUpCommandLine(base::CommandLine* command_line) {
   command_line->AppendSwitchASCII(
       switches::kAutoplayPolicy,
       switches::autoplay::kNoUserGestureRequiredPolicy);
+#if defined(OS_LINUX)
+  // Due to problems with PulseAudio failing to start, use a fake audio
+  // stream. crbug.com/1047655#c70
+  command_line->AppendSwitch(switches::kDisableAudioOutput);
+#endif
 
   std::vector<base::Feature> enabled_features = {
 #if defined(OS_ANDROID)
@@ -41,12 +46,6 @@ void MediaBrowserTest::SetUpCommandLine(base::CommandLine* command_line) {
     // Disable fallback after decode error to avoid unexpected test pass on
     // the fallback path.
     media::kFallbackAfterDecodeError,
-
-#if defined(OS_LINUX)
-    // Disable out of process audio on Linux due to process spawn
-    // failures. http://crbug.com/986021
-    features::kAudioServiceOutOfProcess,
-#endif
   };
 
   scoped_feature_list_.InitWithFeatures(enabled_features, disabled_features);

content/browser/media/media_browsertest.cc

@@ -35,6 +35,11 @@ void MediaBrowserTest::SetUpCommandLine(base::CommandLine* command_line) {
       switches::kAutoplayPolicy,
       switches::autoplay::kNoUserGestureRequiredPolicy);
   command_line->AppendSwitch(switches::kExposeInternalsForTesting);
+#if defined(OS_LINUX)
+  // Due to problems with PulseAudio failing to start, use a fake audio
+  // stream. crbug.com/1047655#c70
+  command_line->AppendSwitch(switches::kDisableAudioOutput);
+#endif
 
   std::vector<base::Feature> enabled_features = {
 #if defined(OS_ANDROID)
@@ -46,12 +51,6 @@ void MediaBrowserTest::SetUpCommandLine(base::CommandLine* command_line) {
     // Disable fallback after decode error to avoid unexpected test pass on
     // the fallback path.
     media::kFallbackAfterDecodeError,
-
-#if defined(OS_LINUX)
-    // Disable out of process audio on Linux due to process spawn
-    // failures. http://crbug.com/986021
-    features::kAudioServiceOutOfProcess,
-#endif
   };
 
   scoped_feature_list_.InitWithFeatures(enabled_features, disabled_features);