Disable flaky Webrtc/ConnectionTest.Audio on Linux/ChromeOS

remoting/protocol/connection_unittest.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #define _USE_MATH_DEFINES // For VC++ to get M_PI. This has to be first.
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/macros.h"
@@ skipping 604 matching lines @@
                 stats.host_stats.capture_delay +
                 stats.host_stats.capture_overhead_delay +
                 stats.host_stats.encode_delay +
                 stats.host_stats.send_pending_delay,
             stats.client_stats.time_received);
   EXPECT_LE(stats.client_stats.time_received, stats.client_stats.time_decoded);
   EXPECT_LE(stats.client_stats.time_decoded, stats.client_stats.time_rendered);
   EXPECT_LE(stats.client_stats.time_rendered, finish_time);
 }
 
-// Disabling due to failures after WebRTC roll http://crbug.com/685910
+// Flaky on Linux/ChromeOS, crbug.com/685910.
+// Note: Apparently it's not possible to use the common MAYBE_ prefix with
+// TEST_P, so ifdef it out completely.
+#if !defined(OS_LINUX) && !defined(OS_CHROMEOS)
 TEST_P(ConnectionTest, Audio) {
   Connect();
 
   std::unique_ptr<AudioStream> audio_stream =
       host_connection_->StartAudioStream(base::MakeUnique<TestAudioSource>());
 
   // Wait for 1 second worth of audio samples.
   client_audio_player_.WaitForSamples(kAudioSampleRate * 2);
   client_audio_player_.Verify();
 }
+#endif
 
 TEST_P(ConnectionTest, FirstCaptureFailed) {
   Connect();
 
   base::TimeTicks event_timestamp = base::TimeTicks::FromInternalValue(42);
 
   scoped_refptr<InputEventTimestampsSourceImpl> input_event_timestamps_source =
       new InputEventTimestampsSourceImpl();
   input_event_timestamps_source->OnEventReceived(
       InputEventTimestamps{event_timestamp, base::TimeTicks::Now()});
@@ skipping 27 matching lines @@
   auto capturer = base::MakeUnique<TestScreenCapturer>();
   capturer->FailNthFrame(1);
   auto video_stream = host_connection_->StartVideoStream(std::move(capturer));
 
   WaitNextVideoFrame();
   WaitNextVideoFrame();
 }
 
 }  // namespace protocol
 }  // namespace remoting