Disable Mac AVFoundation for WebRTC browser tests.

chrome/browser/media/chrome_webrtc_video_quality_browsertest.cc

 // Copyright 2013 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.
 
 #include "base/environment.h"
 #include "base/file_util.h"
 #include "base/path_service.h"
 #include "base/process/launch.h"
 #include "base/strings/string_split.h"
 #include "base/strings/stringprintf.h"
@@ skipping 94 matching lines @@
     DetectErrorsInJavaScript();  // Look for errors in our rather complex js.
   }
 
   virtual void SetUpCommandLine(CommandLine* command_line) OVERRIDE {
     // This test expects real device handling and requires a real webcam / audio
     // device; it will not work with fake devices.
     EXPECT_FALSE(
         command_line->HasSwitch(switches::kUseFakeDeviceForMediaStream))
         << "You cannot run this test with fake devices.";
 
+#if defined(OS_MACOSX)
+    // TODO(mcasas): Remove this switch when ManyCam virtual video capture
+    // device starts supporting AVFoundation, see http://crbug.com/327618.
+    command_line->AppendSwitch(switches::kDisableAVFoundation);
+#endif
+
     // The video playback will not work without a GPU, so force its use here.
     command_line->AppendSwitch(switches::kUseGpuInTests);
   }
 
   bool HasAllRequiredResources() {
     if (!base::PathExists(GetWorkingDir())) {
       LOG(ERROR) << "Cannot find the working directory for the reference video "
           "and the temporary files:" << GetWorkingDir().value();
       return false;
     }
@@ skipping 242 matching lines @@
 
   RunARGBtoI420Converter(
       kVgaWidth, kVgaHeight, GetWorkingDir().Append(kCapturedYuvFileName));
   ASSERT_TRUE(
       CompareVideosAndPrintResult(kVgaWidth,
                                   kVgaHeight,
                                   GetWorkingDir().Append(kCapturedYuvFileName),
                                   GetWorkingDir().Append(kReferenceYuvFileName),
                                   GetWorkingDir().Append(kStatsFileName)));
 }