Relanding WebRTC real webcam browsertest for Android.

content/test/webrtc_content_browsertest_base.cc

 // Copyright 2014 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 "content/test/webrtc_content_browsertest_base.h"
 
 #include "base/command_line.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/test/browser_test_utils.h"
 #include "content/public/test/content_browser_test_utils.h"
 #include "content/shell/browser/shell.h"
 #include "media/base/media_switches.h"
 
 #if defined(OS_CHROMEOS)
 #include "chromeos/audio/cras_audio_handler.h"
 #endif
 
 #if defined(OS_WIN)
 #include "base/win/windows_version.h"
 #endif
 
 namespace content {
 
 void WebRtcContentBrowserTest::SetUpCommandLine(CommandLine* command_line) {
-  // We need fake devices in this test since we want to run on naked VMs. We
-  // assume these switches are set by default in content_browsertests.
+  // Assume this is set by the content test launcher.
+  ASSERT_TRUE(CommandLine::ForCurrentProcess()->HasSwitch(
+      switches::kUseFakeUIForMediaStream));
   ASSERT_TRUE(CommandLine::ForCurrentProcess()->HasSwitch(
       switches::kUseFakeDeviceForMediaStream));
-  ASSERT_TRUE(CommandLine::ForCurrentProcess()->HasSwitch(
-      switches::kUseFakeUIForMediaStream));
 
   // Always include loopback interface in network list, in case the test device
   // doesn't have other interfaces available.
   CommandLine::ForCurrentProcess()->AppendSwitch(
       switches::kAllowLoopbackInPeerConnection);
 }
 
 void WebRtcContentBrowserTest::SetUp() {
+  // We need pixel output when we dig pixels out of video tags for verification.
   EnablePixelOutput();
 #if defined(OS_CHROMEOS)
     chromeos::CrasAudioHandler::InitializeForTesting();
 #endif
   ContentBrowserTest::SetUp();
 }
 
 void WebRtcContentBrowserTest::TearDown() {
   ContentBrowserTest::TearDown();
 #if defined(OS_CHROMEOS)
@@ skipping 52 matching lines @@
 
 bool WebRtcContentBrowserTest::OnWinXp() const {
 #if defined(OS_WIN)
   return base::win::GetVersion() <= base::win::VERSION_XP;
 #else
   return false;
 #endif
 }
 
 }  // namespace content