Set keyboard mic effect if available.

content/test/webrtc_content_browsertest_base.cc

Index: content/test/webrtc_content_browsertest_base.cc
diff --git a/content/test/webrtc_content_browsertest_base.cc b/content/test/webrtc_content_browsertest_base.cc
index b2885dbc8d5490bbf18fb6f263a440e2871be7a0..db83501971f94d6d57e18bd42ceb669a5308e2e9 100644
--- a/content/test/webrtc_content_browsertest_base.cc
+++ b/content/test/webrtc_content_browsertest_base.cc
@@ -13,6 +13,10 @@
 #include "content/shell/browser/shell.h"
 #include "media/base/media_switches.h"
 
+#if defined(OS_CHROMEOS)
+#include "chromeos/audio/cras_audio_handler.h"
+#endif
+
 namespace content {
 
 void WebRtcContentBrowserTest::SetUpCommandLine(CommandLine* command_line) {
@@ -31,9 +35,19 @@ void WebRtcContentBrowserTest::SetUpCommandLine(CommandLine* command_line) {
 
 void WebRtcContentBrowserTest::SetUp() {
   EnablePixelOutput();
+#if defined(OS_CHROMEOS)
+    chromeos::CrasAudioHandler::InitializeForTesting();
+#endif
   ContentBrowserTest::SetUp();
 }
 
+void WebRtcContentBrowserTest::TearDown() {
+  ContentBrowserTest::TearDown();
+#if defined(OS_CHROMEOS)
+    chromeos::CrasAudioHandler::Shutdown();
+#endif
+}
+
 // Executes |javascript|. The script is required to use
 // window.domAutomationController.send to send a string value back to here.
 std::string WebRtcContentBrowserTest::ExecuteJavascriptAndReturnResult(