Use a mock WebAudioDevice only when testing

content/shell/renderer/shell_content_renderer_client.cc

 // Copyright (c) 2012 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/shell/renderer/shell_content_renderer_client.h"
 
 #include "base/callback.h"
 #include "base/command_line.h"
 #include "base/debug/debugger.h"
 #include "content/public/common/content_constants.h"
@@ skipping 129 matching lines @@
 ShellContentRendererClient::OverrideCreateMIDIAccessor(
     WebMIDIAccessorClient* client) {
   WebTestInterfaces* interfaces =
       ShellRenderProcessObserver::GetInstance()->test_interfaces();
   return interfaces->createMIDIAccessor(client);
 }
 
 WebAudioDevice*
 ShellContentRendererClient::OverrideCreateAudioDevice(
     double sample_rate) {
+  if (!CommandLine::ForCurrentProcess()->HasSwitch(switches::kDumpRenderTree))
+    return NULL;
   WebTestInterfaces* interfaces =
       ShellRenderProcessObserver::GetInstance()->test_interfaces();
   return interfaces->createAudioDevice(sample_rate);
 }
 
 WebClipboard* ShellContentRendererClient::OverrideWebClipboard() {
   if (!CommandLine::ForCurrentProcess()->HasSwitch(switches::kDumpRenderTree))
     return NULL;
   if (!clipboard_)
     clipboard_.reset(new MockWebClipboardImpl);
@@ skipping 24 matching lines @@
   if (CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kEnableBrowserPluginForAllViewTypes)) {
     // Allow BrowserPlugin if forced by command line flag. This is generally
     // true for tests.
     return true;
   }
   return ContentRendererClient::AllowBrowserPlugin(container);
 }
 
 }  // namespace content