Add run-time enable support for the web audio API...

chrome/browser/tab_contents/render_view_host_delegate_helper.cc

 // Copyright (c) 2010 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 "chrome/browser/tab_contents/render_view_host_delegate_helper.h"
 
 #include <string>
 
 #include "base/command_line.h"
 #include "base/string_util.h"
@@ skipping 255 matching lines @@
         !command_line.HasSwitch(switches::kDisableRemoteFonts);
     web_prefs.xss_auditor_enabled =
         command_line.HasSwitch(switches::kEnableXSSAuditor);
     web_prefs.application_cache_enabled =
         !command_line.HasSwitch(switches::kDisableApplicationCache);
 
     web_prefs.local_storage_enabled =
         !command_line.HasSwitch(switches::kDisableLocalStorage);
     web_prefs.databases_enabled =
         !command_line.HasSwitch(switches::kDisableDatabases);
+    web_prefs.webaudio_enabled =
+        command_line.HasSwitch(switches::kEnableWebAudio);
     web_prefs.experimental_webgl_enabled =
         gpu_enabled() &&
         !command_line.HasSwitch(switches::kDisable3DAPIs) &&
         !command_line.HasSwitch(switches::kDisableExperimentalWebGL);
     web_prefs.site_specific_quirks_enabled =
         !command_line.HasSwitch(switches::kDisableSiteSpecificQuirks);
     web_prefs.allow_file_access_from_file_urls =
         command_line.HasSwitch(switches::kAllowFileAccessFromFiles);
     web_prefs.show_composited_layer_borders =
         command_line.HasSwitch(switches::kShowCompositedLayerBorders);
@@ skipping 54 matching lines @@
   inspector_settings->SetWithoutPathExpansion(key,
                                               Value::CreateStringValue(value));
 }
 
 void RenderViewHostDelegateHelper::ClearInspectorSettings(Profile* profile) {
   DictionaryValue* inspector_settings =
       profile->GetPrefs()->GetMutableDictionary(
           prefs::kWebKitInspectorSettings);
   inspector_settings->Clear();
 }