Background tracing: Enable field-trial control on Android

chrome/browser/chrome_content_browser_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 "chrome/browser/chrome_content_browser_client.h"
 
 #include <map>
 #include <set>
 #include <utility>
 #include <vector>
@@ skipping 2905 matching lines @@
 
   return throttles;
 }
 
 content::DevToolsManagerDelegate*
 ChromeContentBrowserClient::GetDevToolsManagerDelegate() {
   return new ChromeDevToolsManagerDelegate();
 }
 
 content::TracingDelegate* ChromeContentBrowserClient::GetTracingDelegate() {
-#if !defined(OS_ANDROID)
   return new ChromeTracingDelegate();
-#else
-  return nullptr;
-#endif
 }
 
 bool ChromeContentBrowserClient::IsPluginAllowedToCallRequestOSFileHandle(
     content::BrowserContext* browser_context,
     const GURL& url) {
 #if defined(ENABLE_PLUGINS) && defined(ENABLE_EXTENSIONS)
   return ChromeContentBrowserClientPluginsPart::
       IsPluginAllowedToCallRequestOSFileHandle(browser_context, url,
                                                allowed_file_handle_origins_);
 #else
@@ skipping 47 matching lines @@
   if (channel <= kMaxDisableEncryptionChannel) {
     static const char* const kWebRtcDevSwitchNames[] = {
       switches::kDisableWebRtcEncryption,
     };
     to_command_line->CopySwitchesFrom(from_command_line,
                                       kWebRtcDevSwitchNames,
                                       arraysize(kWebRtcDevSwitchNames));
   }
 }
 #endif  // defined(ENABLE_WEBRTC)