[Chromecast] Add net logging.

chromecast/browser/cast_browser_main_parts.h

Index: chromecast/browser/cast_browser_main_parts.h
diff --git a/chromecast/browser/cast_browser_main_parts.h b/chromecast/browser/cast_browser_main_parts.h
index 49954cef55d7192bec9174008058f97684b0478e..4b5b5d8dfb9bdcfcba6cd59d9ba23ab10ffcaab9 100644
--- a/chromecast/browser/cast_browser_main_parts.h
+++ b/chromecast/browser/cast_browser_main_parts.h
@@ -15,6 +15,10 @@ namespace media {
 class AudioManagerFactory;
 }
 
+namespace net {
+class NetLog;
+}
+
 namespace chromecast {
 namespace shell {
 class CastBrowserProcess;
@@ -42,6 +46,7 @@ class CastBrowserMainParts : public content::BrowserMainParts {
   const content::MainFunctionParams parameters_;  // For running browser tests.
   URLRequestContextFactory* const url_request_context_factory_;
   scoped_ptr<::media::AudioManagerFactory> audio_manager_factory_;
+  scoped_ptr<net::NetLog> net_log_;
 
   DISALLOW_COPY_AND_ASSIGN(CastBrowserMainParts);
 };