Add a flag for the showing the Page Info dialog as a bubble. This adds stubs for all platforms.

chrome/browser/gtk/browser_window_gtk.cc

Index: chrome/browser/gtk/browser_window_gtk.cc
diff --git a/chrome/browser/gtk/browser_window_gtk.cc b/chrome/browser/gtk/browser_window_gtk.cc
index b436f60434589b2ba0b9eafe6f971fb578652639..c9950ff78073d9a4b12a9a967fbb11a8e380bc00 100644
--- a/chrome/browser/gtk/browser_window_gtk.cc
+++ b/chrome/browser/gtk/browser_window_gtk.cc
@@ -1019,7 +1019,11 @@ void BrowserWindowGtk::ShowPageInfo(Profile* profile,
                                     const GURL& url,
                                     const NavigationEntry::SSLStatus& ssl,
                                     bool show_history) {
-  browser::ShowPageInfo(window_, profile, url, ssl, show_history);
+  const CommandLine* command_line(CommandLine::ForCurrentProcess());
+  if (command_line->HasSwitch(switches::kEnableNewPageInfoBubble))
+    browser::ShowPageInfoBubble(window_, profile, url, ssl, show_history);
+  else
+    browser::ShowPageInfo(window_, profile, url, ssl, show_history);
 }
 
 void BrowserWindowGtk::ShowAppMenu() {