extensions: tabs: set tab id to -1 for app/devtools windows

chrome/browser/extensions/extension_tab_util.h

Index: chrome/browser/extensions/extension_tab_util.h
diff --git a/chrome/browser/extensions/extension_tab_util.h b/chrome/browser/extensions/extension_tab_util.h
index d2d7fd5c7da18545a7b7266863ba8531595e4675..738dc4ee3557d4d6cab8f9815245121f04abc7ff 100644
--- a/chrome/browser/extensions/extension_tab_util.h
+++ b/chrome/browser/extensions/extension_tab_util.h
@@ -177,6 +177,10 @@ class ExtensionTabUtil {
   // successfully opened (though it may not necessarily *load*, e.g. if the
   // URL does not exist).
   static bool OpenOptionsPage(const Extension* extension, Browser* browser);
+
+  // Returns true if the given Browser can report tabs to extensions.
+  // Example of Browsers which don't support tabs include apps and devtools.
+  static bool BrowserSupportsTabs(Browser* browser);
 };
 
 }  // namespace extensions