Functionality has been requested in the Extension API for Javascript to...

chrome/browser/extensions/extension_tabs_module_constants.h

Index: chrome/browser/extensions/extension_tabs_module_constants.h
===================================================================
--- chrome/browser/extensions/extension_tabs_module_constants.h	(revision 20805)
+++ chrome/browser/extensions/extension_tabs_module_constants.h	(working copy)
@@ -46,6 +46,7 @@
 extern const char kTabNotFoundError[];
 extern const char kNoSelectedTabError[];
 extern const char kInvalidUrlError[];
+extern const char kInternalVisibleTabCaptureError[];
 
 // Function names, Windows API.
 extern const char kGetWindowFunction[];
@@ -65,6 +66,7 @@
 extern const char kMoveTabFunction[];
 extern const char kRemoveTabFunction[];
 extern const char kGetTabLanguageFunction[];
+extern const char kGetVisibleTabCaptureFunction[];
 
 };  // namespace extension_tabs_module_constants