Add ability to limit when context menu items appear with url patterns....

chrome/browser/extensions/extension_context_menu_api.h

Index: chrome/browser/extensions/extension_context_menu_api.h
===================================================================
--- chrome/browser/extensions/extension_context_menu_api.h	(revision 52866)
+++ chrome/browser/extensions/extension_context_menu_api.h	(working copy)
@@ -7,7 +7,10 @@
 
 #include "chrome/browser/extensions/extension_function.h"
 #include "chrome/browser/extensions/extension_menu_manager.h"
+#include "chrome/common/extensions/extension_extent.h"
 
+class ExtensionMenuItem;
+
 class ExtensionContextMenuFunction : public SyncExtensionFunction {
  public:
   ~ExtensionContextMenuFunction() {}
@@ -32,6 +35,17 @@
                     bool default_value,
                     bool* checked);
 
+  // Helper to read in a set of url patterns from a property with the given key
+  // name.
+  bool ParseURLPatterns(const DictionaryValue& properties,
+                        const wchar_t* key,
+                        ExtensionExtent* result);
+
+  // Reads in any document and targetUrl patterns from |properties| and sets
+  // them on |item|.
+  bool SetURLPatterns(const DictionaryValue& properties,
+                      ExtensionMenuItem* item);
+
   // If the parentId key was specified in properties, this will try looking up
   // an ExtensionMenuItem with that id and set it into |result|. Returns false
   // on error, with an explanation written into error_. Note that if the