Send IGNORE feedback to spellcheck service when user cancels spellcheck menu

chrome/browser/tab_contents/spelling_menu_observer.h

Index: chrome/browser/tab_contents/spelling_menu_observer.h
diff --git a/chrome/browser/tab_contents/spelling_menu_observer.h b/chrome/browser/tab_contents/spelling_menu_observer.h
index 03c2c4ed3bc631c01086dab8f171dedecd079bbb..f2bdbb0826bed0c4bd037dd307fe3eb8445de8e8 100644
--- a/chrome/browser/tab_contents/spelling_menu_observer.h
+++ b/chrome/browser/tab_contents/spelling_menu_observer.h
@@ -48,6 +48,7 @@ class SpellingMenuObserver : public RenderViewContextMenuObserver {
   virtual bool IsCommandIdChecked(int command_id) OVERRIDE;
   virtual bool IsCommandIdEnabled(int command_id) OVERRIDE;
   virtual void ExecuteCommand(int command_id) OVERRIDE;
+  virtual void OnMenuCancel() OVERRIDE;
 
   // A callback function called when the Spelling service finishes checking a
   // misspelled word.
@@ -87,6 +88,10 @@ class SpellingMenuObserver : public RenderViewContextMenuObserver {
   // this word to the custom-word dictionary.
   string16 misspelled_word_;
 
+  // The hash identifier for the misspelled word. Used for collecting user
+  // feedback to spellcheck suggestions.
+  uint32 misspelling_hash_;
+
   // The string representing the result of this call. This string is a
   // suggestion when this call finished successfully. Otherwise it is error
   // text. Until we receive a response from the Spelling service, this string