Send ADD_TO_DICT feedback to spelling service when user adds word to dictionary

When a user of the spelling service right-clicks on a misspelled word and 
selects 'Add to dictionary', the SpellingMenuObserver notifies spelling service
feedback sender. This feedback will be used to improve spellcheck suggestions 
from spelling service.

BUG=170514

Review URL: https://chromiumcodereview.appspot.com/15736012

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@202938 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/tab_contents/spelling_menu_observer.cc

@@ -276,15 +276,17 @@ void SpellingMenuObserver::ExecuteCommand(int command_id) {
 
   if (command_id == IDC_CONTENT_CONTEXT_SPELLING_SUGGESTION ||
       command_id == IDC_SPELLCHECK_ADD_TO_DICTIONARY) {
-    // GetHostForProfile() can return null when the suggested word is
-    // provided by Web SpellCheck API.
+    // GetHostForProfile() can return null when the suggested word is provided
+    // by Web SpellCheck API.
     Profile* profile = proxy_->GetProfile();
     if (profile) {
-      SpellcheckService* spellcheck_service =
+      SpellcheckService* spellcheck =
           SpellcheckServiceFactory::GetForProfile(profile);
-      if (spellcheck_service)
-        spellcheck_service->GetCustomDictionary()->AddWord(
-            UTF16ToUTF8(misspelled_word_));
+      if (spellcheck) {
+        spellcheck->GetCustomDictionary()->AddWord(UTF16ToUTF8(
+            misspelled_word_));
+        spellcheck->GetFeedbackSender()->AddedToDictionary(misspelling_hash_);
+      }
     }
 #if defined(OS_MACOSX)
     spellcheck_mac::AddWord(misspelled_word_);