Add spell checking support (issue #137).

This includes:
- Red underline of misspelled words in html text areas.
- Right-click context menu options to correct the misspelled word.
- New CefBrowser::ReplaceMisspelling method for accepting a word replacement.
- Methods added to CefContextMenuParams for retrieving spelling-related information.
- Uses the unified text checker when auto-correct is not enabled to match Google Chrome behavior.
- On Windows and Linux a hunspell dictionary file will be downloaded to the "<cache_path>/Dictionaries" directory as needed, or used from the <cache_path> directory if the file already exists there. The dictionary file will be downloaded from http://cache.pack.google.com/edgedl/chrome/dict/<LANG>-3-0.bdic where <LANG> is the language abbreviation.
- On OS X the spell checking implementation will use the system NSSpellChecker implementation.

The following command-line flags have been added:
--disable-spell-checking => Disable spell-checking support (no red underline, no dictionary file download, etc).
--enable-spelling-auto-correct => Automatically correct common misspellings while typing (like 'omre' to 'more' on Windows/Linux or 'ehlo' to 'helo' on OS X).
--enable-spelling-service => Enable use of the remote Google spelling service (this requires Google API keys).
--override-spell-check-lang=<LANG> => Use the specified dictionary language <LANG> instead of the language specified in the locales.pak file. To see the default/supported dictionary languages: https://code.google.com/p/chromium/codesearch#search/&q=IDS_SPELLCHECK_DICTIONARY%20xtb&sq=package:chromium


git-svn-id: https://chromiumembedded.googlecode.com/svn/trunk@1859 5089003a-bbd8-11dd-ad1f-f1f9622dbc98

libcef/browser/menu_creator.cc

@@ -231,6 +231,26 @@ void CefMenuCreator::CreateDefaultModel() {
       model_->SetEnabled(MENU_ID_DELETE, false);
     if (!(params_.edit_flags & CM_EDITFLAG_CAN_SELECT_ALL))
       model_->SetEnabled(MENU_ID_SELECT_ALL, false);
+
+    if(!params_.misspelled_word.empty()) {
+      if (!params_.dictionary_suggestions.empty())
+        model_->AddSeparator();
+
+      for (size_t i = 0;
+           i < params_.dictionary_suggestions.size() &&
+               MENU_ID_SPELLCHECK_SUGGESTION_0 + i <=
+                  MENU_ID_SPELLCHECK_SUGGESTION_LAST;
+           ++i) {
+        model_->AddItem(MENU_ID_SPELLCHECK_SUGGESTION_0 + static_cast<int>(i),
+            params_.dictionary_suggestions[i].c_str());
+      }
+
+      if (params_.dictionary_suggestions.empty()) {
+        model_->AddItem(
+            MENU_ID_NO_SPELLING_SUGGESTIONS,
+            GetLabel(IDS_MENU_NO_SPELLING_SUGGESTIONS));
+      }
+    }
   } else if (!params_.selection_text.empty()) {
     // Something is selected.
     model_->AddItem(MENU_ID_COPY, GetLabel(IDS_MENU_COPY));
@@ -251,6 +271,18 @@ void CefMenuCreator::CreateDefaultModel() {
 }
 
 void CefMenuCreator::ExecuteDefaultCommand(int command_id) {
+  // If the user chose a replacement word for a misspelling, replace it here.
+  if (command_id >= MENU_ID_SPELLCHECK_SUGGESTION_0 &&
+      command_id <= MENU_ID_SPELLCHECK_SUGGESTION_LAST) {
+    const size_t suggestion_index =
+        static_cast<size_t>(command_id) - MENU_ID_SPELLCHECK_SUGGESTION_0;
+    if (suggestion_index < params_.dictionary_suggestions.size()) {
+      browser_->ReplaceMisspelling(
+          params_.dictionary_suggestions[suggestion_index]);
+    }
+    return;
+  }
+
   switch (command_id) {
   // Navigation.
   case MENU_ID_BACK: