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_dll/cpptoc/browser_host_cpptoc.cc

@@ -411,6 +411,23 @@ int CEF_CALLBACK browser_host_is_mouse_cursor_change_disabled(
   return _retval;
 }
 
+void CEF_CALLBACK browser_host_replace_misspelling(
+    struct _cef_browser_host_t* self, const cef_string_t* word) {
+  // AUTO-GENERATED CONTENT - DELETE THIS COMMENT BEFORE MODIFYING
+
+  DCHECK(self);
+  if (!self)
+    return;
+  // Verify param: word; type: string_byref_const
+  DCHECK(word);
+  if (!word)
+    return;
+
+  // Execute
+  CefBrowserHostCppToC::Get(self)->ReplaceMisspelling(
+      CefString(word));
+}
+
 int CEF_CALLBACK browser_host_is_window_rendering_disabled(
     struct _cef_browser_host_t* self) {
   // AUTO-GENERATED CONTENT - DELETE THIS COMMENT BEFORE MODIFYING
@@ -782,6 +799,7 @@ CefBrowserHostCppToC::CefBrowserHostCppToC(CefBrowserHost* cls)
       browser_host_set_mouse_cursor_change_disabled;
   struct_.struct_.is_mouse_cursor_change_disabled =
       browser_host_is_mouse_cursor_change_disabled;
+  struct_.struct_.replace_misspelling = browser_host_replace_misspelling;
   struct_.struct_.is_window_rendering_disabled =
       browser_host_is_window_rendering_disabled;
   struct_.struct_.was_resized = browser_host_was_resized;