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/render_handler_cpptoc.cc

@@ -315,6 +315,23 @@ void CEF_CALLBACK render_handler_update_drag_cursor(
       operation);
 }
 
+void CEF_CALLBACK render_handler_on_scroll_offset_changed(
+    struct _cef_render_handler_t* self, cef_browser_t* browser) {
+  // AUTO-GENERATED CONTENT - DELETE THIS COMMENT BEFORE MODIFYING
+
+  DCHECK(self);
+  if (!self)
+    return;
+  // Verify param: browser; type: refptr_diff
+  DCHECK(browser);
+  if (!browser)
+    return;
+
+  // Execute
+  CefRenderHandlerCppToC::Get(self)->OnScrollOffsetChanged(
+      CefBrowserCToCpp::Wrap(browser));
+}
+
 
 // CONSTRUCTOR - Do not edit by hand.
 
@@ -331,6 +348,8 @@ CefRenderHandlerCppToC::CefRenderHandlerCppToC(CefRenderHandler* cls)
   struct_.struct_.on_cursor_change = render_handler_on_cursor_change;
   struct_.struct_.start_dragging = render_handler_start_dragging;
   struct_.struct_.update_drag_cursor = render_handler_update_drag_cursor;
+  struct_.struct_.on_scroll_offset_changed =
+      render_handler_on_scroll_offset_changed;
 }
 
 #ifndef NDEBUG