Add ExtendSelectionAndDelete handler in WebPlugin

Source/web/WebViewImpl.cpp

 /*
  * Copyright (C) 2011, 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 2414 matching lines @@
     WebVector<WebCompositionUnderline> results(underlines.size());
     for (size_t index = 0; index < underlines.size(); ++index) {
         CompositionUnderline underline = underlines[index];
         results[index] = WebCompositionUnderline(underline.startOffset, underline.endOffset, static_cast<WebColor>(underline.color.rgb()), underline.thick);
     }
     return results;
 }
 
 void WebViewImpl::extendSelectionAndDelete(int before, int after)
 {
-    const Frame* focused = focusedWebCoreFrame();
+    Frame* focused = focusedWebCoreFrame();
     if (!focused)
         return;
+    if (WebPlugin* plugin = focusedPluginIfInputMethodSupported(focused)) {
+        plugin->extendSelectionAndDelete(before, after);
+        return;
+    }
     focused->inputMethodController().extendSelectionAndDelete(before, after);
 }
 
 bool WebViewImpl::isSelectionEditable() const
 {
     if (const Frame* frame = focusedWebCoreFrame())
         return frame->selection().isContentEditable();
     return false;
 }
 
@@ skipping 1744 matching lines @@
     const PageScaleConstraints& constraints = m_pageScaleConstraintsSet.pageDefinedConstraints();
 
     if (!mainFrameImpl() || !mainFrameImpl()->frameView())
         return false;
 
     return mainFrameImpl()->frameView()->layoutSize().width() == m_size.width
         || (constraints.minimumScale == constraints.maximumScale && constraints.minimumScale != -1);
 }
 
 } // namespace blink