Improve the handling of invalidation/painting for off-screen rendering (issue #695).

git-svn-id: https://chromiumembedded.googlecode.com/svn/trunk@745 5089003a-bbd8-11dd-ad1f-f1f9622dbc98

cef1/libcef/webview_host.h

@@ -61,6 +61,8 @@ class WebViewHost : public WebWidgetHost {
   virtual void SetFocus(bool enable);
 #endif
 
+  virtual bool IsTransparent();
+
  protected:
   explicit WebViewHost(BrowserWebViewDelegate* delegate);