views: Support configuration of initial window show state

Known issues:
- Exiting full-screen mode currently crashes with the Chrome runtime
  (see issue #3182).

include/views/cef_window_delegate.h

@@ -91,6 +91,14 @@ class CefWindowDelegate : public CefPanelDelegate {
     return CefRect();
   }
 
+  ///
+  // Return the initial show state for |window|.
+  ///
+  /*--cef(default_retval=CEF_SHOW_STATE_NORMAL)--*/
+  virtual cef_show_state_t GetInitialShowState(CefRefPtr<CefWindow> window) {
+    return CEF_SHOW_STATE_NORMAL;
+  }
+
   ///
   // Return true if |window| should be created without a frame or title bar. The
   // window will be resizable if CanResize() returns true. Use