Wait showing html dialog until renderer finish painting after page is loaded.

views/widget/native_widget_gtk.h

Index: views/widget/native_widget_gtk.h
diff --git a/views/widget/native_widget_gtk.h b/views/widget/native_widget_gtk.h
index 260329883b33f03ce9fdf48aa2a8dc5775778efb..f080b10e8f1403c9310ff1962b3283b2ac8d7650 100644
--- a/views/widget/native_widget_gtk.h
+++ b/views/widget/native_widget_gtk.h
@@ -108,7 +108,7 @@ class NativeWidgetGtk : public NativeWidget,
   void GetRequestedSize(gfx::Size* out) const;
 
   // Overridden from ui::ActiveWindowWatcherX::Observer.
-  virtual void ActiveWindowChanged(GdkWindow* active_window);
+  virtual void ActiveWindowChanged(GdkWindow* active_window) OVERRIDE;
 
   // Clears the focus on the native widget having the focus.
   virtual void ClearNativeFocus();
@@ -117,6 +117,13 @@ class NativeWidgetGtk : public NativeWidget,
   // Returns true if it's handled by the focus manager.
   bool HandleKeyboardEvent(const KeyEvent& key);
 
+  // Tells widget not to remove FREEZE_UPDATES property when the
+  // widget is painted.  This is used if painting the gtk widget
+  // is not enough to show the window and has to wait further like
+  // keyboard overlay. Returns true if this is called before
+  // FREEZE_UPDATES property is removed, or false otherwise.
+  bool SuppressFreezeUpdates();
+
   // Enables debug painting. See |debug_paint_enabled_| for details.
   static void EnableDebugPaint();