A quick fix for Issue 15531 and 10953...

chrome/browser/renderer_host/render_widget_host_view_gtk.h

 // Copyright (c) 2006-2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_GTK_H_
 #define CHROME_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_GTK_H_
 
 #include <gdk/gdk.h>
 #include <vector>
 
@@ skipping 114 matching lines @@
   // composed by an IME.
   GtkIMContext* im_context_;
 
   // Whether or not the above GtkIMContext is composing a CJK text with an IME.
   // The GtkIMContext object sends a "preedit_start" before it starts composing
   // a CJK text and a "preedit_end" signal after it finishes composing it.
   // On the other hand, the GtkIMContext object doesn't send them when
   // composing Latin texts. So, we monitor the above signals to check whether
   // or not the GtkIMContext object is composing a CJK text.
   bool im_is_composing_cjk_text_;
+
+  // Represents the current modifier-key state.
+  // This state is used when GtkIMContext signal handlers create Char events
+  // because they don't use the GdkEventKey objects and cannot get the state.
+  int im_modifier_state_;
 };
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_GTK_H_