Workaround a nasty ibus issue.

chrome/browser/renderer_host/gtk_im_context_wrapper.h

Index: chrome/browser/renderer_host/gtk_im_context_wrapper.h
diff --git a/chrome/browser/renderer_host/gtk_im_context_wrapper.h b/chrome/browser/renderer_host/gtk_im_context_wrapper.h
index 94d6bfaeb29fb5efe5497628bac692b2d4534001..efc0875d2f43b6743b0e34693f47f77fcecf3420 100644
--- a/chrome/browser/renderer_host/gtk_im_context_wrapper.h
+++ b/chrome/browser/renderer_host/gtk_im_context_wrapper.h
@@ -70,7 +70,10 @@ class GtkIMContextWrapper {
 
   // Check if a text needs commit by forwarding a char event instead of
   // by confirming as a composition text.
-  bool NeedCommitByForwardingCharEvent();
+  bool NeedCommitByForwardingCharEvent() const;
+
+  // Check if the input method returned any result, eg. preedit and commit text.
+  bool HasInputMethodResult() const;
 
   void ProcessFilteredKeyPressEvent(NativeWebKeyboardEvent* wke);
   void ProcessUnfilteredKeyPressEvent(NativeWebKeyboardEvent* wke);
@@ -206,6 +209,12 @@ class GtkIMContextWrapper {
   // TODO(suzhe): Remove it after input methods get fixed.
   bool suppress_next_commit_;
 
+  // Information of the last key event, for working around
+  // http://crosbug.com/6582
+  int last_key_code_;
+  bool last_key_was_up_;
+  bool last_key_filtered_no_result_;
+
   DISALLOW_COPY_AND_ASSIGN(GtkIMContextWrapper);
 };