Support invisible underline for IME composition.

chromeos/ime/composition_text.h

 // Copyright 2014 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 CHROMEOS_IME_COMPOSITION_TEXT_H_
 #define CHROMEOS_IME_COMPOSITION_TEXT_H_
 
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/strings/string16.h"
 #include "chromeos/chromeos_export.h"
 
 namespace chromeos {
 
 class CHROMEOS_EXPORT CompositionText {
  public:
   enum UnderlineType {
     COMPOSITION_TEXT_UNDERLINE_SINGLE = 1,
     COMPOSITION_TEXT_UNDERLINE_DOUBLE = 2,
-    COMPOSITION_TEXT_UNDERLINE_ERROR  = 4,
+    COMPOSITION_TEXT_UNDERLINE_NONE = 4,

[Seigo Nonaka, 2014/10/13 06:23:10]

nit: this value is no longer being unique bit values(1,2,4,8).
Could you change simply incremental values(0,1,2,3)?
This value is originally from iBus protocol.

+    COMPOSITION_TEXT_UNDERLINE_ERROR = 8,
   };
 
   struct UnderlineAttribute {
     UnderlineType type;
     uint32 start_index;  // The inclusive start index.
     uint32 end_index;  // The exclusive end index.
   };
 
   CompositionText();
   virtual ~CompositionText();
@@ skipping 27 matching lines @@
   std::vector<UnderlineAttribute> underline_attributes_;
   uint32 selection_start_;
   uint32 selection_end_;
 
   DISALLOW_COPY_AND_ASSIGN(CompositionText);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_IME_COMPOSITION_TEXT_H_