Support invisible underline for IME composition.

ui/base/ime/input_method_chromeos.cc

Index: ui/base/ime/input_method_chromeos.cc
diff --git a/ui/base/ime/input_method_chromeos.cc b/ui/base/ime/input_method_chromeos.cc
index b3df071678876847a1e9274d6402d7e71313d299..6930968f7db6d043ea92027ce2904119914238e4 100644
--- a/ui/base/ime/input_method_chromeos.cc
+++ b/ui/base/ime/input_method_chromeos.cc
@@ -617,6 +617,9 @@ void InputMethodChromeOS::ExtractCompositionText(
       else if (underline_attributes[i].type ==
                chromeos::CompositionText::COMPOSITION_TEXT_UNDERLINE_ERROR)
         underline.color = SK_ColorRED;
+      else if (underline_attributes[i].type ==
+               chromeos::CompositionText::COMPOSITION_TEXT_UNDERLINE_NONE)
+        underline.color = SK_ColorTRANSPARENT;
       out_composition->underlines.push_back(underline);
     }
   }