Passing BackgroundColorSpan and UnderlineSpan from Clank to Blink.

ui/base/ime/composition_text_util_pango.cc

Index: ui/base/ime/composition_text_util_pango.cc
diff --git a/ui/base/ime/composition_text_util_pango.cc b/ui/base/ime/composition_text_util_pango.cc
index 98dadb6cc407cad8042833ffd472caa0c1790e45..7a01ebdef809a6fd4665bdf4b191bceeadf4d992 100644
--- a/ui/base/ime/composition_text_util_pango.cc
+++ b/ui/base/ime/composition_text_util_pango.cc
@@ -76,7 +76,8 @@ void ExtractCompositionTextFromGtkPreedit(const gchar* utf8_text,
       if (background_attr || underline_attr) {
         // Use a black thin underline by default.
         CompositionUnderline underline(
-            char16_offsets[start], char16_offsets[end], SK_ColorBLACK, false);
+            char16_offsets[start], char16_offsets[end], SK_ColorBLACK, false,
+            SK_ColorTRANSPARENT);
 
         // Always use thick underline for a range with background color, which
         // is usually the selection range.
@@ -109,7 +110,8 @@ void ExtractCompositionTextFromGtkPreedit(const gchar* utf8_text,
   // Use a black thin underline by default.
   if (composition->underlines.empty()) {
     composition->underlines.push_back(
-        CompositionUnderline(0, length, SK_ColorBLACK, false));
+        CompositionUnderline(0, length, SK_ColorBLACK, false,
+                             SK_ColorTRANSPARENT));
   }
 }