Passing BackgroundColorSpan and UnderlineSpan from Clank to Blink.

ui/base/ime/win/imm32_manager.cc

Index: ui/base/ime/win/imm32_manager.cc
diff --git a/ui/base/ime/win/imm32_manager.cc b/ui/base/ime/win/imm32_manager.cc
index e1c9e9a29028417967c9049fc0a779625fc2e1c5..021e7e606651b92c5dc5eb125d68f0e8bfdee29b 100644
--- a/ui/base/ime/win/imm32_manager.cc
+++ b/ui/base/ime/win/imm32_manager.cc
@@ -83,6 +83,7 @@ void GetCompositionUnderlines(HIMC imm_context,
         underline.end_offset = clause_data[i+1];
         underline.color = SK_ColorBLACK;
         underline.thick = false;
+        underline.background_color = SK_ColorTRANSPARENT;
 
         // Use thick underline for the target clause.
         if (underline.start_offset >= static_cast<unsigned>(target_start) &&
@@ -342,6 +343,7 @@ void IMM32Manager::GetCompositionInfo(HIMC imm_context, LPARAM lparam,
   if (!composition->underlines.size()) {
     CompositionUnderline underline;
     underline.color = SK_ColorBLACK;
+    underline.background_color = SK_ColorTRANSPARENT;
     if (target_start > 0) {
       underline.start_offset = 0;
       underline.end_offset = target_start;