Passing BackgroundColorSpan and UnderlineSpan from Clank to Blink.

content/browser/renderer_host/render_widget_host_view_mac.mm

Index: content/browser/renderer_host/render_widget_host_view_mac.mm
diff --git a/content/browser/renderer_host/render_widget_host_view_mac.mm b/content/browser/renderer_host/render_widget_host_view_mac.mm
index b6a62124b8de499a2562d975c27b5a64f8dd8a6d..e5e26e48b0ce3b83001101a52f52d792682b293e 100644
--- a/content/browser/renderer_host/render_widget_host_view_mac.mm
+++ b/content/browser/renderer_host/render_widget_host_view_mac.mm
@@ -280,7 +280,8 @@ void ExtractUnderlines(
             [colorAttr colorUsingColorSpaceName:NSDeviceRGBColorSpace]);
       }
       underlines->push_back(blink::WebCompositionUnderline(
-          range.location, NSMaxRange(range), color, [style intValue] > 1));
+          range.location, NSMaxRange(range), color, [style intValue] > 1,
+          SK_ColorTRANSPARENT));
     }
     i = range.location + range.length;
   }
@@ -3672,7 +3673,8 @@ extern NSString *NSTextInputReplacementRangeAttributeName;
   } else {
     // Use a thin black underline by default.
     underlines_.push_back(
-        blink::WebCompositionUnderline(0, length, SK_ColorBLACK, false));
+        blink::WebCompositionUnderline(0, length, SK_ColorBLACK, false,
+                                       SK_ColorTRANSPARENT));
   }
 
   // If we are handling a key down event, then SetComposition() will be