Share a common alpha value used for displaying disabled state in Harmony

ui/native_theme/common_theme.cc

Index: ui/native_theme/common_theme.cc
diff --git a/ui/native_theme/common_theme.cc b/ui/native_theme/common_theme.cc
index 4da91acea12919249415e4cf571cbdfa9b4eb434..71af8db44798ad6eb93d8815ce6e2b3ca8dde331 100644
--- a/ui/native_theme/common_theme.cc
+++ b/ui/native_theme/common_theme.cc
@@ -29,6 +29,10 @@ SkColor GetAuraColor(NativeTheme::ColorId color_id,
       // Labels
       case NativeTheme::kColorId_LabelEnabledColor:
         return kPrimaryTextColor;
+      case NativeTheme::kColorId_LabelDisabledColor:
+        return SkColorSetA(
+            base_theme->GetSystemColor(NativeTheme::kColorId_LabelEnabledColor),
+            gfx::kDisabledControlAlpha);
 
       // FocusableBorder
       case NativeTheme::kColorId_UnfocusedBorderColor:
@@ -41,7 +45,9 @@ SkColor GetAuraColor(NativeTheme::ColorId color_id,
         return base_theme->GetSystemColor(
             NativeTheme::kColorId_DialogBackground);
       case NativeTheme::kColorId_TextfieldReadOnlyColor:
-        return SkColorSetA(kPrimaryTextColor, 0x61);
+        return SkColorSetA(base_theme->GetSystemColor(
+                               NativeTheme::kColorId_TextfieldDefaultColor),
+                           gfx::kDisabledControlAlpha);
 
       default:
        break;