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

ui/native_theme/common_theme.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/native_theme/common_theme.h"
 
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
 #include "third_party/skia/include/core/SkCanvas.h"
 #include "ui/base/material_design/material_design_controller.h"
@@ skipping 11 matching lines @@
 SkColor GetAuraColor(NativeTheme::ColorId color_id,
                      const NativeTheme* base_theme) {
   // Second wave of MD colors (colors that only appear in secondary UI).
   if (ui::MaterialDesignController::IsSecondaryUiMaterial()) {
     static const SkColor kPrimaryTextColor = SkColorSetRGB(0x33, 0x33, 0x33);
 
     switch (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:
         return SkColorSetA(SK_ColorBLACK, 0x24);
 
       // Textfields
       case NativeTheme::kColorId_TextfieldDefaultColor:
         return kPrimaryTextColor;
       case NativeTheme::kColorId_TextfieldDefaultBackground:
         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;
     }
   }
 
   // MD colors.
   if (ui::MaterialDesignController::IsModeMaterial()) {
     // Dialogs:
     static const SkColor kDialogBackgroundColorMd = SK_ColorWHITE;
@@ skipping 417 matching lines @@
   }
   if (menu_item.corner_radius > 0) {
     const SkScalar radius = SkIntToScalar(menu_item.corner_radius);
     canvas->drawRoundRect(gfx::RectToSkRect(rect), radius, radius, paint);
     return;
   }
   canvas->drawRect(gfx::RectToSkRect(rect), paint);
 }
 
 }  // namespace ui