fix text color of BlueButton on GTK-theme-mode Linux Aura.

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 "grit/ui_resources.h"
 #include "third_party/skia/include/core/SkCanvas.h"
 #include "ui/base/resource/resource_bundle.h"
@@ skipping 16 matching lines @@
 const SkColor kEnabledMenuButtonBorderColor = SkColorSetARGB(36, 0, 0, 0);
 const SkColor kFocusedMenuButtonBorderColor = SkColorSetARGB(72, 0, 0, 0);
 const SkColor kHoverMenuButtonBorderColor = SkColorSetARGB(72, 0, 0, 0);
 const SkColor kMenuSeparatorColor = SkColorSetRGB(0xE9, 0xE9, 0xE9);
 const SkColor kEnabledMenuItemForegroundColor = SK_ColorBLACK;
 const SkColor kDisabledMenuItemForegroundColor = SkColorSetRGB(161, 161, 146);
 const SkColor kHoverMenuItemBackgroundColor =
     SkColorSetARGB(204, 255, 255, 255);
 // Button:
 const SkColor kButtonHoverBackgroundColor = SkColorSetRGB(0xEA, 0xEA, 0xEA);
+const SkColor kBlueButtonEnabledColor = SK_ColorWHITE;
+const SkColor kBlueButtonDisabledColor = SK_ColorWHITE;
+const SkColor kBlueButtonHighlightColor = SK_ColorWHITE;
+const SkColor kBlueButtonHoverColor = SK_ColorWHITE;
 
 }  // namespace
 
 namespace ui {
 
 bool CommonThemeGetSystemColor(NativeTheme::ColorId color_id, SkColor* color) {
   switch (color_id) {
     // MenuItem
     case NativeTheme::kColorId_MenuBorderColor:
       *color = kMenuBorderColor;
@@ skipping 31 matching lines @@
     case NativeTheme::kColorId_SelectedMenuItemForegroundColor:
       *color = SK_ColorWHITE;
       break;
     case NativeTheme::kColorId_ButtonDisabledColor:
       *color = kDisabledMenuItemForegroundColor;
       break;
     // Button
     case NativeTheme::kColorId_ButtonHoverBackgroundColor:
       *color = kButtonHoverBackgroundColor;
       break;
+    case NativeTheme::kColorId_BlueButtonEnabledColor:
+      *color = kBlueButtonEnabledColor;
+      break;
+    case NativeTheme::kColorId_BlueButtonDisabledColor:
+      *color = kBlueButtonDisabledColor;
+      break;
+    case NativeTheme::kColorId_BlueButtonHighlightColor:
+      *color = kBlueButtonHighlightColor;
+      break;
+    case NativeTheme::kColorId_BlueButtonHoverColor:
+      *color = kBlueButtonHoverColor;
+      break;
     default:
       return false;
   }
 
   if (gfx::IsInvertedColorScheme()) {
     switch (color_id) {
       case NativeTheme::kColorId_FocusedMenuItemBackgroundColor:
         *color = kMenuInvertedSchemeHighlightBackgroundColor;
         break;
       default:
@@ skipping 69 matching lines @@
       paint.setColor(color);
       break;
     default:
       NOTREACHED() << "Invalid state " << state;
       break;
   }
   canvas->drawRect(gfx::RectToSkRect(rect), paint);
 }
 
 }  // namespace ui