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

ui/native_theme/fallback_theme.cc

Index: ui/native_theme/fallback_theme.cc
diff --git a/ui/native_theme/fallback_theme.cc b/ui/native_theme/fallback_theme.cc
index d995d71c69af5a1946c54ff702bb6b946ed595da..c59ef7de213dd2e672951eb02162d10eb9629b79 100644
--- a/ui/native_theme/fallback_theme.cc
+++ b/ui/native_theme/fallback_theme.cc
@@ -38,6 +38,10 @@ SkColor FallbackTheme::GetSystemColor(ColorId color_id) const {
   static const SkColor kButtonHoverColor = kButtonEnabledColor;
   static const SkColor kButtonHoverBackgroundColor =
       SkColorSetRGB(0xEA, 0xEA, 0xEA);
+  static const SkColor kCallToActionButtonEnabledColor = SK_ColorWHITE;

[msw, 2014/06/02 21:06:20]

nit: one const or inlined values would suffice for now.

[Evan Stade, 2014/06/02 22:18:14]

this follows the precedent set by the rest of this function

+  static const SkColor kCallToActionButtonDisabledColor = SK_ColorWHITE;
+  static const SkColor kCallToActionButtonHighlightColor = SK_ColorWHITE;
+  static const SkColor kCallToActionButtonHoverColor = SK_ColorWHITE;
   // MenuItem:
   static const SkColor kEnabledMenuItemForegroundColor = kButtonEnabledColor;
   static const SkColor kDisabledMenuItemForegroundColor = kButtonDisabledColor;
@@ -142,6 +146,14 @@ SkColor FallbackTheme::GetSystemColor(ColorId color_id) const {
       return kButtonHoverColor;
     case kColorId_ButtonHoverBackgroundColor:
       return kButtonHoverBackgroundColor;
+    case kColorId_CallToActionButtonEnabledColor:
+      return kCallToActionButtonEnabledColor;
+    case kColorId_CallToActionButtonDisabledColor:
+      return kCallToActionButtonDisabledColor;
+    case kColorId_CallToActionButtonHighlightColor:
+      return kCallToActionButtonHighlightColor;
+    case kColorId_CallToActionButtonHoverColor:
+      return kCallToActionButtonHoverColor;
 
     // MenuItem
     case kColorId_EnabledMenuItemForegroundColor: