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

ui/views/controls/button/label_button.cc

Index: ui/views/controls/button/label_button.cc
diff --git a/ui/views/controls/button/label_button.cc b/ui/views/controls/button/label_button.cc
index fd9d5641d5e38fca453140e5d9bbd386092723fb..55b39ebf0441347c10ffc38f62884e25698760f9 100644
--- a/ui/views/controls/button/label_button.cc
+++ b/ui/views/controls/button/label_button.cc
@@ -365,7 +365,12 @@ void LabelButton::UpdateThemedBorder() {
 #if defined(OS_LINUX) && !defined(OS_CHROMEOS)
   views::LinuxUI* linux_ui = views::LinuxUI::instance();
   if (linux_ui) {
+    Border* default_border = label_button_border.get();
     SetBorder(linux_ui->CreateNativeBorder(this, label_button_border.Pass()));
+    label_->SetBackgroundColor(GetNativeTheme()->GetSystemColor(
+        ui::NativeTheme::kColorId_ButtonBackgroundColor));
+    // If we're using a system-themed border, make sure text is legible.
+    label_->SetAutoColorReadabilityEnabled(border() != default_border);

[Elliot Glaysher, 2014/05/23 21:07:01]

Do we want to be executing all this outside of BlueButton?

[Evan Stade, 2014/05/23 23:39:53]

I guess I get why you're asking -- because normal LabelButton doesn't need it.
But any time there's a non-default text color set, it is useful (BlueButton is
only one such instance). I don't think it should hurt to have this even for
normal LabelButtons. If there's a GTK theme where the fg and bg colors aren't
distinguishable from each other, that's broken.

But your question did make me investigate more and I found that hovering a
bluebutton with highcontrastinverse applied would leave the text white on a
white background. That's fixed by changing the background color of the label in
StateChanged().

   } else
 #endif
   {