Move views::Label DisabledColor logic into views::LabelButtonLabel

ui/views/controls/button/label_button_label.cc

Index: ui/views/controls/button/label_button_label.cc
diff --git a/ui/views/controls/button/label_button_label.cc b/ui/views/controls/button/label_button_label.cc
new file mode 100644
index 0000000000000000000000000000000000000000..fb0e182a58fdd5dc64f1ec0e3c67ca47b31b88f5
--- /dev/null
+++ b/ui/views/controls/button/label_button_label.cc
@@ -0,0 +1,59 @@
+// Copyright 2017 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/views/controls/button/label_button_label.h"
+
+namespace views {
+
+LabelButtonLabel::LabelButtonLabel(const base::string16& text, int text_context)
+    : Label(text, text_context, style::STYLE_PRIMARY) {
+  SetDisabledColorInternal(
+      style::GetColor(text_context, style::STYLE_DISABLED, GetNativeTheme()),
+      true);
+}
+
+LabelButtonLabel::~LabelButtonLabel() {}
+
+void LabelButtonLabel::SetDisabledColor(SkColor color) {
+  SetDisabledColorInternal(color, false);
+}
+
+void LabelButtonLabel::OnEnabledChanged() {
+  ApplyTextColors();
+  Label::OnEnabledChanged();
+}
+
+void LabelButtonLabel::OnNativeThemeChanged(const ui::NativeTheme* theme) {
+  SetDisabledColorInternal(
+      style::GetColor(text_context(), style::STYLE_DISABLED, GetNativeTheme()),
+      true);
+  Label::OnNativeThemeChanged(theme);
+}
+
+SkColor LabelButtonLabel::GetForegroundColor() const {
+  return enabled() ? enabled_color() : actual_disabled_color_;
+}
+
+void LabelButtonLabel::OnBackgroundColorChanged() {
+  actual_disabled_color_ = EnsureTextColorReadable(requested_disabled_color_);
+}
+
+void LabelButtonLabel::SetDisabledColorInternal(SkColor color,
+                                                bool from_theme) {
+  if (from_theme && disabled_color_set_)
+    return;
+
+  disabled_color_set_ = !from_theme;
+  if (color == requested_disabled_color_)
+    return;
+
+  requested_disabled_color_ = color;
+  actual_disabled_color_ = EnsureTextColorReadable(requested_disabled_color_);
+  if (!enabled()) {
+    ApplyTextColors();
+    SchedulePaint();
+  }
+}
+
+}  // namespace views