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

ui/views/controls/button/label_button_label.h

Index: ui/views/controls/button/label_button_label.h
diff --git a/ui/views/controls/button/label_button_label.h b/ui/views/controls/button/label_button_label.h
new file mode 100644
index 0000000000000000000000000000000000000000..b8bee83847b7ac576159206a3d5530c3ac971b52
--- /dev/null
+++ b/ui/views/controls/button/label_button_label.h
@@ -0,0 +1,42 @@
+// 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.
+
+#ifndef UI_VIEWS_CONTROLS_BUTTON_LABEL_BUTTON_LABEL_H_
+#define UI_VIEWS_CONTROLS_BUTTON_LABEL_BUTTON_LABEL_H_
+
+#include "base/macros.h"
+#include "base/strings/string16.h"
+#include "third_party/skia/include/core/SkColor.h"
+#include "ui/views/controls/label.h"
+
+namespace views {
+
+// A Label subclass that can be disabled, for use in a LabelButton.
+class LabelButtonLabel : public Label {

[sky, 2017/06/06 17:12:24]

Please document this is an implementation detail, and not public. Also, can you
move the header into a section in the BUILD.gn so that only views code can use
it?

[tapted, 2017/06/08 04:11:31]

Done. Although the second bit was tricky - see later comments and comments in
views/BUILD.gn

+ public:
+  LabelButtonLabel(const base::string16& text, int text_context);
+  ~LabelButtonLabel() override;
+
+  void SetDisabledColor(SkColor color);
+
+ protected:
+  // Label:
+  void OnEnabledChanged() override;
+  void OnNativeThemeChanged(const ui::NativeTheme* theme) override;
+  SkColor GetForegroundColor() const override;
+  void OnBackgroundColorChanged() override;
+
+ private:
+  void SetDisabledColorInternal(SkColor color, bool from_theme);
+
+  SkColor requested_disabled_color_ = SK_ColorRED;
+  SkColor actual_disabled_color_ = SK_ColorRED;
+  bool disabled_color_set_ = false;
+
+  DISALLOW_COPY_AND_ASSIGN(LabelButtonLabel);
+};
+
+}  // namespace views
+
+#endif  // UI_VIEWS_CONTROLS_BUTTON_LABEL_BUTTON_LABEL_H_