First stab at MD text buttons

ui/views/controls/button/md_text_button.h

Index: ui/views/controls/button/md_text_button.h
diff --git a/ui/views/controls/button/md_text_button.h b/ui/views/controls/button/md_text_button.h
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+++ b/ui/views/controls/button/md_text_button.h
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+// Copyright 2015 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_MD_TEXT_BUTTON_H_
+#define UI_VIEWS_CONTROLS_BUTTON_MD_TEXT_BUTTON_H_
+
+#include "base/memory/scoped_ptr.h"
+#include "ui/views/controls/button/custom_button.h"
+
+namespace gfx {
+class RenderText;
+}
+
+namespace views {
+
+// A button class that implements the Material Design text button spec.
+class VIEWS_EXPORT MdTextButton : public CustomButton {
+ public:
+  MdTextButton(ButtonListener* listener, const base::string16& text);
+  ~MdTextButton() override;
+
+  // View:
+  void OnPaint(gfx::Canvas* canvas) override;
+  gfx::Size GetPreferredSize() const override;
+
+ private:
+  void UpdateColor();
+
+  scoped_ptr<gfx::RenderText> render_text_;
+
+  DISALLOW_COPY_AND_ASSIGN(MdTextButton);
+};
+
+}  // namespace views
+
+#endif  // UI_VIEWS_CONTROLS_BUTTON_MD_TEXT_BUTTON_H_