MacViews: Implement Full Keyboard Access.

ui/views/controls/button/md_text_button.cc

 // 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.
 
 #include "ui/views/controls/button/md_text_button.h"
 
 #include "base/i18n/case_conversion.h"
 #include "ui/gfx/render_text.h"
 #include "ui/native_theme/native_theme.h"
 
@@ skipping 16 matching lines @@
 
 }  // namespace
 
 MdTextButton::MdTextButton(ButtonListener* listener, const base::string16& text)
     : CustomButton(listener),
       render_text_(gfx::RenderText::CreateInstance()) {
   render_text_->SetFontList(GetFontList());
   render_text_->SetCursorEnabled(false);
   render_text_->SetText(base::i18n::ToUpper(text));
 
+#if !defined(OS_MACOSX)
   SetFocusable(true);
+#else
+  SetFocusable(false);
+  SetAccessibilityFocusable(true);
+#endif
 }
 
 MdTextButton::~MdTextButton() {}
 
 void MdTextButton::OnPaint(gfx::Canvas* canvas) {
   UpdateColor();
   gfx::Rect rect = GetLocalBounds();
   rect.Inset(kHorizontalPadding, kVerticalPadding);
   render_text_->SetDisplayRect(rect);
   render_text_->Draw(canvas);
 }
 
 gfx::Size MdTextButton::GetPreferredSize() const {
   gfx::Size size = render_text_->GetStringSize();
   size.SetToMax(gfx::Size(kMinWidth, 0));
   size.Enlarge(kHorizontalPadding * 2, kVerticalPadding * 2);
   return size;
 }
 
 void MdTextButton::UpdateColor() {
   // TODO(estade): handle call to action theming and other things that can
   // affect the text color.
   render_text_->SetColor(GetNativeTheme()->GetSystemColor(
       enabled() ? ui::NativeTheme::kColorId_MdTextButtonEnabledColor
                 : ui::NativeTheme::kColorId_MdTextButtonDisabledColor));
 }
 
 }  // namespace views