MacViews: Implement Full Keyboard Access.

ui/views/controls/button/button.cc

Index: ui/views/controls/button/button.cc
diff --git a/ui/views/controls/button/button.cc b/ui/views/controls/button/button.cc
index 92603dd145955a3113d250a27b1e6f66612b83cb..667afbeff394158de137f1ae1d3dec550f7f4b00 100644
--- a/ui/views/controls/button/button.cc
+++ b/ui/views/controls/button/button.cc
@@ -24,6 +24,16 @@ Button::ButtonState Button::GetButtonStateFrom(ui::NativeTheme::State state) {
   return Button::STATE_NORMAL;
 }
 
+// static
+void Button::ConfigureDefaultFocus(Button* button) {
+// On Mac, buttons are focusable only in full keyboard access mode.
+#if defined(OS_MACOSX)
+  button->SetFocusBehavior(FocusBehavior::ACCESSIBLE_ONLY);
+#else
+  button->SetFocusBehavior(FocusBehavior::ALWAYS);
+#endif
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // Button, public:
 
@@ -64,7 +74,7 @@ void Button::GetAccessibleState(ui::AXViewState* state) {
 Button::Button(ButtonListener* listener)
     : listener_(listener),
       tag_(-1) {
-  SetAccessibilityFocusable(true);
+  SetFocusBehavior(views::View::FocusBehavior::ACCESSIBLE_ONLY);
 }
 
 void Button::NotifyClick(const ui::Event& event) {