MacViews: Implement Full Keyboard Access.

ui/views/view.cc

Index: ui/views/view.cc
diff --git a/ui/views/view.cc b/ui/views/view.cc
index 4c62a000f61882cf5115a2f541ba8e7b86fb8af5..05892f1320f571f36c69046786fca7a41bedbe6f 100644
--- a/ui/views/view.cc
+++ b/ui/views/view.cc
@@ -1201,6 +1201,34 @@ void View::SetNextFocusableView(View* view) {
   next_focusable_view_ = view;
 }
 
+void View::SetFocusBehavior(FocusBehavior focus_behavior) {
+  if (focus_behavior == FocusBehavior::CONTROL) {
+#if defined(OS_MACOSX)
+    focus_behavior = FocusBehavior::ACCESSIBLE_ONLY;
+#else
+    focus_behavior = FocusBehavior::ALWAYS;
+#endif
+  }
+
+  switch (focus_behavior) {
+    case FocusBehavior::ALWAYS:
+      SetFocusable(true);
+      SetAccessibilityFocusable(true);
+      break;
+    case FocusBehavior::NEVER:
+      SetFocusable(false);
+      SetAccessibilityFocusable(false);
+      break;
+    case FocusBehavior::ACCESSIBLE_ONLY:
+      SetFocusable(false);
+      SetAccessibilityFocusable(true);
+      break;
+    case FocusBehavior::CONTROL:
+      NOTREACHED();
+      break;
+  }
+}
+
 void View::SetFocusable(bool focusable) {
   if (focusable_ == focusable)
     return;