Views: Add new SetFocusBehavior method.

ui/views/widget/native_widget_mac_unittest.mm

 // Copyright 2014 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.
 
 #import "ui/views/widget/native_widget_mac.h"
 
 #import <Cocoa/Cocoa.h>
 
 #import "base/mac/foundation_util.h"
 #import "base/mac/scoped_nsobject.h"
@@ skipping 1333 matching lines @@
   // height).
   gfx::Rect expected_appkit_bounds(25, 55, 10, 15);
   EXPECT_NSEQ(expected_appkit_bounds.ToCGRect(),
               [mock_bridged_view lastDirtyRect]);
   widget->CloseNow();
 }
 
 // Ensure traversing NSView focus correctly updates the views::FocusManager.
 TEST_F(NativeWidgetMacTest, ChangeFocusOnChangeFirstResponder) {
   Widget* widget = CreateTopLevelPlatformWidget();
-  widget->GetRootView()->SetFocusable(true);
+  widget->GetRootView()->SetFocusBehavior(View::FocusBehavior::ALWAYS);
   widget->Show();
 
   base::scoped_nsobject<NSView> child_view([[FocusableTestNSView alloc]
       initWithFrame:[widget->GetNativeView() bounds]]);
   [widget->GetNativeView() addSubview:child_view];
   EXPECT_TRUE([child_view acceptsFirstResponder]);
   EXPECT_TRUE(widget->GetRootView()->IsFocusable());
 
   FocusManager* manager = widget->GetFocusManager();
   manager->SetFocusedView(widget->GetRootView());
@@ skipping 145 matching lines @@
   lastDirtyRect_ = dirtyRect;
 }
 
 @end
 
 @implementation FocusableTestNSView
 - (BOOL)acceptsFirstResponder {
   return YES;
 }
 @end