a11y: Exclude children of nested keyboard accessible controls from a11y tree.

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_nsautorelease_pool.h"
@@ skipping 634 matching lines @@
 // Tests that an accessibility request from the system makes its way through to
 // a views::Label filling the window.
 TEST_F(NativeWidgetMacTest, AccessibilityIntegration) {
   Widget* widget = CreateTopLevelPlatformWidget();
   gfx::Rect screen_rect(50, 50, 100, 100);
   widget->SetBounds(screen_rect);
 
   const base::string16 test_string = base::ASCIIToUTF16("Green");
   views::Label* label = new views::Label(test_string);
   label->SetBounds(0, 0, 100, 100);
+  label->SetFocusBehavior(ClientView::FocusBehavior::ACCESSIBLE_ONLY);
   widget->GetContentsView()->AddChildView(label);
   widget->Show();
 
   // Accessibility hit tests come in Cocoa screen coordinates.
   NSRect nsrect = gfx::ScreenRectToNSRect(screen_rect);
   NSPoint midpoint = NSMakePoint(NSMidX(nsrect), NSMidY(nsrect));
 
   id hit = [widget->GetNativeWindow() accessibilityHitTest:midpoint];
   id title = [hit accessibilityAttributeValue:NSAccessibilityTitleAttribute];
-  EXPECT_NSEQ(title, @"Green");
+  EXPECT_NSEQ(@"Green", title);
 
   widget->CloseNow();
 }
 
 // Tests creating a views::Widget parented off a native NSWindow.
 TEST_F(NativeWidgetMacTest, NonWidgetParent) {
   NSWindow* native_parent = MakeNativeParent();
 
   base::scoped_nsobject<NSView> anchor_view(
       [[NSView alloc] initWithFrame:[[native_parent contentView] bounds]]);
@@ skipping 1118 matching lines @@
 
 - (void)dealloc {
   if (deallocFlag_) {
     DCHECK(!*deallocFlag_);
     *deallocFlag_ = true;
   }
   [super dealloc];
 }
 
 @end