MacViews: Implement Full Keyboard Access.

ui/views/cocoa/views_nswindow_delegate.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/cocoa/views_nswindow_delegate.h"
 
 #include "base/logging.h"
 #import "ui/views/cocoa/bridged_content_view.h"
 #import "ui/views/cocoa/bridged_native_widget.h"
 #include "ui/views/widget/native_widget_mac.h"
@@ skipping 25 matching lines @@
 }
 
 - (void)onWindowOrderWillChange:(NSWindowOrderingMode)orderingMode {
   parent_->OnVisibilityChangedTo(orderingMode != NSWindowOut);
 }
 
 - (void)onWindowOrderChanged:(NSNotification*)notification {
   parent_->OnVisibilityChanged();
 }
 
+- (void)onFullKeyboardAccessModeChanged:(NSNotification*)notification {
+  parent_->native_widget_mac()

[tapted, 2016/02/23 03:01:19]

I think nicer would be a new method on BridgedContentView, perhaps
`UpdateFullKeyboardAccess()` (i.e. rather than On...Changed, since we want to
call it when we don't know if it's changing).

Then collapse all the places you have a `[NSApp isFullKeyboardAccessEnabled]`
into that single function.

[karandeepb, 2016/03/15 02:19:50]

Done.

+      ->GetWidget()
+      ->GetFocusManager()
+      ->SetKeyboardAccessibility([NSApp isFullKeyboardAccessEnabled]);
+}
+
 - (void)onWindowWillDisplay {
   parent_->OnVisibilityChangedTo(true);
 }
 
 - (void)sheetDidEnd:(NSWindow*)sheet
          returnCode:(NSInteger)returnCode
         contextInfo:(void*)contextInfo {
   [sheet orderOut:nil];
   parent_->OnWindowWillClose();
 }
@@ skipping 80 matching lines @@
             usingRect:(NSRect)defaultSheetLocation {
   // As per NSWindowDelegate documentation, the origin indicates the top left
   // point of the host frame in window coordinates. The width changes the
   // animation from vertical to trapezoid if it is smaller than the width of the
   // dialog. The height is ignored but should be set to zero.
   return NSMakeRect(0, [self nativeWidgetMac]->SheetPositionY(),
                     NSWidth(defaultSheetLocation), 0);
 }
 
 @end