Create new event_utils.h file for Cocoa-specific event to WindowOpenDispositi...

chrome/common/cocoa_utils.mm

-// Copyright (c) 2009 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 "chrome/common/cocoa_utils.h"
-
-namespace event_utils {
-
-// Translates modifier flags from an NSEvent into a WindowOpenDisposition. For
-// example, holding down Cmd (Apple) will cause pages to be opened in a new
-// foreground tab. Pass this the result of -[NSEvent modifierFlags].
-WindowOpenDisposition DispositionFromEventFlags(NSUInteger modifiers) {
-  if (modifiers & NSCommandKeyMask) {
-    return (modifiers & NSShiftKeyMask) ?
-        NEW_BACKGROUND_TAB : NEW_FOREGROUND_TAB;
-  }
-
-  if (modifiers & NSShiftKeyMask)
-    return NEW_WINDOW;
-  // TODO: Browser::OpenURLAtIndex does not support SAVE_TO_DISK, so we can't
-  // offer to download the page. See DCHECK() and TODOs there.
-  return (false /* modifiers & NSAlternateKeyMask */) ?
-      SAVE_TO_DISK : CURRENT_TAB;
-}
-
-}  // namespace event_utils