libgif codec for Skia

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 MPL-1.1 / GPL-2.0 / LGPL-2.1
 ============================

 SkGifImageReader.cpp and SkGifImageReader.h:

     ***** BEGIN LICENSE BLOCK *****
     Version: MPL 1.1/GPL 2.0/LGPL 2.1

     The contents of this file are subject to the Mozilla Public License Version
     1.1 (the "License"); you may not use this file except in compliance with
     the License. You may obtain a copy of the License at
     http://www.mozilla.org/MPL/

     Software distributed under the License is distributed on an "AS IS" basis,
     WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
     for the specific language governing rights and limitations under the
     License.

     The Original Code is mozilla.org code.

     The Initial Developer of the Original Code is
     Netscape Communications Corporation.
     Portions created by the Initial Developer are Copyright (C) 1998
     the Initial Developer. All Rights Reserved.

     Contributor(s):
       Chris Saari <saari@netscape.com>
       Apple Computer

     Alternatively, the contents of this file may be used under the terms of
     either the GNU General Public License Version 2 or later (the "GPL"), or
     the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
     in which case the provisions of the GPL or the LGPL are applicable instead
     of those above. If you wish to allow use of your version of this file only
     under the terms of either the GPL or the LGPL, and not to allow others to
     use your version of this file under the terms of the MPL, indicate your
     decision by deleting the provisions above and replace them with the notice
     and other provisions required by the GPL or the LGPL. If you do not delete
     the provisions above, a recipient may use your version of this file under
     the terms of any one of the MPL, the GPL or the LGPL.

     ***** END LICENSE BLOCK ***** * /


 BSD-3-Clause
 ============

 libgifcodec.gni, SkGifCodec.h, SkLibGifCodec.cpp, SkLibGifCodec.h:

     Copyright 2019 Google LLC. All rights reserved.

     Redistribution and use in source and binary forms, with or without
     modification, are permitted provided that the following conditions are
     met:

       * Redistributions of source code must retain the above copyright
         notice, this list of conditions and the following disclaimer.

       * Redistributions in binary form must reproduce the above
         copyright notice, this list of conditions and the following
         disclaimer in the documentation and/or other materials provided
         with the distribution.

       * Neither the name of the copyright holder nor the names of its
         contributors may be used to endorse or promote products derived
         from this software without specific prior written permission.

     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.


 BSD-2-Clause
 ============

 SkLibGifCodec.cpp:

     Copyright (C) 2006 Apple Computer, Inc.  All rights reserved.

     Redistribution and use in source and binary forms, with or without
     modification, are permitted provided that the following conditions
     are met:

     1. Redistributions of source code must retain the above copyright
        notice, this list of conditions and the following disclaimer.

     2. Redistributions in binary form must reproduce the above copyright
        notice, this list of conditions and the following disclaimer in the
        documentation and/or other materials provided with the distribution.

     THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
     EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
     CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.