miniz support in SkFlate / PDF

gyp/zlib.gyp

 # Copyright 2014 Google Inc.
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'targets': [{
     'target_name': 'zlib',
     'type': 'none',
     'direct_dependent_settings': {
       'conditions': [
         [ 'skia_android_framework', { 'include_dirs': [ 'external/zlib' ] }],
         [ 'skia_os == "mac" or skia_os == "ios"', {
             # XCode needs and explicit file path, not a logical name like -lz.
             'link_settings': { 'libraries': [ '$(SDKROOT)/usr/lib/libz.dylib' ] },
         },{
             'link_settings': { 'libraries': [ '-lz' ] },
         }]
       ],
     },
+  },{
+    'target_name': 'miniz',
+    'type': 'none',
+    'direct_dependent_settings': {
+      'include_dirs': [ '../third_party/miniz' ],
+      'defines': [ 'ZLIB_INCLUDE="miniz.c"' ],
+    },
   }],
 }