unified PNG encoding between SkDrawCommand and skiaserve

gyp/gmslides.gypi

 # Copyright 2015 Google Inc.
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 # include this gypi to include all the golden master slides.
 {
   'include_dirs': [
     '../gm',
     # include dirs needed by particular GMs
     '../include/client/android',
@@ skipping 14 matching lines @@
         '../src/gpu/batches/GrTestBatch.h',
         '../tools/debugger/SkDrawCommand.h',
         '../tools/debugger/SkDrawCommand.cpp',
         '../tools/debugger/SkDebugCanvas.h',
         '../tools/debugger/SkDebugCanvas.cpp',
         '../tools/debugger/SkObjectParser.h',
         '../tools/debugger/SkObjectParser.cpp',
         '../tools/debugger/SkOverdrawMode.h',
         '../tools/debugger/SkOverdrawMode.cpp',
       ],
+      'dependencies': [
+        'libpng.gyp:libpng',
+      ]
     }],
   ],
 }