Have DM manually encode its .png outputs.

gyp/libpng.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.
 
 {
   'variables': {
     'skia_warnings_as_errors': 0,
   },
   'targets': [
     {
       'target_name': 'libpng',
       'type': 'none',
       'conditions': [
-        [ 'skia_os == "android"',
-          {
-            'dependencies': [
-              'android_deps.gyp:png',
-            ],
-            'export_dependent_settings': [
-              'android_deps.gyp:png',
-            ],
-          }, {  # skia_os != "android"
-            'dependencies': [
-              'libpng.gyp:libpng_static',
-            ],
-            'export_dependent_settings': [
-              'libpng.gyp:libpng_static',
-            ],
-          }
-        ]
+        [ 'skia_os == "android"', {
+            'dependencies':              [ 'android_deps.gyp:png' ],
+            'export_dependent_settings': [ 'android_deps.gyp:png' ],
+        },{
+            'dependencies':              [ 'libpng.gyp:libpng_static' ],
+            'export_dependent_settings': [ 'libpng.gyp:libpng_static' ],
+        }]
       ]
     },
     {
+      'target_name': 'libpng_static_when_possible',
+      'type': 'none',
+      'conditions': [
+        [ 'skia_android_framework', {
+            'dependencies':              [ 'android_deps.gyp:png' ],
+            'export_dependent_settings': [ 'android_deps.gyp:png' ],
+        },{
+            'dependencies':              [ 'libpng.gyp:libpng_static' ],
+            'export_dependent_settings': [ 'libpng.gyp:libpng_static' ],
+        }]
+      ]
+    },
+    {
       'target_name': 'libpng_static',
       'type': 'static_library',
       'standalone_static_library': 1,
       'include_dirs': [
         # Needed for generated pnglibconf.h and pngprefix.h
         '../third_party/libpng',
         '../third_party/externals/libpng',
       ],
       'dependencies': [
         'zlib.gyp:zlib',
@@ skipping 31 matching lines @@
         '../third_party/externals/libpng/pngwrite.c',
         '../third_party/externals/libpng/pngwtran.c',
         '../third_party/externals/libpng/pngwutil.c',
       ],
       'conditions': [
         [ 'skia_os == "ios"', {
           # explicitly disable looking for NEON on iOS builds
           'defines': [
             'PNG_ARM_NEON_OPT=0',
           ],
-        }, { # skia_os != "ios" 
+        }, { # skia_os != "ios"
           'dependencies': [
             'libpng.gyp:libpng_static_neon',
           ],
         }],
       ],
     },
     {
       'target_name': 'libpng_static_neon',
       'type': 'static_library',
       'include_dirs': [
@@ skipping 12 matching lines @@
       'conditions': [
         ['arm_neon_optional', {
           'cflags': [
             '-mfpu=neon',
           ],
         }],
       ],
     }
   ]
 }