Replace SkPicture(SkStream) constructors with a factory.

gyp/effects.gyp

+# Gyp file for effects
 {
   'targets': [
     {
       'target_name': 'effects',
       'product_name': 'skia_effects',
       'type': 'static_library',
       'standalone_static_library': 1,
       'includes': [
         'effects.gypi',
       ],
       'include_dirs': [
         '../include/config',
         '../include/core',
         '../include/effects',
+        '../include/lazy',
         '../include/utils',
         '../src/core',
       ],
       'direct_dependent_settings': {
         'include_dirs': [
           '../include/effects',
         ],
       },
       'sources': [
         'effects.gypi', # Makes the gypi appear in IDEs (but does not modify the build).
       ],
       'conditions': [
         ['skia_gpu == 1', {
           'include_dirs': [
             '../include/gpu',
             '../src/gpu',
           ],
         }],
       ],
     },
   ],
 }
 
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