Add freetype to skia_base_libs when building for NaCl

trunk/gyp/skia_base_libs.gyp

 # The minimal set of static libraries for basic Skia functionality.
 {
   'variables': {
     'component_libs': [
       'core.gyp:core',
       'opts.gyp:opts',
       'ports.gyp:ports',
       'utils.gyp:utils',
     ],
     'conditions': [
       [ 'skia_arch_type == "x86" and skia_os != "android"', {
         'component_libs': [
           'opts.gyp:opts_ssse3',
         ],
       }],
       [ 'arm_neon == 1', {
         'component_libs': [
           'opts.gyp:opts_neon',
         ],
       }],
       [ 'skia_gpu', {
         'component_libs': [
           'gpu.gyp:gr',
           'gpu.gyp:skgr',
         ],
       }],
+      [ 'skia_os == "nacl"', {
+        'component_libs': [
+          'freetype.gyp:freetype',
+        ],
+      }],
     ],
   },
   'targets': [
     {
       'target_name': 'skia_base_libs',
       'type': 'none',
       'dependencies': [
         '<@(component_libs)',
       ],
       'export_dependent_settings': [
         '<@(component_libs)',
       ],
     },
   ],
 }
 
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