Make android framework depend on SkCodec.

This results in exporting include/codec so the framework can use it.

Review URL: https://codereview.chromium.org/1020903002
diff --git a/gyp/android_framework_lib.gyp b/gyp/android_framework_lib.gyp
index da68530..9e5bd71 100644
--- a/gyp/android_framework_lib.gyp
+++ b/gyp/android_framework_lib.gyp
@@ -8,6 +8,7 @@
       'target_name': 'libskia',
       'type': 'shared_library',
       'dependencies': [
+        'codec.gyp:codec',
         'core.gyp:core',
         'effects.gyp:effects',
         'images.gyp:images',