fix typo in android_framework_lib.gyp

BUG=skia:

Review URL: https://codereview.chromium.org/1293183002 .
diff --git a/gyp/android_framework_lib.gyp b/gyp/android_framework_lib.gyp
index a4fc169..7bdc8b1 100644
--- a/gyp/android_framework_lib.gyp
+++ b/gyp/android_framework_lib.gyp
@@ -11,7 +11,7 @@
         'codec.gyp:codec',
         'core.gyp:core',
         'effects.gyp:effects',
-        'gpu.gyp:skgpu'
+        'gpu.gyp:skgpu',
         'images.gyp:images',
         'opts.gyp:opts',
         'pdf.gyp:pdf',