Use a wrapper for SkDebugf in SkCodec.

It can be silenced or not with one flag.
Always print when building for the android framework.

Also remove the meaningless define of override to override.

BUG=skia:3257

Review URL: https://codereview.chromium.org/1032093004
diff --git a/gyp/common_conditions.gypi b/gyp/common_conditions.gypi
index a38c92d..7f0b602 100644
--- a/gyp/common_conditions.gypi
+++ b/gyp/common_conditions.gypi
@@ -419,7 +419,7 @@
         # We can't use the skia_shared_library gyp setting because we need expose
         # this define globally and the the implemention define as a cflag.
         'SKIA_DLL',
-        'override override',
+        'SK_PRINT_CODEC_MESSAGES',
         # Defines from skia_for_android_framework_defines.gypi
         '<@(skia_for_android_framework_defines)',
       ],