Enable unused param checking for public includes.

include/gpu/GrColor.h

Index: include/gpu/GrColor.h
diff --git a/include/gpu/GrColor.h b/include/gpu/GrColor.h
index 3470c88fe6eff8dc91057f54733a4f805dda6d51..22ebc0e6564e087d59673d9e85ec5c0ac0b9b5dd 100644
--- a/include/gpu/GrColor.h
+++ b/include/gpu/GrColor.h
@@ -66,7 +66,7 @@ static inline GrColor GrColorPackRGBA(unsigned r, unsigned g,
 /**
  * Assert in debug builds that a GrColor is premultiplied.
  */
-static inline void GrColorIsPMAssert(GrColor c) {
+static inline void GrColorIsPMAssert(GrColor SK_UNUSED(c)) {

[mtklein, 2014/11/14 16:30:15]

--> SkDEBUGCODE?  Makes it a little clearer when it's used.  I wouldn't be
surprised if it triggered another warning if we use an argument marked unused.

[djsollen, 2014/11/14 18:55:23]

Done.

 #ifdef SK_DEBUG
     unsigned a = GrColorUnpackA(c);
     unsigned r = GrColorUnpackR(c);