Add support for all compressed formats in KTX file format

R=robertphillips@google.com

Author: krajcevski@google.com

Review URL: https://codereview.chromium.org/440783004
diff --git a/src/utils/SkTextureCompressor.h b/src/utils/SkTextureCompressor.h
index 4254ae7..e44e7b3 100644
--- a/src/utils/SkTextureCompressor.h
+++ b/src/utils/SkTextureCompressor.h
@@ -9,9 +9,9 @@
 #define SkTextureCompressor_DEFINED
 
 #include "SkImageInfo.h"
-#include "SkBlitter.h"
 
 class SkBitmap;
+class SkBlitter;
 class SkData;
 
 namespace SkTextureCompressor {