Initial KTX file decoder

src/images/SkStreamHelpers.h

Index: src/images/SkStreamHelpers.h
diff --git a/src/images/SkStreamHelpers.h b/src/images/SkStreamHelpers.h
index 7e766b7eccc45e15e89fe830ec6cc71f142a8961..008dd8e17a05f75b60e309a44578c2aa0b5c04d3 100644
--- a/src/images/SkStreamHelpers.h
+++ b/src/images/SkStreamHelpers.h
@@ -10,6 +10,7 @@
 
 class SkAutoMalloc;
 class SkStream;
+class SkData;
 
 /**
  *  Copy the provided stream to memory allocated by storage.
@@ -24,4 +25,12 @@ class SkStream;
  */
 size_t CopyStreamToStorage(SkAutoMalloc* storage, SkStream* stream);
 
+/**
+ *  Copy the provided stream to an SkData variable. Used by SkImageDecoder_libktx.
+ *  @param stream SkStream to be copied into data.
+ *  @return SkData* The resulting SkData after the copy. This data will have a
+ *      ref count of one upon return and belongs to the caller. Returns NULL on failure.
+ */
+SkData *CopyStreamToData(SkStream* stream);
+
 #endif // SkStreamHelpers_DEFINED