Initial KTX file decoder

src/images/SkStreamHelpers.h

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkStreamHelpers_DEFINED
 #define SkStreamHelpers_DEFINED
 
 class SkAutoMalloc;
 class SkStream;
+class SkData;
 
 /**
  *  Copy the provided stream to memory allocated by storage.
  *  Used by SkImageDecoder_libbmp and SkImageDecoder_libico.
  *  @param storage Allocator to hold the memory. Will be reset to be large
  *      enough to hold the entire stream. Upon successful return,
  *      storage->get() will point to data holding the SkStream's entire
  *      contents.
  *  @param stream SkStream to be copied into storage.
  *  @return size_t Total number of bytes in the SkStream, which is also the
  *      number of bytes pointed to by storage->get(). Returns 0 on failure.
  */
 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