Refactor texture compressors into separate files

src/utils/SkTextureCompressor_LATC.h

Index: src/utils/SkTextureCompressor_LATC.h
diff --git a/src/utils/SkTextureCompressor_LATC.h b/src/utils/SkTextureCompressor_LATC.h
new file mode 100644
index 0000000000000000000000000000000000000000..e3446b546dca3cb40d06619c5d6639f443cf5621
--- /dev/null
+++ b/src/utils/SkTextureCompressor_LATC.h
@@ -0,0 +1,21 @@
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkTextureCompressor_LATC_DEFINED
+#define SkTextureCompressor_LATC_DEFINED
+
+#include "SkBlitter.h"
+
+namespace SkTextureCompressor {
+
+    bool CompressA8ToLATC(uint8_t* dst, const uint8_t* src,
+                          int width, int height, int rowBytes);
+
+    SkBlitter* CreateLATCBlitter(int width, int height, void* outputBuffer);
+}
+
+#endif  // SkTextureCompressor_LATC_DEFINED