SkPDF: SkPDFFont organization changes.

src/pdf/SkPDFConvertType1FontStream.h

+/*
+ * Copyright 2016 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkPDFConvertType1FontStream_DEFINED
+#define SkPDFConvertType1FontStream_DEFINED
+
+#include "SkData.h"
+#include "SkStream.h"
+
+/*
+  "A standard Type 1 font program, as described in the Adobe Type 1
+  Font Format specification, consists of three parts: a clear-text
+  portion (written using PostScript syntax), an encrypted portion, and
+  a fixed-content portion.  The fixed-content portion contains 512
+  ASCII zeros followed by a cleartomark operator, and perhaps followed
+  by additional data. Although the encrypted portion of a standard
+  Type 1 font may be in binary or ASCII hexadecimal format, PDF
+  supports only the binary format."
+*/
+sk_sp<SkData> SkPDFConvertType1FontStream(
+        std::unique_ptr<SkStreamAsset> srcStream, size_t* headerLen,
+        size_t* dataLen, size_t* trailerLen);
+
+#endif  // SkPDFConvertType1FontStream_DEFINED