start to plumb ttcIndex into fonthost. For now just add to SkFontStream and its callers.

trunk/src/core/SkFontStream.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 SkFontStream_DEFINED
 #define SkFontStream_DEFINED
 
 class SkStream;
 
 #include "SkTypeface.h"
 
 class SkFontStream {
 public:
     /**
+     *  Return the number of shared 'fonts' inside a TTC sfnt, or return 0
+     *  if the stream is a normal sfnt (not a TTC).
+     *
      *  Note: the stream is rewound initially, but is returned at an arbitrary
      *  read offset.
      */
-    static int GetTableTags(SkStream*, SkFontTableTag tags[]);
+    static int CountTTCEntries(SkStream*);
 
     /**
+     *  @param ttcIndex 0 for normal sfnts, or the index within a TTC sfnt.
+     *
      *  Note: the stream is rewound initially, but is returned at an arbitrary
      *  read offset.
      */
-    static size_t GetTableData(SkStream*, SkFontTableTag tag,
+    static int GetTableTags(SkStream*, int ttcIndex, SkFontTableTag tags[]);
+
+    /**
+     *  @param ttcIndex 0 for normal sfnts, or the index within a TTC sfnt.
+     *
+     *  Note: the stream is rewound initially, but is returned at an arbitrary
+     *  read offset.
+     */
+    static size_t GetTableData(SkStream*, int ttcIndex, SkFontTableTag tag,
                                size_t offset, size_t length, void* data);
 };
 
 #endif