Made result_filefaceid output optional in FontConfigIPC::Match. There are cases when we are only in…

skia/ext/SkFontHost_fontconfig_impl.h

 /* libs/graphics/ports/SkFontHost_fontconfig_impl.h
 **
 ** Copyright 2009, Google Inc.
 **
 ** Licensed under the Apache License, Version 2.0 (the "License");
 ** you may not use this file except in compliance with the License.
 ** You may obtain a copy of the License at
 **
 **     http://www.apache.org/licenses/LICENSE-2.0
 **
@@ skipping 14 matching lines @@
 #define FontConfigInterface_DEFINED
 
 #include <string>
 
 class FontConfigInterface {
   public:
     virtual ~FontConfigInterface() { }
 
     /** Performs config match
      *
-     *  @param result_family (output) on success, the resulting family name.
-     *  @param result_filefaceid (output) on success, the resulting fileface id.
+     *  @param result_family (optional, set to NULL to ignore, output)
+     *      on success, set to the resulting family name.
+     *  @param result_filefaceid (optional, set to NULL to ignore, output)
+     *      on success, set to the resulting fileface id.
      *  @param filefaceid_valid if true, then |filefaceid| is valid
      *  @param filefaceid the filefaceid (as returned by this function)
      *         which we are trying to match.
      *  @param family (optional) the family of the font that we are trying to
      *    match. If the length of the |family| is greater then
      *    kMaxFontFamilyLength, this function should immediately return false.
      *  @param characters (optional) UTF-16 characters the font must cover.
      *  @param characters_bytes (optional) number of bytes in |characters|
      *  @param is_bold (optional, set to NULL to ignore, in/out)
      *  @param is_italic (optional, set to NULL to ignore, in/out)
@@ skipping 15 matching lines @@
           bool* is_italic) = 0;
 
     /** Open a font file given the filefaceid as returned by Match.
      */
     virtual int Open(unsigned filefaceid) = 0;
 
     static const unsigned kMaxFontFamilyLength = 2048;
 };
 
 #endif  // FontConfigInterface_DEFINED