prototype for kerning api

BUG=
R=bungeman@google.com

Review URL: https://codereview.chromium.org/29363009

git-svn-id: http://skia.googlecode.com/svn/trunk@12018 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/ports/SkFontHost_FreeType_common.h b/src/ports/SkFontHost_FreeType_common.h
index c0f2dc7..0021dfd 100644
--- a/src/ports/SkFontHost_FreeType_common.h
+++ b/src/ports/SkFontHost_FreeType_common.h
@@ -59,7 +59,8 @@
                                 SkAdvancedTypefaceMetrics::PerGlyphInfo,
                                 const uint32_t*, uint32_t) const SK_OVERRIDE;
     virtual int onGetUPEM() const SK_OVERRIDE;
-
+    virtual bool onGetKerningPairAdjustments(const uint16_t glyphs[], int count,
+                                       int32_t adjustments[]) const SK_OVERRIDE;
     virtual int onCharsToGlyphs(const void* chars, Encoding, uint16_t glyphs[],
                                 int glyphCount) const SK_OVERRIDE;
     virtual int onCountGlyphs() const SK_OVERRIDE;