Rotate emoji with FreeType.

src/ports/SkFontHost_FreeType_common.h

 /*
  * Copyright 2006-2012 The Android Open Source Project
  * Copyright 2012 Mozilla Foundation
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SKFONTHOST_FREETYPE_COMMON_H_
 #define SKFONTHOST_FREETYPE_COMMON_H_
@@ skipping 13 matching lines @@
 protected:
     // See http://freetype.sourceforge.net/freetype2/docs/reference/ft2-bitmap_handling.html#FT_Bitmap_Embolden
     // This value was chosen by eyeballing the result in Firefox and trying to match it.
     static const FT_Pos kBitmapEmboldenStrength = 1 << 6;
 
     SkScalerContext_FreeType_Base(SkTypeface* typeface, const SkScalerContextEffects& effects,
                                   const SkDescriptor *desc)
         : INHERITED(typeface, effects, desc)
     {}
 
-    void generateGlyphImage(FT_Face face, const SkGlyph& glyph);
+    void generateGlyphImage(FT_Face face, const SkGlyph& glyph, const SkMatrix& bitmapTransform);
     void generateGlyphPath(FT_Face face, SkPath* path);
-
 private:
     typedef SkScalerContext INHERITED;
 };
 
 class SkTypeface_FreeType : public SkTypeface {
 public:
     /** For SkFontMgrs to make use of our ability to extract
      *  name and style from a stream, using FreeType's API.
      */
     class Scanner : ::SkNoncopyable {
@@ skipping 44 matching lines @@
 
     int onGetTableTags(SkFontTableTag tags[]) const override;
     virtual size_t onGetTableData(SkFontTableTag, size_t offset,
                                   size_t length, void* data) const override;
 
 private:
     typedef SkTypeface INHERITED;
 };
 
 #endif // SKFONTHOST_FREETYPE_COMMON_H_