Fix color emoji.

src/gpu/GrFontScaler.cpp

Index: src/gpu/GrFontScaler.cpp
diff --git a/src/gpu/GrFontScaler.cpp b/src/gpu/GrFontScaler.cpp
index 164768f3b08bbfe29f67f226486bca99e1173e8e..b16b498ac1d31bce909c2d218c2d7f91141913c5 100644
--- a/src/gpu/GrFontScaler.cpp
+++ b/src/gpu/GrFontScaler.cpp
@@ -59,7 +59,7 @@ GrFontScaler::~GrFontScaler() {
     SkSafeUnref(fKey);
 }
 
-GrMaskFormat GrFontScaler::getMaskFormat() {
+GrMaskFormat GrFontScaler::getMaskFormat() const {
     SkMask::Format format = fStrike->getMaskFormat();
     switch (format) {
         case SkMask::kBW_Format:
@@ -85,6 +85,28 @@ const GrFontDescKey* GrFontScaler::getKey() {
     return fKey;
 }
 
+GrMaskFormat GrFontScaler::getPackedGlyphMaskFormat(GrGlyph::PackedID packed) const {
+    const SkGlyph& glyph = fStrike->getGlyphIDMetrics(GrGlyph::UnpackID(packed),
+                                                      GrGlyph::UnpackFixedX(packed),
+                                                      GrGlyph::UnpackFixedY(packed));
+    SkMask::Format format = static_cast<SkMask::Format>(glyph.fMaskFormat);
+    switch (format) {
+        case SkMask::kBW_Format:
+            // fall through to kA8 -- we store BW glyphs in our 8-bit cache
+        case SkMask::kA8_Format:
+            return kA8_GrMaskFormat;
+        case SkMask::kLCD16_Format:
+            return kA565_GrMaskFormat;
+        case SkMask::kLCD32_Format:
+            return kA888_GrMaskFormat;
+        case SkMask::kARGB32_Format:
+            return kARGB_GrMaskFormat;
+        default:
+            SkDEBUGFAIL("unsupported SkMask::Format");
+            return kA8_GrMaskFormat;
+    }
+}
+
 bool GrFontScaler::getPackedGlyphBounds(GrGlyph::PackedID packed, SkIRect* bounds) {
     const SkGlyph& glyph = fStrike->getGlyphIDMetrics(GrGlyph::UnpackID(packed),
                                                       GrGlyph::UnpackFixedX(packed),