Use sRGB pixel config for ARGB masks (color emoji)

src/gpu/text/GrBatchFontCache.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrBatchFontCache.h"
 #include "GrContext.h"
 #include "GrGpu.h"
 #include "GrRectanizer.h"
 #include "GrResourceProvider.h"
 #include "GrSurfacePriv.h"
 #include "SkString.h"
 
 #include "SkDistanceFieldGen.h"
 
 bool GrBatchFontCache::initAtlas(GrMaskFormat format) {
     int index = MaskFormatToAtlasIndex(format);
     if (!fAtlases[index]) {
-        GrPixelConfig config = MaskFormatToPixelConfig(format);
+        GrPixelConfig config = MaskFormatToPixelConfig(format, *fContext->caps());
         int width = fAtlasConfigs[index].fWidth;
         int height = fAtlasConfigs[index].fHeight;
         int numPlotsX = fAtlasConfigs[index].numPlotsX();
         int numPlotsY = fAtlasConfigs[index].numPlotsY();
 
         fAtlases[index] =
                 fContext->resourceProvider()->createAtlas(config, width, height,
                                                           numPlotsX, numPlotsY,
                                                           &GrBatchFontCache::HandleEviction,
                                                           (void*)this);
@@ skipping 349 matching lines @@
 
     bool success = fBatchFontCache->addToAtlas(this, &glyph->fID, target, expectedMaskFormat,
                                                glyph->width(), glyph->height(),
                                                storage.get(), &glyph->fAtlasLocation);
     if (success) {
         SkASSERT(GrBatchAtlas::kInvalidAtlasID != glyph->fID);
         fAtlasedGlyphs++;
     }
     return success;
 }