(re-land) Move ui/gfx/codec/ into its own component.

ui/gfx/codec/skia_image_encoder_adapter.h

 // Copyright (c) 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_GFX_CODEC_SKIA_IMAGE_ENCODER_ADAPTER_H
 #define UI_GFX_CODEC_SKIA_IMAGE_ENCODER_ADAPTER_H
 
 #include "third_party/skia/include/core/SkEncodedImageFormat.h"
-#include "ui/gfx/gfx_export.h"
+#include "ui/gfx/codec/codec_export.h"
 
 class SkWStream;
 class SkPixmap;
 
 namespace gfx {
 
 // Matches signature of Skia's SkEncodeImage, but makes use of Chromium's
 // encoders.
-GFX_EXPORT bool EncodeSkiaImage(SkWStream* dst,
-                                const SkPixmap& pixmap,
-                                SkEncodedImageFormat format,
-                                int quality);
+CODEC_EXPORT bool EncodeSkiaImage(SkWStream* dst,
+                                  const SkPixmap& pixmap,
+                                  SkEncodedImageFormat format,
+                                  int quality);
 
 }  // namespace gfx
 
 #endif  // UI_GFX_CODEC_SKIA_IMAGE_ENCODER_ADAPTER_H