Use SkPngEncoder in gfx jpeg_codec

ui/gfx/codec/vector_wstream.h

Index: ui/gfx/codec/vector_wstream.h
diff --git a/ui/gfx/codec/vector_wstream.h b/ui/gfx/codec/vector_wstream.h
new file mode 100644
index 0000000000000000000000000000000000000000..5a20c470e1ac3ad5e1f64169a60c2cf0fcc86732
--- /dev/null
+++ b/ui/gfx/codec/vector_wstream.h
@@ -0,0 +1,36 @@
+// Copyright (c) 2017 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_VECTOR_WSTREAM_CODEC_H_
+#define UI_GFX_VECTOR_WSTREAM_CODEC_H_
+
+#include <stddef.h>
+
+#include <vector>
+
+#include "base/logging.h"
+#include "third_party/skia/include/core/SkStream.h"
+
+namespace gfx {
+
+class VectorWStream : public SkWStream {
+ public:
+  // We do not take ownership of dst
+  VectorWStream(std::vector<unsigned char>* dst) : dst_(dst) {
+    DCHECK(dst_);
+    DCHECK_EQ(0UL, dst_->size());
+  }
+
+  bool write(const void* buffer, size_t size) override;
+
+  size_t bytesWritten() const override;
+
+ private:
+  // Does not have ownership.
+  std::vector<unsigned char>* dst_;
+};
+
+}  // namespace gfx
+
+#endif  // UI_GFX_VECTOR_WSTREAM_H_