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diff --git a/base/gfx/png_decoder.h b/base/gfx/png_decoder.h
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+// Copyright 2008, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef BASE_GFX_PNG_DECODER_H__
+#define BASE_GFX_PNG_DECODER_H__
+
+#include <vector>
+
+#include "base/basictypes.h"
+
+class SkBitmap;
+
+// Interface for decoding PNG data. This is a wrapper around libpng,
+// which has an inconvenient interface for callers. This is currently designed
+// for use in tests only (where we control the files), so the handling isn't as
+// robust as would be required for a browser (see Decode() for more).  WebKit
+// has its own more complicated PNG decoder which handles, among other things,
+// partially downloaded data.
+class PNGDecoder {
+ public:
+  enum ColorFormat {
+    // 3 bytes per pixel (packed), in RGB order regardless of endianness.
+    // This is the native JPEG format.
+    FORMAT_RGB,
+
+    // 4 bytes per pixel, in RGBA order in memory regardless of endianness.
+    FORMAT_RGBA,
+
+    // 4 bytes per pixel, in BGRA order in memory regardless of endianness.
+    // This is the default Windows DIB order.
+    FORMAT_BGRA
+  };
+
+  // Decodes the PNG data contained in input of length input_size. The
+  // decoded data will be placed in *output with the dimensions in *w and *h
+  // on success (returns true). This data will be written in the 'format'
+  // format. On failure, the values of these output variables are undefined.
+  //
+  // This function may not support all PNG types, and it hasn't been tested
+  // with a large number of images, so assume a new format may not work. It's
+  // really designed to be able to read in something written by Encode() above.
+  static bool Decode(const unsigned char* input, size_t input_size,
+                     ColorFormat format, std::vector<unsigned char>* output,
+                     int* w, int* h);
+
+  // A convenience function for decoding PNGs as previously encoded by the PNG
+  // encoder. Chrome encodes png in the format PNGDecoder::FORMAT_BGRA.
+  //
+  // Returns true if data is non-null and can be decoded as a png, false
+  // otherwise.
+  static bool Decode(const std::vector<unsigned char>* data, SkBitmap* icon);
+
+  // Create a SkBitmap from a decoded BGRA DIB. The caller owns the returned
+  // SkBitmap.
+  static SkBitmap* CreateSkBitmapFromBGRAFormat(
+      std::vector<unsigned char>& bgra, int width, int height);
+
+ private:
+  DISALLOW_EVIL_CONSTRUCTORS(PNGDecoder);
+};
+
+#endif  // BASE_GFX_PNG_DECODER_H__