blink: Allow image decodes to work without a Platform

Source/platform/image-decoders/ImageDecoder.cpp

 /*
  * Copyright (C) Research In Motion Limited 2009-2010. All rights reserved.
  *
  *  This library is free software; you can redistribute it and/or
  *  modify it under the terms of the GNU Library General Public
  *  License as published by the Free Software Foundation; either
  *  version 2 of the License, or (at your option) any later version.
  *
  *  This library is distributed in the hope that it will be useful,
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 70 matching lines @@
 inline bool matchesBMPSignature(char* contents)
 {
     return !memcmp(contents, "BM", 2);
 }
 
 PassOwnPtr<ImageDecoder> ImageDecoder::create(const SharedBuffer& data, ImageSource::AlphaOption alphaOption, ImageSource::GammaAndColorProfileOption gammaAndColorProfileOption)
 {
     const unsigned longestSignatureLength = sizeof("RIFF????WEBPVP") - 1;
     ASSERT(longestSignatureLength == 14);
 
-    size_t maxDecodedBytes = Platform::current()->maxDecodedImageBytes();
+    size_t maxDecodedBytes = Platform::current() ? Platform::current()->maxDecodedImageBytes() : noDecodedImageByteLimit;
 
     char contents[longestSignatureLength];
     if (copyFromSharedBuffer(contents, longestSignatureLength, data, 0) < longestSignatureLength)
         return nullptr;
 
     if (matchesJPEGSignature(contents))
         return adoptPtr(new JPEGImageDecoder(alphaOption, gammaAndColorProfileOption, maxDecodedBytes));
 
     if (matchesPNGSignature(contents))
         return adoptPtr(new PNGImageDecoder(alphaOption, gammaAndColorProfileOption, maxDecodedBytes));
@@ skipping 153 matching lines @@
     return m_planes[i];
 }
 
 size_t ImagePlanes::rowBytes(int i) const
 {
     ASSERT((i >= 0) && i < 3);
     return m_rowBytes[i];
 }
 
 } // namespace blink