Allowing YUV data to be retrieved from the JPEG Decoder.

Source/platform/image-decoders/ImageDecoder.cpp

Index: Source/platform/image-decoders/ImageDecoder.cpp
diff --git a/Source/platform/image-decoders/ImageDecoder.cpp b/Source/platform/image-decoders/ImageDecoder.cpp
index 16940d10e1a02755c60140e30f8ea17ba2b7139c..7009a6e06cb585957fe8ef26a5874ece4adc55b8 100644
--- a/Source/platform/image-decoders/ImageDecoder.cpp
+++ b/Source/platform/image-decoders/ImageDecoder.cpp
@@ -82,6 +82,34 @@ inline bool matchesCURSignature(char* contents)
     return !memcmp(contents, "\x00\x00\x02\x00", 4);
 }
 
+DecodingBuffers::DecodingBuffers()
+{
+    for (int i = 0; i < 3; ++i) {
+        m_planes[i] = 0;
+        m_rowBytes[i] = 0;
+    }
+}
+
+void DecodingBuffers::set(void* planes[3], size_t rowBytes[3])
+{
+    for (int i = 0; i < 3; ++i) {
+        m_planes[i] = planes[i];
+        m_rowBytes[i] = rowBytes[i];
+    }
+}
+
+void* DecodingBuffers::getPlane(int i) const
+{
+    ASSERT((i >= 0) && i < 3);
+    return m_planes[i];
+}
+
+size_t DecodingBuffers::getRowBytes(int i) const
+{
+    ASSERT((i >= 0) && i < 3);
+    return m_rowBytes[i];
+}
+
 PassOwnPtr<ImageDecoder> ImageDecoder::create(const SharedBuffer& data, ImageSource::AlphaOption alphaOption, ImageSource::GammaAndColorProfileOption gammaAndColorProfileOption)
 {
     static const unsigned longestSignatureLength = sizeof("RIFF????WEBPVP") - 1;