Deferred image decoding to handle broken GIFs

Source/platform/graphics/DeferredImageDecoder.cpp

Index: Source/platform/graphics/DeferredImageDecoder.cpp
diff --git a/Source/platform/graphics/DeferredImageDecoder.cpp b/Source/platform/graphics/DeferredImageDecoder.cpp
index 4a350c7064ea6959059a4075ca5c54c60160e4db..f6bb64f4da2b4521a0e0cf245298d8d1348e777f 100644
--- a/Source/platform/graphics/DeferredImageDecoder.cpp
+++ b/Source/platform/graphics/DeferredImageDecoder.cpp
@@ -227,6 +227,11 @@ void DeferredImageDecoder::prepareLazyDecodedFrames()
 
     const size_t previousSize = m_lazyDecodedFrames.size();
     m_lazyDecodedFrames.resize(m_actualDecoder->frameCount());
+
+    // We have encountered a broken image file. Simply bail.
+    if (m_lazyDecodedFrames.size() < previousSize)
+        return;
+
     for (size_t i = previousSize; i < m_lazyDecodedFrames.size(); ++i) {
         OwnPtr<ImageFrame> frame(adoptPtr(new ImageFrame()));
         frame->setSkBitmap(createBitmap(i));