Checking if frame is complete and access duration doesn't need a decode

Source/core/platform/graphics/chromium/DeferredImageDecoder.cpp

Index: Source/core/platform/graphics/chromium/DeferredImageDecoder.cpp
diff --git a/Source/core/platform/graphics/chromium/DeferredImageDecoder.cpp b/Source/core/platform/graphics/chromium/DeferredImageDecoder.cpp
index 870fb3da6281be170a49ebd5551c38e4f6f1fe7d..d681e830b1b41b5b2c15a4ff818fec4f57e5263e 100644
--- a/Source/core/platform/graphics/chromium/DeferredImageDecoder.cpp
+++ b/Source/core/platform/graphics/chromium/DeferredImageDecoder.cpp
@@ -185,6 +185,18 @@ bool DeferredImageDecoder::frameHasAlphaAtIndex(size_t index) const
     return m_actualDecoder ? m_actualDecoder->frameHasAlphaAtIndex(index) : m_frameGenerator->hasAlpha();
 }
 
+bool DeferredImageDecoder::frameIsCompleteAtIndex(size_t index) const
+{
+    // TODO: Implement this for deferred decoding.
+    return m_actualDecoder && m_actualDecoder->frameIsCompleteAtIndex(index);
+}
+
+float DeferredImageDecoder::frameDurationAtIndex(size_t index) const
+{
+    // TODO: Implement this for deferred decoding.
+    return m_actualDecoder ? m_actualDecoder->frameDurationAtIndex(index) : 0;
+}
+
 unsigned DeferredImageDecoder::frameBytesAtIndex(size_t index) const
 {
     // If frame decoding is deferred then it is not managed by MemoryCache