blink: Fix frame completion querying for static images.

third_party/WebKit/Source/platform/image-decoders/ImageDecoder.cpp

Index: third_party/WebKit/Source/platform/image-decoders/ImageDecoder.cpp
diff --git a/third_party/WebKit/Source/platform/image-decoders/ImageDecoder.cpp b/third_party/WebKit/Source/platform/image-decoders/ImageDecoder.cpp
index e7eac4b4a3f696ab1f6871dafc99fab7d4d1b4e3..554a5bc785890d4b4e1ca5a732dccde65fd5fd95 100644
--- a/third_party/WebKit/Source/platform/image-decoders/ImageDecoder.cpp
+++ b/third_party/WebKit/Source/platform/image-decoders/ImageDecoder.cpp
@@ -187,8 +187,14 @@ bool ImageDecoder::FrameHasAlphaAtIndex(size_t index) const {
 }
 
 bool ImageDecoder::FrameIsCompleteAtIndex(size_t index) const {
-  return (index < frame_buffer_cache_.size()) &&
-         (frame_buffer_cache_[index].GetStatus() == ImageFrame::kFrameComplete);
+  // Animated images override this method to return the status based on the data
+  // received for the queried frame.
+  return IsAllDataReceived();

[scroggo_chromium, 2017/05/30 15:51:34]

Yay! I like that this method now means the same thing for animated images and
non-animated images.

+}
+
+bool ImageDecoder::FrameIsDecodedAtIndex(size_t index) const {
+  return index < frame_buffer_cache_.size() &&
+         frame_buffer_cache_[index].GetStatus() == ImageFrame::kFrameComplete;
 }
 
 size_t ImageDecoder::FrameBytesAtIndex(size_t index) const {