Parse image metadata when all data is received

Change AVIFImageDecoder::OnSetData() to parse the image metadata
automatically when all data is received. This meets the expectations of
ImageFrameGenerator::GetYUVAInfo() and
ImageFrameGenerator::DecodeToYUV().

In the ReadYUV() function in avif_image_decoder_test.cc, change the
IsSizeAvailable() call (which calls DecodeSize()) to
IsDecodedSizeAvailable() (which has no side effects) and call a few more
getter methods related to DecodeToYUV() to emulate the code in
ImageFrameGenerator::GetYUVAInfo() and
ImageFrameGenerator::DecodeToYUV().

Bug: 1149144
Bug: 1136922
Change-Id: I3790de99fd0e9745c4b3ab9555aa027f25a6d374
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2539329Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Commit-Queue: Wan-Teh Chang <wtc@google.com>
Cr-Commit-Position: refs/heads/master@{#827852}

third_party/blink/renderer/platform/image-decoders/avif/avif_image_decoder.cc

@@ -280,6 +280,12 @@ void AVIFImageDecoder::OnSetData(SegmentReader* data) {
   avif_io_data_.reader = data_.get();
   avif_io_data_.all_data_received = all_data_received;
   avif_io_.sizeHint = all_data_received ? data_->size() : kMaxAvifFileSize;
+
+  // ImageFrameGenerator::GetYUVAInfo() and ImageFrameGenerator::DecodeToYUV()
+  // assume that allow_decode_to_yuv_ and other image metadata are available
+  // after calling ImageDecoder::Create() with data_complete=true.
+  if (all_data_received)
+    ParseMetadata();
 }
 
 cc::YUVSubsampling AVIFImageDecoder::GetYUVSubsampling() const {

third_party/blink/renderer/platform/image-decoders/avif/avif_image_decoder_test.cc

@@ -514,8 +514,12 @@ void ReadYUV(const char* file_name,
   auto decoder = CreateAVIFDecoder();
   decoder->SetData(data.get(), true);
 
-  ASSERT_TRUE(decoder->IsSizeAvailable());
+  ASSERT_TRUE(decoder->IsDecodedSizeAvailable());
   ASSERT_TRUE(decoder->CanDecodeToYUV());
+  EXPECT_NE(decoder->GetYUVSubsampling(), cc::YUVSubsampling::kUnknown);
+  EXPECT_NE(decoder->GetYUVColorSpace(),
+            SkYUVColorSpace::kIdentity_SkYUVColorSpace);
+  EXPECT_EQ(decoder->GetYUVBitDepth(), bit_depth);
 
   IntSize size = decoder->DecodedSize();
   IntSize y_size = decoder->DecodedYUVSize(cc::YUVIndex::kY);