blink: Fix frame completion querying for static images.

third_party/WebKit/Source/platform/image-decoders/png/PNGImageDecoderTest.cpp

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "platform/image-decoders/png/PNGImageDecoder.h"
 
 #include <memory>
 #include "platform/image-decoders/ImageDecoderTestHelpers.h"
 #include "png.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 1008 matching lines @@
     // Frame is not complete, even after decoding partially.
     EXPECT_FALSE(decoder->FrameIsCompleteAtIndex(0));
     auto* frame = decoder->FrameBufferAtIndex(0);
     ASSERT_TRUE(frame);
     EXPECT_NE(ImageFrame::kFrameComplete, frame->GetStatus());
     EXPECT_FALSE(decoder->FrameIsCompleteAtIndex(0));
 
     decoder->SetData(full_data.Get(), true);
 
     // With full data, parsing the size still does not mark a frame as
-    // complete.
+    // complete for animated images.
     EXPECT_TRUE(decoder->IsSizeAvailable());
-    EXPECT_FALSE(decoder->FrameIsCompleteAtIndex(0));
+    if (rec.expected_frame_count > 1)
+      EXPECT_FALSE(decoder->FrameIsCompleteAtIndex(0));
+    else
+      EXPECT_TRUE(decoder->FrameIsCompleteAtIndex(0));
 
     const auto frame_count = decoder->FrameCount();
     ASSERT_EQ(rec.expected_frame_count, frame_count);
 
-    if (frame_count > 1u) {
-      // After parsing (the full file), all frames are complete.
-      for (size_t i = 0; i < frame_count; ++i)
-        EXPECT_TRUE(decoder->FrameIsCompleteAtIndex(i));
-    } else {
-      // A single frame image is not reported complete until decoding.
-      EXPECT_FALSE(decoder->FrameIsCompleteAtIndex(0));
-    }
+    // After parsing (the full file), all frames are complete.
+    for (size_t i = 0; i < frame_count; ++i)
+      EXPECT_TRUE(decoder->FrameIsCompleteAtIndex(i));
 
     frame = decoder->FrameBufferAtIndex(0);
     ASSERT_TRUE(frame);
     EXPECT_EQ(ImageFrame::kFrameComplete, frame->GetStatus());
     EXPECT_TRUE(decoder->FrameIsCompleteAtIndex(0));
   }
 }
 
 TEST(PNGTests, sizeMayOverflow) {
   auto decoder =
       CreateDecoderWithPngData("/LayoutTests/images/resources/crbug702934.png");
   EXPECT_FALSE(decoder->IsSizeAvailable());
   EXPECT_TRUE(decoder->Failed());
 }
 
 };  // namespace blink