Remove opaque alpha channel special case

third_party/WebKit/Source/platform/graphics/DeferredImageDecoderTest.cpp

Index: third_party/WebKit/Source/platform/graphics/DeferredImageDecoderTest.cpp
diff --git a/third_party/WebKit/Source/platform/graphics/DeferredImageDecoderTest.cpp b/third_party/WebKit/Source/platform/graphics/DeferredImageDecoderTest.cpp
index 131c29af807d31bd6c51a3791869e33014b35a1c..85b6a3f95683390d0f0bfe0b5501feaf3eb16a68 100644
--- a/third_party/WebKit/Source/platform/graphics/DeferredImageDecoderTest.cpp
+++ b/third_party/WebKit/Source/platform/graphics/DeferredImageDecoderTest.cpp
@@ -353,7 +353,9 @@ TEST_F(DeferredImageDecoderTest, frameOpacity) {
     Vector<char> storage(size);
     SkPixmap pixmap(pixInfo, storage.data(), rowBytes);
 
-    // Before decoding, the frame is not known to be opaque.
+    // Before decoding, the frame's alpha is unknown and assumed to be
+    // transparent. This works well with partial decoding, which will be
+    // transparent until the full first frame is decoded.
     sk_sp<SkImage> frame = decoder->createFrameAtIndex(0);
     ASSERT_TRUE(frame);
     EXPECT_FALSE(frame->isOpaque());
@@ -364,7 +366,9 @@ TEST_F(DeferredImageDecoderTest, frameOpacity) {
     // After decoding, the frame is known to be opaque.
     frame = decoder->createFrameAtIndex(0);
     ASSERT_TRUE(frame);
-    EXPECT_TRUE(frame->isOpaque());
+    // The GIF file specifies it is opaque.
+    // Without the file, we remain at the default: transparent
+    EXPECT_EQ(testGIF, frame->isOpaque());
 
     // Re-generating the opaque-marked frame should not fail.
     EXPECT_TRUE(frame->readPixels(pixmap, 0, 0));