Add tests for PNGImageDecoder.

third_party/WebKit/Source/platform/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//testing/libfuzzer/fuzzer_test.gni")
 import("//testing/test.gni")
 import("//third_party/WebKit/public/public_features.gni")
 import("//third_party/WebKit/Source/build/scripts/scripts.gni")
@@ skipping 1728 matching lines @@
     "graphics/paint/PaintChunkerTest.cpp",
     "graphics/paint/PaintControllerTest.cpp",
     "image-decoders/FastSharedBufferReaderTest.cpp",
     "image-decoders/ImageDecoderTest.cpp",
     "image-decoders/ImageDecoderTestHelpers.cpp",
     "image-decoders/ImageDecoderTestHelpers.h",
     "image-decoders/bmp/BMPImageDecoderTest.cpp",
     "image-decoders/gif/GIFImageDecoderTest.cpp",
     "image-decoders/ico/ICOImageDecoderTest.cpp",
     "image-decoders/jpeg/JPEGImageDecoderTest.cpp",
+    "image-decoders/png/PNGImageDecoderTest.cpp",
     "image-decoders/webp/WEBPImageDecoderTest.cpp",
     "json/JSONParserTest.cpp",
     "json/JSONValuesTest.cpp",
     "mac/VersionUtilMacTest.mm",
     "mojo/CommonCustomTypesStructTraitsTest.cpp",
     "mojo/GeometryStructTraitsTest.cpp",
     "mojo/KURLSecurityOriginTest.cpp",
     "network/EncodedFormDataTest.cpp",
     "network/HTTPParsersTest.cpp",
     "network/LinkHeaderTest.cpp",
@@ skipping 306 matching lines @@
     "//third_party/WebKit/Source:inside_blink",
   ]
 
   deps = [
     ":test_support",
     "//cc/surfaces:surface_id",
     "//testing/gmock",
     "//testing/gtest",
   ]
 }