Adding unit test for DrawingBuffer's bitmap recycling mechanism

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/Source/build/scripts/scripts.gni")
 import("//third_party/WebKit/Source/config.gni")
@@ skipping 1920 matching lines @@
   visibility = []
   visibility = [ "//third_party/WebKit/Source/*" ]
   sources = [
     "graphics/Canvas2DLayerBridgeTest.cpp",
     "graphics/CanvasSurfaceLayerBridgeTest.cpp",
     "graphics/DeferredImageDecoderTest.cpp",
     "graphics/GraphicsLayerTest.cpp",
     "graphics/ImageDecodingStoreTest.cpp",
     "graphics/ImageFrameGeneratorTest.cpp",
     "graphics/ImageLayerChromiumTest.cpp",
+    "graphics/gpu/DrawingBufferSoftwareRenderingTest.cpp",
     "graphics/test/FakeGLES2Interface.h",
     "graphics/test/FakeWebGraphicsContext3DProvider.h",
     "graphics/test/MockImageDecoder.h",
   ]
 
   configs += [
     "//third_party/WebKit/Source:config",
     "//third_party/WebKit/Source:inside_blink",
   ]
 
   deps = [
     ":test_support",
     "//cc/surfaces:surface_id",
     "//testing/gmock",
     "//testing/gtest",
   ]
 }