Factor PropertyTreeManager out of PaintArtifactCompositor.

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 881 matching lines @@
     "graphics/StrokeData.cpp",
     "graphics/StrokeData.h",
     "graphics/TextureHolder.h",
     "graphics/UnacceleratedImageBufferSurface.cpp",
     "graphics/UnacceleratedImageBufferSurface.h",
     "graphics/UnacceleratedStaticBitmapImage.cpp",
     "graphics/UnacceleratedStaticBitmapImage.h",
     "graphics/WebGraphicsContext3DProviderWrapper.h",
     "graphics/compositing/PaintArtifactCompositor.cpp",
     "graphics/compositing/PaintArtifactCompositor.h",
+    "graphics/compositing/PropertyTreeManager.cpp",
+    "graphics/compositing/PropertyTreeManager.h",
     "graphics/cpu/arm/WebGLImageConversionNEON.h",
     "graphics/cpu/mips/WebGLImageConversionMSA.h",
     "graphics/cpu/x86/WebGLImageConversionSSE.h",
     "graphics/filters/DistantLightSource.cpp",
     "graphics/filters/DistantLightSource.h",
     "graphics/filters/FEBlend.cpp",
     "graphics/filters/FEBlend.h",
     "graphics/filters/FEBoxReflect.cpp",
     "graphics/filters/FEBoxReflect.h",
     "graphics/filters/FEColorMatrix.cpp",
@@ skipping 1176 matching lines @@
     "//third_party/WebKit/Source:config",
     "//third_party/WebKit/Source:inside_blink",
   ]
 
   deps = [
     ":test_support",
     "//testing/gmock",
     "//testing/gtest",
   ]
 }