Change skia build files to use a utils.gypi instead of hardcoded files.

skia/BUILD.gn

Index: skia/BUILD.gn
diff --git a/skia/BUILD.gn b/skia/BUILD.gn
index 74f6843d3ba30bf512abee72ba8ff9ab78e227be..7f9f974e394add50ff972afadcbf49aeb5c00b93 100644
--- a/skia/BUILD.gn
+++ b/skia/BUILD.gn
@@ -56,6 +56,15 @@ gypi_skia_effects = exec_script(
     "scope",
     [ "//third_party/skia/gyp/effects.gypi" ])
 
+# The list of Skia utilss that are to be set for chromium.
+gypi_skia_utils = exec_script(
+    "//build/gypi_to_gn.py",
+    [ rebase_path("//third_party/skia/gyp/utils.gypi"),
+      "--replace=<(skia_include_path)=//third_party/skia/include",
+      "--replace=<(skia_src_path)=//third_party/skia/src" ],
+    "scope",
+    [ "//third_party/skia/gyp/utils.gypi" ])
+
 # The list of Skia files is kept in skia_gn_files.gypi. Read it.
 gypi_values = exec_script(
     "//build/gypi_to_gn.py",
@@ -295,6 +304,7 @@ component("skia") {
   # The skia gypi values are relative to the skia_dir, so we need to rebase.
   sources += gypi_skia_core.sources
   sources += gypi_skia_effects.sources
+  sources += gypi_skia_utils.sources
   sources += gypi_skia_pdf.sources
   sources += gypi_values.skia_library_sources
 
@@ -304,6 +314,90 @@ component("skia") {
     sources += gypi_skia_gpu.skgpu_null_gl_sources
   }
 
+  # Remove unused util files include in utils.gypi
+  sources -= [
+  "//third_party/skia/include/utils/SkCondVar.h",
+  "//third_party/skia/include/utils/SkCountdown.h",
+  "//third_party/skia/include/utils/SkRunnable.h",
+  "//third_party/skia/include/utils/SkThreadPool.h",
+  "//third_party/skia/src/utils/SkCondVar.cpp",
+  "//third_party/skia/src/utils/SkCountdown.cpp",
+
+  "//third_party/skia/include/utils/SkBoundaryPatch.h",
+  "//third_party/skia/include/utils/SkFrontBufferedStream.h",
+  "//third_party/skia/include/utils/SkCamera.h",
+  "//third_party/skia/include/utils/SkCanvasStateUtils.h",
+  "//third_party/skia/include/utils/SkCubicInterval.h",
+  "//third_party/skia/include/utils/SkCullPoints.h",
+  "//third_party/skia/include/utils/SkDebugUtils.h",
+  "//third_party/skia/include/utils/SkDumpCanvas.h",
+  "//third_party/skia/include/utils/SkEventTracer.h",
+  "//third_party/skia/include/utils/SkInterpolator.h",
+  "//third_party/skia/include/utils/SkLayer.h",
+  "//third_party/skia/include/utils/SkMeshUtils.h",
+  "//third_party/skia/include/utils/SkNinePatch.h",
+  "//third_party/skia/include/utils/SkParse.h",
+  "//third_party/skia/include/utils/SkParsePaint.h",
+  "//third_party/skia/include/utils/SkParsePath.h",
+  "//third_party/skia/include/utils/SkRandom.h",
+  "//third_party/skia/include/utils/SkWGL.h",
+
+  "//third_party/skia/src/utils/SkBitmapHasher.cpp",
+  "//third_party/skia/src/utils/SkBitmapHasher.h",
+  "//third_party/skia/src/utils/SkBoundaryPatch.cpp",
+  "//third_party/skia/src/utils/SkFrontBufferedStream.cpp",
+  "//third_party/skia/src/utils/SkCamera.cpp",
+  "//third_party/skia/src/utils/SkCanvasStack.h",
+  "//third_party/skia/src/utils/SkCubicInterval.cpp",
+  "//third_party/skia/src/utils/SkCullPoints.cpp",
+  "//third_party/skia/src/utils/SkDumpCanvas.cpp",
+  "//third_party/skia/src/utils/SkFloatUtils.h",
+  "//third_party/skia/src/utils/SkGatherPixelRefsAndRects.cpp",
+  "//third_party/skia/src/utils/SkGatherPixelRefsAndRects.h",
+  "//third_party/skia/src/utils/SkInterpolator.cpp",
+  "//third_party/skia/src/utils/SkLayer.cpp",
+  "//third_party/skia/src/utils/SkMD5.cpp",
+  "//third_party/skia/src/utils/SkMD5.h",
+  "//third_party/skia/src/utils/SkMeshUtils.cpp",
+  "//third_party/skia/src/utils/SkNinePatch.cpp",
+  "//third_party/skia/src/utils/SkOSFile.cpp",
+  "//third_party/skia/src/utils/SkParse.cpp",
+  "//third_party/skia/src/utils/SkParseColor.cpp",
+  "//third_party/skia/src/utils/SkParsePath.cpp",
+  "//third_party/skia/src/utils/SkPathUtils.cpp",
+  "//third_party/skia/src/utils/SkSHA1.cpp",
+  "//third_party/skia/src/utils/SkSHA1.h",
+  "//third_party/skia/src/utils/SkThreadUtils.h",
+  "//third_party/skia/src/utils/SkThreadUtils_pthread.cpp",
+  "//third_party/skia/src/utils/SkThreadUtils_pthread.h",
+  "//third_party/skia/src/utils/SkThreadUtils_pthread_linux.cpp",
+  "//third_party/skia/src/utils/SkThreadUtils_pthread_mach.cpp",
+  "//third_party/skia/src/utils/SkThreadUtils_pthread_other.cpp",
+  "//third_party/skia/src/utils/SkThreadUtils_win.cpp",
+  "//third_party/skia/src/utils/SkTFitsIn.h",
+  "//third_party/skia/src/utils/SkTLogic.h",
+
+  #testing
+  "//third_party/skia/src/fonts/SkGScalerContext.cpp",
+  "//third_party/skia/src/fonts/SkGScalerContext.h",
+  ]
+
+  # need separate win section to handle chromes auto gn filter (build/config/BUILDCONFIG.gn)
+  if (is_win) {
+    sources -= [
+      "//third_party/skia/src/utils/SkThreadUtils_win.h",
+
+      #windows
+      "//third_party/skia/include/utils/win/SkAutoCoInitialize.h",
+      "//third_party/skia/include/utils/win/SkHRESULT.h",
+      "//third_party/skia/include/utils/win/SkIStream.h",
+      "//third_party/skia/include/utils/win/SkTScopedComPtr.h",
+      "//third_party/skia/src/utils/win/SkAutoCoInitialize.cpp",
+      "//third_party/skia/src/utils/win/SkIStream.cpp",
+      "//third_party/skia/src/utils/win/SkWGL_win.cpp",
+    ]
+  }
+
   # Fixup Chrome sources.
   if (is_posix) {
     sources -= [ "ext/SkThread_chrome.cc" ]