GN: add sanitize arg

infra/bots/recipes/swarm_compile.expected/Build-Ubuntu-GCC-x86_64-Debug-MSAN.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "\nimport sys, os\npath = sys.argv[1]\nmode = int(sys.argv[2])\nif not os.path.isdir(path):\n  if os.path.exists(path):\n    print \"%s exists but is not a dir\" % path\n    sys.exit(1)\n  os.makedirs(path, mode)\n",
       "[CUSTOM_/_B_WORK]",
       "511"
     ],
     "name": "makedirs checkout_path",
@@ skipping 10 matching lines @@
       "@@@STEP_LOG_END@python.inline@@@"
     ]
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_PACKAGE_REPO[depot_tools]/gclient.py",
       "config",
       "--spec",
-      "cache_dir = '[CUSTOM_/_B_CACHE]'\nsolutions = [{'deps_file': 'DEPS', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}, {'deps_file': 'DEPS', 'managed': False, 'name': 'src', 'url': 'https://chromium.googlesource.com/chromium/src.git'}]\ntarget_os = ['llvm']"
+      "cache_dir = '[CUSTOM_/_B_CACHE]'\nsolutions = [{'deps_file': 'DEPS', 'managed': False, 'name': 'skia', 'url': 'https://skia.googlesource.com/skia.git'}]\ntarget_os = ['llvm']"
     ],
     "cwd": "[CUSTOM_/_B_WORK]",
     "env": {
       "BUILDTYPE": "Debug",
       "CHROME_HEADLESS": "1",
       "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]",
       "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Ubuntu-GCC-x86_64-Debug-MSAN"
     },
     "name": "gclient setup"
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_PACKAGE_REPO[depot_tools]/gclient.py",
       "sync",
       "--nohooks",
       "--force",
       "--verbose",
       "--delete_unversioned_trees",
       "--revision",
       "skia@abc123",
-      "--revision",
-      "src@origin/lkgr",
       "--output-json",
       "/path/to/tmp/json"
     ],
     "cwd": "[CUSTOM_/_B_WORK]",
     "env": {
       "BUILDTYPE": "Debug",
       "CHROME_HEADLESS": "1",
       "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]:RECIPE_PACKAGE_REPO[depot_tools]",
       "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Ubuntu-GCC-x86_64-Debug-MSAN"
     },
     "name": "gclient sync",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@{@@@",
       "@@@STEP_LOG_LINE@json.output@  \"solutions\": {@@@",
       "@@@STEP_LOG_LINE@json.output@    \"skia/\": {@@@",
       "@@@STEP_LOG_LINE@json.output@      \"revision\": 164710@@@",
-      "@@@STEP_LOG_LINE@json.output@    }, @@@",
-      "@@@STEP_LOG_LINE@json.output@    \"src/\": {@@@",
-      "@@@STEP_LOG_LINE@json.output@      \"revision\": 170242@@@",
       "@@@STEP_LOG_LINE@json.output@    }@@@",
       "@@@STEP_LOG_LINE@json.output@  }@@@",
       "@@@STEP_LOG_LINE@json.output@}@@@",
       "@@@STEP_LOG_END@json.output@@@",
       "@@@SET_BUILD_PROPERTY@got_revision@164710@@@"
     ]
   },
   {
     "cmd": [
-      "python",
-      "-u",
-      "RECIPE_PACKAGE_REPO[depot_tools]/gclient.py",
-      "runhooks"
+      "[CUSTOM_/_B_WORK]/skia/bin/fetch-gn"
     ],
-    "cwd": "[CUSTOM_/_B_WORK]",
+    "cwd": "[CUSTOM_/_B_WORK]/skia",
     "env": {
-      "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
+      "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]:RECIPE_PACKAGE_REPO[depot_tools]"
     },
-    "name": "gclient runhooks"
+    "name": "fetch-gn"
   },
   {
     "cmd": [
-      "[CUSTOM_/_B_WORK]/skia/tools/xsan_build",
-      "memory",
-      "dm"
+      "gn",
+      "gen",
+      "[CUSTOM_/_B_WORK]/skia/out/Build-Ubuntu-GCC-x86_64-Debug-MSAN/Debug",
+      "--args=cc=\"gcc\" cxx=\"g++\" extra_ldflags=\"-L[SLAVE_BUILD]/clang_linux/msan\" sanitize=\"MSAN\" skia_use_fontconfig=false"
     ],
     "cwd": "[CUSTOM_/_B_WORK]/skia",
     "env": {
-      "BUILDTYPE": "Debug",
-      "CHROME_HEADLESS": "1",
-      "GYP_DEFINES": "skia_arch_type=x86_64 skia_warnings_as_errors=1",
-      "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Ubuntu-GCC-x86_64-Debug-MSAN"
+      "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]:RECIPE_PACKAGE_REPO[depot_tools]"
     },
-    "name": "build dm"
+    "name": "gn gen"
   },
   {
     "cmd": [
-      "[CUSTOM_/_B_WORK]/skia/tools/xsan_build",
-      "memory",
-      "nanobench"
+      "ninja",
+      "-C",
+      "[CUSTOM_/_B_WORK]/skia/out/Build-Ubuntu-GCC-x86_64-Debug-MSAN/Debug"
     ],
     "cwd": "[CUSTOM_/_B_WORK]/skia",
     "env": {
-      "BUILDTYPE": "Debug",
-      "CHROME_HEADLESS": "1",
-      "GYP_DEFINES": "skia_arch_type=x86_64 skia_warnings_as_errors=1",
-      "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]:RECIPE_PACKAGE_REPO[depot_tools]",
-      "SKIA_OUT": "[CUSTOM_/_B_WORK]/skia/out/Build-Ubuntu-GCC-x86_64-Debug-MSAN"
+      "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]:RECIPE_PACKAGE_REPO[depot_tools]"
     },
-    "name": "build nanobench"
+    "name": "ninja"
   },
   {
     "cmd": [
+      "[CUSTOM_/_B_WORK]/skia/bin/fetch-gn"
+    ],
+    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "env": {
+      "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]:RECIPE_PACKAGE_REPO[depot_tools]"
+    },
+    "name": "fetch-gn (2)"
+  },
+  {
+    "cmd": [
+      "gn",
+      "gen",
+      "[CUSTOM_/_B_WORK]/skia/out/Build-Ubuntu-GCC-x86_64-Debug-MSAN/Debug",
+      "--args=cc=\"gcc\" cxx=\"g++\" extra_ldflags=\"-L[SLAVE_BUILD]/clang_linux/msan\" sanitize=\"MSAN\" skia_use_fontconfig=false"
+    ],
+    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "env": {
+      "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]:RECIPE_PACKAGE_REPO[depot_tools]"
+    },
+    "name": "gn gen (2)"
+  },
+  {
+    "cmd": [
+      "ninja",
+      "-C",
+      "[CUSTOM_/_B_WORK]/skia/out/Build-Ubuntu-GCC-x86_64-Debug-MSAN/Debug"
+    ],
+    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "env": {
+      "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]:RECIPE_PACKAGE_REPO[depot_tools]"
+    },
+    "name": "ninja (2)"
+  },
+  {
+    "cmd": [
       "python",
       "-u",
       "import errno\nimport glob\nimport os\nimport shutil\nimport sys\n\nsrc = sys.argv[1]\ndst = sys.argv[2]\nbuild_products_whitelist = ['dm', 'dm.exe', 'get_images_from_skps', 'get_images_from_skps.exe', 'nanobench', 'nanobench.exe', '*.so', '*.dll', '*.dylib', 'skia_launcher', 'lib/*.so', 'iOSShell.app', 'iOSShell.ipa', 'visualbench', 'visualbench.exe', 'vulkan-1.dll']\n\ntry:\n  os.makedirs(dst)\nexcept OSError as e:\n  if e.errno != errno.EEXIST:\n    raise\n\nfor pattern in build_products_whitelist:\n  path = os.path.join(src, pattern)\n  for f in glob.glob(path):\n    dst_path = os.path.join(dst, os.path.relpath(f, src))\n    if not os.path.isdir(os.path.dirname(dst_path)):\n      os.makedirs(os.path.dirname(dst_path))\n    print 'Copying build product %s to %s' % (f, dst_path)\n    shutil.move(f, dst_path)\n",
       "[CUSTOM_/_B_WORK]/skia/out/Build-Ubuntu-GCC-x86_64-Debug-MSAN/Debug",
       "[CUSTOM_[SWARM_OUT_DIR]]/out/Debug"
     ],
     "name": "copy build products",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@python.inline@import errno@@@",
       "@@@STEP_LOG_LINE@python.inline@import glob@@@",
@@ skipping 16 matching lines @@
       "@@@STEP_LOG_LINE@python.inline@  for f in glob.glob(path):@@@",
       "@@@STEP_LOG_LINE@python.inline@    dst_path = os.path.join(dst, os.path.relpath(f, src))@@@",
       "@@@STEP_LOG_LINE@python.inline@    if not os.path.isdir(os.path.dirname(dst_path)):@@@",
       "@@@STEP_LOG_LINE@python.inline@      os.makedirs(os.path.dirname(dst_path))@@@",
       "@@@STEP_LOG_LINE@python.inline@    print 'Copying build product %s to %s' % (f, dst_path)@@@",
       "@@@STEP_LOG_LINE@python.inline@    shutil.move(f, dst_path)@@@",
       "@@@STEP_LOG_END@python.inline@@@"
     ]
   },
   {
-    "cmd": [
-      "python",
-      "-u",
-      "\nimport shutil\nimport sys\nshutil.copytree(sys.argv[1], sys.argv[2], symlinks=bool(sys.argv[3]))\n",
-      "[CUSTOM_/_B_WORK]/skia/third_party/externals/llvm/msan_out",
-      "[CUSTOM_[SWARM_OUT_DIR]]/third_party/externals/llvm/msan_out",
-      "1"
-    ],
-    "name": "copy msan_out"
-  },
-  {
-    "cmd": [
-      "python",
-      "-u",
-      "\nimport shutil\nimport sys\nshutil.copytree(sys.argv[1], sys.argv[2], symlinks=bool(sys.argv[3]))\n",
-      "[CUSTOM_/_B_WORK]/src/third_party/llvm-build",
-      "[CUSTOM_[SWARM_OUT_DIR]]/llvm-build",
-      "1"
-    ],
-    "name": "copy llvm-build"
-  },
-  {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]