Run the webkit layout tests under swarming on linux_chromium_rel_ng.

BUILD.gn

 # Copyright (c) 2013 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.
 
 # This is the root build file for GN. GN will start processing by loading this
 # file, and recursively load all dependencies until all dependencies are either
 # resolved or known not to exist (which will cause the build to fail). So if
 # you add a new build file, there must be some path of dependencies from this
 # file to your new one or GN won't know about it.
 
@@ skipping 890 matching lines @@
   }
 }
 
 if (!is_ios) {
   # This group includes all of the targets needed to build and test Blink,
   # including running the layout tests (see below).
   group("blink_tests") {
     testonly = true
 
     deps = [
       ":webkit_layout_tests",

[qyearsley, 2017/01/13 01:09:11]

Note, when trying this locally I got a warning at some point before changing
instances of "webkit_layout_tests" to "webkit_layout_tests_exparchive".

       "//third_party/WebKit/public:all_blink",
     ]
   }
 
   # Layout tests runner
   # third_party/WebKit/Tools/Scripts/run-webkit-tests
   group("run_webkit_tests") {
     testonly = true
     deps = [
       ":webkit_layout_tests",
     ]
   }
 
   # https://www.chromium.org/developers/testing/webkit-layout-tests
-  group("webkit_layout_tests") {
+
+  # TODO(dpranke): Get rid of this target once webkit_layout_tests_exparchive
+  # works reliably.
+  group("locally_swarmed_webkit_layout_tests") {
     testonly = true
 
+    deps = [
+      ":webkit_layout_tests_exparchive",
+    ]
+
+    data = [
+      # In addition to the test script, these files are needed for the
+      # test script to be able to call MB, GN, and the swarming and isolate
+      # binaries.
+      "//build/gn_helpers.py",
+      "//buildtools/",
+      "//testing/scripts/common.py",
+      "//testing/scripts/run_locally_swarmed_webkit_layout_tests.py",
+      "//tools/mb/",
+      "//tools/luci-go/",
+      "//tools/swarming_client/",
+    ]
+  }
+
+  # The _exparchive at the end of the name indicates to the isolate recipe
+  # that the isolate should be archived separately using the `exparchive`
+  # command, rather than as part of the normal `batcharchive` command.
+  group("webkit_layout_tests_exparchive") {
+    testonly = true
+    deps = [
+      ":some_webkit_layout_tests",
+    ]
+    data_deps = [
+      ":some_webkit_layout_tests",
+    ]
+
+    data = [
+      "//third_party/WebKit/LayoutTests/",
+    ]
+  }
+
+  # This target contains only a small subset of the layout tests,
+  # and is useful for testing with the regular isolate mechanism.
+  # To run the full layout test suite you need to use
+  # :webkit_layout_tests_exparchive, above, instead.
+  group("some_webkit_layout_tests") {
+    testonly = true
     data_deps = [
       "//content/shell:content_shell",
       "//tools/imagediff",
     ]
 
     if (is_android) {
       data_deps += [
         "//breakpad:breakpad_unittests",
         "//breakpad:dump_syms",
         "//breakpad:microdump_stackwalk",
@@ skipping 16 matching lines @@
       data_deps += [ "//breakpad:dump_syms($host_toolchain)" ]
     }
 
     if (is_linux) {
       data_deps += [ "//breakpad:dump_syms($host_toolchain)" ]
     }
 
     data = [
       "//testing/scripts/common.py",
       "//testing/xvfb.py",
-      "//testing/scripts/run_telemetry_as_googletest.py",
-      "//third_party/WebKit/LayoutTests/",
+      "//testing/scripts/run_isolated_script_test.py",
+      "//third_party/WebKit/LayoutTests/NeverFixTests",
+      "//third_party/WebKit/LayoutTests/SlowTests",
+      "//third_party/WebKit/LayoutTests/SmokeTests",
+      "//third_party/WebKit/LayoutTests/StaleTestExpectations",
+      "//third_party/WebKit/LayoutTests/TestExpectations",
+      "//third_party/WebKit/LayoutTests/VirtualTestSuites",
+      "//third_party/WebKit/LayoutTests/fast/html/",
       "//third_party/WebKit/Tools/Scripts/",
       "$root_build_dir/resources/inspector/",
     ]
+
+    if (is_android) {
+      data += [
+        "//third_party/catapult/",
+        "//build/android/",
+      ]
+    }
   }
 }
 
 # Add a dummy target for compatibility w/ GYP
 group("chromium_swarm_tests") {
 }
 
 group("chromium_builder_perf") {
   testonly = true
 
@@ skipping 112 matching lines @@
   assert(target_name != "")  # Mark as used.
   sources = invoker.actual_sources
   assert(
       sources == invoker.actual_sources,
       "Do not use a platform name in your output directory (found \"$root_build_dir\"). http://crbug.com/548283")
 }
 
 assert_valid_out_dir("_unused") {
   actual_sources = [ "$root_build_dir/foo" ]
 }