Build javascript unit tests with gn.

chrome/test/BUILD.gn

Index: chrome/test/BUILD.gn
diff --git a/chrome/test/BUILD.gn b/chrome/test/BUILD.gn
index 0d0e9646f9c8686f18691e808a87abc70b30bfd8..e1fa372514fd9e4cdf8f1eb330e5183354ea0389 100644
--- a/chrome/test/BUILD.gn
+++ b/chrome/test/BUILD.gn
@@ -505,7 +505,9 @@ if (!is_android) {
     }
   }
 
-  template("js2webui") {
+  template("js2gtest") {
+    assert(defined(invoker.test_type) &&
+           (invoker.test_type == "webui" || invoker.test_type == "unit"))
     action_name = target_name + "_action"
     source_set_name = target_name
 
@@ -531,14 +533,14 @@ if (!is_android) {
 
       outputs = [
         "$target_gen_dir/{{source_name_part}}-gen.cc",
-        "$root_out_dir/test_data/chrome/{{source_root_relative_dir}}/{{source_file_part}}",
+        "$root_out_dir/test_data/{{source_root_relative_dir}}/{{source_file_part}}",
       ]
 
       args = [
         # Need "./" for script to find binary (cur dir is not on path).
         "./" + rebase_path(d8_path, root_build_dir),
       ]
-      args += rebase_path(input_js, root_build_dir) + [ "webui" ]
+      args += rebase_path(input_js, root_build_dir) + [ invoker.test_type ]
       if (v8_use_external_startup_data) {
         args += [ "--external=y" ]
       } else {
@@ -555,13 +557,25 @@ if (!is_android) {
       ]
     }
 
+    if (defined(invoker.extra_js_files)) {
+      copy_target_name = target_name + "_copy"
+      copy(copy_target_name) {
+        visibility = [ ":$source_set_name" ]
+        sources = invoker.extra_js_files
+        outputs = [
+          "$root_out_dir/test_data/{{source_root_relative_dir}}/{{source_file_part}}",
+        ]
+      }
+    }
     source_set(source_set_name) {
       testonly = true
       if (defined(invoker.visibility)) {
         visibility = invoker.visibility
       }
       sources = get_target_outputs(":$action_name")
-      defines = [ "HAS_OUT_OF_PROC_TEST_RUNNER" ]
+      if (defined(invoker.defines)) {
+        defines = invoker.defines
+      }
       deps = [
         ":$action_name",
 
@@ -573,10 +587,14 @@ if (!is_android) {
       if (defined(invoker.deps)) {
         deps += invoker.deps
       }
+      if (defined(invoker.extra_js_files)) {
+        data_deps = [ ":$copy_target_name" ]
+      }
     }
   }
 
-  js2webui("browser_tests_js_webui") {
+  js2gtest("browser_tests_js_webui") {
+    test_type = "webui"
     sources = rebase_path(
             chrome_tests_gypi_values.chrome_browser_tests_webui_js_sources,
             ".",
@@ -599,6 +617,7 @@ if (!is_android) {
       "//chrome/browser/ui",
       "//skia",
     ]
+    defines = [ "HAS_OUT_OF_PROC_TEST_RUNNER" ]
   }
 
   test("browser_tests") {
@@ -1196,6 +1215,26 @@ if (!is_android) {
                                  "scope",
                                  [ "../chrome_tests_unit.gypi" ])
 
+  js2gtest("unit_tests_js") {
+    test_type = "unit"
+    sources = rebase_path(unit_gypi_values.chrome_unit_tests_gtestjs_sources,
+                          ".",
+                          "//chrome")
+    extra_js_files = rebase_path(unit_gypi_values.chrome_unit_tests_js_sources,
+                                 ".",
+                                 "//chrome")
+    if (is_chromeos) {
+      sources += rebase_path(
+              unit_gypi_values.chrome_unit_tests_chromeos_gtestjs_sources,
+              ".",
+              "//chrome")
+      extra_js_files +=
+          rebase_path(unit_gypi_values.chrome_unit_tests_chromeos_js_sources,
+                      ".",
+                      "//chrome")
+    }
+  }
+
   test("unit_tests") {
     sources =
         rebase_path(unit_gypi_values.chrome_unit_tests_sources, ".", "//chrome")
@@ -1250,6 +1289,7 @@ if (!is_android) {
 
     if (!is_ios) {
       deps += [
+        ":unit_tests_js",
         "//components/audio_modem:audio_modem_test_support",
         "//components/autofill/content/browser:test_support",
         "//components/metrics/proto",