[inspector] added inspector test runner [part 1]

test/inspector/BUILD.gn

+# Copyright 2016 the V8 project 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("../../gni/v8.gni")
+
+v8_executable("inspector-test") {
+  testonly = true
+
+  sources = [
+    "task-runner.cc",
+    "task-runner.h",
+  ]
+
+  configs = [
+    "../..:external_config",
+    "../..:internal_config_base",
+  ]
+
+  deps = [
+    "../..:v8_libplatform",
+    "//build/config/sanitizers:deps",
+    "//build/win:default_exe_manifest",
+  ]
+
+  if (is_component_build) {
+    # inspector-test can't be built against a shared library, so we
+    # need to depend on the underlying static target in that case.
+    deps += [ "../..:v8_maybe_snapshot" ]
+  } else {
+    deps += [ "../..:v8" ]
+  }
+
+  cflags = []
+  ldflags = []
+}