[build] Enable gn build for vtune support in v8.

BUG=

Review-Url: https://codereview.chromium.org/2688483004
Cr-Commit-Position: refs/heads/master@{#43133}

BUILD.gn

@@ -41,6 +41,9 @@ declare_args() {
   # Sets -dENABLE_GDB_JIT_INTERFACE.
   v8_enable_gdbjit = ""
 
+  # Sets -dENABLE_VTUNE_JIT_INTERFACE.
+  v8_enable_vtunejit = false
+
   # Sets -dENABLE_HANDLE_ZAPPING.
   v8_enable_handle_zapping = true
 
@@ -197,6 +200,9 @@ config("features") {
   if (v8_enable_gdbjit) {
     defines += [ "ENABLE_GDB_JIT_INTERFACE" ]
   }
+  if (v8_enable_vtunejit) {
+    defines += [ "ENABLE_VTUNE_JIT_INTERFACE" ]
+  }
   if (v8_enable_object_print) {
     defines += [ "OBJECT_PRINT" ]
   }
@@ -2642,8 +2648,6 @@ v8_executable("d8") {
     "//build/win:default_exe_manifest",
   ]
 
-  # TODO(jochen): Add support for vtunejit.
-
   if (is_posix) {
     sources += [ "src/d8-posix.cc" ]
   } else if (is_win) {
@@ -2662,6 +2666,10 @@ v8_executable("d8") {
   if (v8_enable_inspector) {
     defines += [ "V8_INSPECTOR_ENABLED" ]
   }
+
+  if (v8_enable_vtunejit) {
+    deps += [ "//src/third_party/vtune:v8_vtune" ]
+  }
 }
 
 v8_isolate_run("d8") {

src/third_party/vtune/BUILD.gn

@@ -0,0 +1,20 @@
+# Copyright 2017 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("//build/toolchain/toolchain.gni")
+
+static_library("v8_vtune") {
+  sources = [
+    "ittnotify_config.h",
+    "ittnotify_types.h",
+    "jitprofiling.cc",
+    "jitprofiling.h",
+    "v8-vtune.h",
+    "vtune-jit.cc",
+    "vtune-jit.h",
+  ]
+  deps = [
+    "//:v8",
+  ]
+}