GN configs for ipc fuzzer.

tools/ipc_fuzzer/BUILD.gn

+# Copyright 2016 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.
+
+import("//tools/ipc_fuzzer/ipc_fuzzer.gni")
+
+config("ipc_fuzzer_config") {
+  defines = [ "ENABLE_IPC_FUZZER" ]
+}
+
+config("ipc_fuzzer_tool_config") {
+  defines = [
+    "ENABLE_IPC_FUZZER",
+    "USE_CUPS",

[Dirk Pranke, 2016/04/25 18:48:59]

I'm curious, why is USE_CUPS needed here?

[Oliver Chang, 2016/04/25 19:25:50]

I'm afraid I don't know, I just ported these from the GYP.

+  ]
+  include_dirs = [ "." ]
+}
+
+if (enable_ipc_fuzzer && (is_linux || is_mac || is_win)) {
+  assert(!is_component_build, "IPC fuzzer does not support component builds.")
+
+  group("ipc_fuzzer_all") {
+    deps = [
+      "//tools/ipc_fuzzer/fuzzer:ipc_fuzzer",
+      "//tools/ipc_fuzzer/message_dump:ipc_message_dump",
+      "//tools/ipc_fuzzer/message_replay:ipc_fuzzer_replay",
+      "//tools/ipc_fuzzer/message_tools:ipc_message_list",
+      "//tools/ipc_fuzzer/message_tools:ipc_message_util",
+    ]
+  }
+} else {
+  group("ipc_fuzzer_all") {
+  }
+}