GN configs for ipc fuzzer.

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index d89ba2cf03c3985fb25302d1c9f302b8b70f4620..8e5d341367bfe73d626a1bbb0d49256e4e3f0278 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -593,6 +593,10 @@ group("both_gn_and_gyp") {
       "//third_party/openh264:processing",
     ]
   }
+
+  if (enable_ipc_fuzzer && (is_linux || is_mac || is_win)) {
+    deps += [ "//tools/ipc_fuzzer:ipc_fuzzer_all" ]

[Dirk Pranke, 2016/04/22 23:18:11]

A convention we often follow here is to unconditionally  depend on
:ipc_fuzzer_all, but when we define ipc_fuzzer_all, define it to be an empty
group when you don't want it to do anything.

[Oliver Chang, 2016/04/25 18:16:06]

Done.

+  }
 }
 
 # This group contains all the targets needed to run mojo's apptest_runner.