Adds Mojo IDL.

third_party/WebKit/Source/core/mojo/BUILD.gn

Index: third_party/WebKit/Source/core/mojo/BUILD.gn
diff --git a/third_party/WebKit/Source/core/mojo/BUILD.gn b/third_party/WebKit/Source/core/mojo/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..826c971c404b94b07b49c0610e9aa448fb85dbd9
--- /dev/null
+++ b/third_party/WebKit/Source/core/mojo/BUILD.gn
@@ -0,0 +1,20 @@
+# Copyright 2016 The Chromium Authors. All rights reserved.

[jbroman, 2016/12/20 23:21:57]

Would you mind also having a README.md that explains what this directory is? In
particular, I'm concerned people might be confused and think it's the general
way to use Mojo from Blink. It'd be nice to clear up that it's just the native
part of JS bindings to Mojo.

[alokp, 2017/01/09 23:33:09]

Done.

+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//third_party/WebKit/Source/core/core.gni")
+
+blink_core_sources("mojo") {
+  sources = [
+    "Mojo.cpp",
+    "Mojo.h",
+    "MojoHandle.cpp",
+    "MojoHandle.h",
+    "MojoWatcher.cpp",
+    "MojoWatcher.h",
+  ]
+
+  deps = [
+    "//mojo/public/cpp/system",
+  ]
+}