Adds Mojo IDL.

third_party/WebKit/Source/core/mojo/MojoHandle.cpp

Index: third_party/WebKit/Source/core/mojo/MojoHandle.cpp
diff --git a/third_party/WebKit/Source/core/workers/WorkerClients.cpp b/third_party/WebKit/Source/core/mojo/MojoHandle.cpp
similarity index 60%
copy from third_party/WebKit/Source/core/workers/WorkerClients.cpp
copy to third_party/WebKit/Source/core/mojo/MojoHandle.cpp
index 9b445cbf130a09afce530d17f51dce59081b987c..b9a7fe00bb72243c6b833cccad747d8bcab75a1b 100644
--- a/third_party/WebKit/Source/core/workers/WorkerClients.cpp
+++ b/third_party/WebKit/Source/core/mojo/MojoHandle.cpp
@@ -2,10 +2,12 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "core/workers/WorkerClients.h"
+#include "core/mojo/MojoHandle.h"
 
 namespace blink {
 
-template class CORE_TEMPLATE_EXPORT Supplement<WorkerClients>;
+MojoHandle::MojoHandle(::MojoHandle handle) : MojoScopedHandle(handle) {}
+
+MojoHandle::~MojoHandle() {}
 
 }  // namespace blink