Mojo: introducing a thread safe interface pointer.

mojo/public/cpp/bindings/interface_ptr.h

 // Copyright 2014 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.
 
 #ifndef MOJO_PUBLIC_CPP_BINDINGS_INTERFACE_PTR_H_
 #define MOJO_PUBLIC_CPP_BINDINGS_INTERFACE_PTR_H_
 
 #include <stdint.h>
 
 #include <string>
@@ skipping 88 matching lines @@
   // Returns the version number of the interface that the remote side supports.
   uint32_t version() const { return internal_state_.version(); }
 
   // Queries the max version that the remote side supports. On completion, the
   // result will be returned as the input of |callback|. The version number of
   // this interface pointer will also be updated.
   void QueryVersion(const base::Callback<void(uint32_t)>& callback) {
     internal_state_.QueryVersion(callback);
   }
 
+  // Returns a thread safe interface pointer that can be used to make interface
+  // calls from any thread. The callbacks are invoked on the thread the
+  // interface method is called from.
+  scoped_refptr<ThreadSafeInterfacePtr<Interface>> GetThreadSafePtr() {
+    return internal_state_.GetThreadSafePtr();
+  }
+
   // If the remote side doesn't support the specified version, it will close its
   // end of the message pipe asynchronously. This does nothing if it's already
   // known that the remote side supports the specified version, i.e., if
   // |version <= this->version()|.
   //
   // After calling RequireVersion() with a version not supported by the remote
   // side, all subsequent calls to interface methods will be ignored.
   void RequireVersion(uint32_t version) {
     internal_state_.RequireVersion(version);
   }
@@ skipping 121 matching lines @@
         base::ThreadTaskRunnerHandle::Get()) {
   InterfacePtr<Interface> ptr;
   if (info.is_valid())
     ptr.Bind(std::move(info), std::move(runner));
   return std::move(ptr);
 }
 
 }  // namespace mojo
 
 #endif  // MOJO_PUBLIC_CPP_BINDINGS_INTERFACE_PTR_H_