Implements mojo::StrongBindingSet.

mojo/public/cpp/bindings/strong_binding_set.h

Index: mojo/public/cpp/bindings/strong_binding_set.h
diff --git a/mojo/public/cpp/bindings/strong_binding_set.h b/mojo/public/cpp/bindings/strong_binding_set.h
new file mode 100644
index 0000000000000000000000000000000000000000..f6bcd5259c07eb31db7cc4314f691a7f8d469158
--- /dev/null
+++ b/mojo/public/cpp/bindings/strong_binding_set.h
@@ -0,0 +1,26 @@
+// Copyright 2017 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_STRONG_BINDING_SET_H_
+#define MOJO_PUBLIC_CPP_BINDINGS_STRONG_BINDING_SET_H_
+
+#include "mojo/public/cpp/bindings/binding_set.h"
+#include "mojo/public/cpp/bindings/unique_ptr_impl_ref_traits.h"
+
+namespace mojo {
+
+// This class manages a set of bindings. When the pipe a binding is bound to is
+// disconnected, the binding is automatically destroyed and removed from the
+// set, and the interface implementation is deleted. When the StrongBindingSet
+// is destructed, all outstanding bindings in the set are destroyed and all the
+// bound interface implementations are automatically deleted.
+template <typename Interface, typename ContextType = void>

[xhwang, 2017/02/16 03:54:49]

The comment above is copied from media::StrongBindingSet. But in that interface
we don't have ContextType. So how would a user of this class know how to use
ContextType without looking at implementation details?

[xhwang, 2017/02/16 04:03:07]

Nevermind, I guess user of this class has to look at BindingSetBase anyways
since this is only a "using" alias.

+using StrongBindingSet =
+    BindingSetBase<Interface,
+                   Binding<Interface, UniquePtrImplRefTraits<Interface>>,
+                   ContextType>;
+
+}  // namespace mojo
+
+#endif  // MOJO_PUBLIC_CPP_BINDINGS_STRONG_BINDING_SET_H_