Port messages sent by WebIDBCursorImpl to Mojo.

mojo/public/cpp/bindings/associated_interface_ptr.h

 // Copyright 2015 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_ASSOCIATED_INTERFACE_PTR_H_
 #define MOJO_PUBLIC_CPP_BINDINGS_ASSOCIATED_INTERFACE_PTR_H_
 
 #include <stdint.h>
 
 #include <string>
@@ skipping 208 matching lines @@
         base::ThreadTaskRunnerHandle::Get()) {
   AssociatedInterfaceRequest<Interface> request;
   AssociatedInterfacePtrInfo<Interface> ptr_info;
   group->CreateAssociatedInterface(AssociatedGroup::WILL_PASS_REQUEST,
                                    &ptr_info, &request);
 
   ptr->Bind(std::move(ptr_info), std::move(runner));
   return request;
 }
 
+// Creates an associated interface proxy in its own AssociatedGroup.
+template <typename Interface>
+AssociatedInterfaceRequest<Interface> GetProxyForTesting(
+    AssociatedInterfacePtr<Interface>* ptr,
+    scoped_refptr<base::SingleThreadTaskRunner> runner =
+        base::ThreadTaskRunnerHandle::Get()) {
+  MessagePipe pipe;
+  using internal::MultiplexRouter;
+  scoped_refptr<MultiplexRouter> router0 = new MultiplexRouter(
+      std::move(pipe.handle0), MultiplexRouter::MULTI_INTERFACE, true, runner);
+  scoped_refptr<MultiplexRouter> router1 = new MultiplexRouter(
+      std::move(pipe.handle1), MultiplexRouter::MULTI_INTERFACE, false, runner);
+
+  AssociatedInterfacePtrInfo<Interface> ptr_info;
+  AssociatedInterfaceRequest<Interface> request;
+  router1->CreateAssociatedGroup()->CreateAssociatedInterface(
+      AssociatedGroup::WILL_PASS_PTR, &ptr_info, &request);
+
+  // Emulate passing |ptr_info| across a pipe.
+  ScopedInterfaceEndpointHandle handle = ptr_info.PassHandle();
+  CHECK(!handle.is_local());

[dcheng, 2016/11/21 10:31:57]

Nit: why CHECK? If this is something that should "never happen", it seems like
it ought to be a DCHECK per
https://chromium.googlesource.com/chromium/src/+/master/styleguide/c++/c++.md...

[Reilly Grant (use Gerrit), 2016/11/21 19:02:22]

Changed to DCHECK. This is testing code anyways.

+  ptr->Bind(AssociatedInterfacePtrInfo<Interface>(
+                router0->CreateLocalEndpointHandle(handle.release()),
+                ptr_info.version()),
+            std::move(runner));
+
+  return request;
+}
+
 // Creates an associated interface proxy which casts its messages into the void.
 template <typename Interface>
 void GetDummyProxyForTesting(AssociatedInterfacePtr<Interface>* proxy) {
   MessagePipe pipe;
   scoped_refptr<internal::MultiplexRouter> router =
       new internal::MultiplexRouter(std::move(pipe.handle0),
                                     internal::MultiplexRouter::MULTI_INTERFACE,
                                     false, base::ThreadTaskRunnerHandle::Get());
   std::unique_ptr<AssociatedGroup> group = router->CreateAssociatedGroup();
   GetProxy(proxy, group.get());
 }
 
 }  // namespace mojo
 
 #endif  // MOJO_PUBLIC_CPP_BINDINGS_ASSOCIATED_INTERFACE_PTR_H_