Add mojo::Binding<Interface> for more flexible pipe<->impl binding

mojo/services/test_service/test_request_tracker_impl.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_SERVICES_TEST_SERVICE_TEST_REQUEST_TRACKER_IMPL_H_
 #define MOJO_SERVICES_TEST_SERVICE_TEST_REQUEST_TRACKER_IMPL_H_
 
 #include "base/memory/weak_ptr.h"
 #include "mojo/public/cpp/system/macros.h"
 #include "mojo/services/test_service/test_request_tracker.mojom.h"
@@ skipping 15 matching lines @@
 };
 
 class TestRequestTrackerImpl : public InterfaceImpl<TestRequestTracker> {
  public:
   explicit TestRequestTrackerImpl(TrackingContext* context);
   ~TestRequestTrackerImpl() override;
 
   // TestRequestTracker.
   void RecordStats(uint64_t client_id, ServiceStatsPtr stats) override;
 
-  // InterfaceImpl override.
-  void OnConnectionEstablished() override;
+  void OnConnectionEstablished();
 
  private:
   void UploaderNameCallback(uint64_t id, const mojo::String& name);
   TrackingContext* context_;
   base::WeakPtrFactory<TestRequestTrackerImpl> weak_factory_;
   MOJO_DISALLOW_COPY_AND_ASSIGN(TestRequestTrackerImpl);
 };
 
 class TestTrackedRequestServiceImpl
     : public InterfaceImpl<TestTrackedRequestService> {
  public:
   explicit TestTrackedRequestServiceImpl(TrackingContext* context);
   ~TestTrackedRequestServiceImpl() override;
 
   // |TestTrackedRequestService| implementation.
   void GetReport(const mojo::Callback<void(mojo::Array<ServiceReportPtr>)>&
                      callback) override;
 
  private:
   TrackingContext* context_;
   MOJO_DISALLOW_COPY_AND_ASSIGN(TestTrackedRequestServiceImpl);
 };
 
 }  // namespace test
 }  // namespace mojo
 
 #endif  // MOJO_SERVICES_TEST_SERVICE_TEST_REQUEST_TRACKER_IMPL_H_