Include mojo/public/cpp/bindings/binding.h wherever mojo::Binding<> is used.

mojo/tests/task_tracker_perftest.cc

 // 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.
 
 #include <numeric>
 
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "base/timer/elapsed_timer.h"
 #include "base/tracked_objects.h"
 #include "mojo/common/message_pump_mojo.h"
+#include "mojo/public/cpp/bindings/binding.h"
 #include "mojo/public/cpp/environment/environment.h"
 #include "mojo/public/cpp/environment/task_tracker.h"
 #include "mojo/public/cpp/test_support/test_support.h"
 #include "mojo/public/cpp/test_support/test_utils.h"
 #include "mojo/public/interfaces/bindings/tests/sample_interfaces.mojom.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace mojo {
 namespace test {
 namespace {
@@ skipping 103 matching lines @@
   Environment::GetDefaultTaskTracker()->SetEnabled(false);
 }
 
 TEST_F(RequestResponsePerfTest, TrackingDisabled) {
   Measure(__FUNCTION__);
 }
 
 }  // namespace
 }  // namespace test
 }  // namespace mojo