[Extensions Bindings] Request JS execution from messaging bindings

extensions/renderer/native_extension_bindings_system_unittest.cc

 // Copyright 2016 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 "extensions/renderer/native_extension_bindings_system.h"
 
 #include "base/memory/ptr_util.h"
 #include "base/run_loop.h"
 #include "base/strings/stringprintf.h"
 #include "components/crx_file/id_util.h"
@@ skipping 582 matching lines @@
       "});";
   v8::Local<v8::Function> add_listener =
       FunctionFromString(context, kAddListener);
   EXPECT_CALL(*event_change_handler(),
               OnChange(binding::EventListenersChanged::HAS_LISTENERS,
                        script_context, kEventName, nullptr, true))
       .Times(1);
   v8::Local<v8::Value> argv[] = {listener};
   RunFunction(add_listener, context, arraysize(argv), argv);
   ::testing::Mock::VerifyAndClearExpectations(event_change_handler());
+  EXPECT_TRUE(bindings_system()->HasEventListenerInContext(
+      "idle.onStateChanged", script_context));
 
   // Remove the event listener. We should be notified again.
   const char kRemoveListener[] =
       "(function(listener) {\n"
       "  chrome.idle.onStateChanged.removeListener(listener);\n"
       "});";
   EXPECT_CALL(*event_change_handler(),
               OnChange(binding::EventListenersChanged::NO_LISTENERS,
                        script_context, kEventName, nullptr, true))
       .Times(1);
   v8::Local<v8::Function> remove_listener =
       FunctionFromString(context, kRemoveListener);
   RunFunction(remove_listener, context, arraysize(argv), argv);
   ::testing::Mock::VerifyAndClearExpectations(event_change_handler());
+  EXPECT_FALSE(bindings_system()->HasEventListenerInContext(
+      "idle.onStateChanged", script_context));
 }
 
 TEST_F(NativeExtensionBindingsSystemUnittest,
        TestPrefixedApiEventsAndAppBinding) {
   InitEventChangeHandler();
   scoped_refptr<Extension> app = CreateExtension("foo", ItemType::PLATFORM_APP,
                                                  std::vector<std::string>());
   EXPECT_TRUE(app->is_platform_app());
   RegisterExtension(app->id());
 
@@ skipping 416 matching lines @@
   v8::Local<v8::Function> add_listeners =
       FunctionFromString(context, kAddListeners);
   RunFunctionOnGlobal(add_listeners, context, 0, nullptr);
 
   // We should have no notifications for event listeners added (since the
   // mock is a strict mock, this will fail if anything was called).
   ::testing::Mock::VerifyAndClearExpectations(event_change_handler());
 }
 
 }  // namespace extensions