Add UseCounters for BeforeInstallPromptEvent.

third_party/WebKit/Source/modules/app_banner/BeforeInstallPromptEvent.cpp

 // 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 "modules/app_banner/BeforeInstallPromptEvent.h"
 
 #include "bindings/core/v8/ScriptPromise.h"
 #include "core/dom/DOMException.h"
 #include "core/dom/ExceptionCode.h"
+#include "core/frame/UseCounter.h"
 #include "modules/app_banner/AppBannerCallbacks.h"
 #include "modules/app_banner/BeforeInstallPromptEventInit.h"
 #include "public/platform/modules/app_banner/WebAppBannerClient.h"
 
 namespace blink {
 
 BeforeInstallPromptEvent::BeforeInstallPromptEvent()
 {
 }
 
 BeforeInstallPromptEvent::BeforeInstallPromptEvent(const AtomicString& name, ExecutionContext* executionContext, const Vector<String>& platforms, int requestId, WebAppBannerClient* client)
     : Event(name, false, true)
     , m_platforms(platforms)
     , m_requestId(requestId)
     , m_client(client)
     , m_userChoice(new UserChoiceProperty(executionContext, this, UserChoiceProperty::UserChoice))
     , m_registered(false)
 {
+    UseCounter::count(executionContext, UseCounter::BeforeInstallPromptEvent);
 }
 
 BeforeInstallPromptEvent::BeforeInstallPromptEvent(const AtomicString& name, const BeforeInstallPromptEventInit& init)
     : Event(name, false, true)
     , m_requestId(-1)
     , m_client(nullptr)
 {
     if (init.hasPlatforms())
         m_platforms = init.platforms();
 }
 
 BeforeInstallPromptEvent::~BeforeInstallPromptEvent()
 {
 }
 
 Vector<String> BeforeInstallPromptEvent::platforms() const
 {
     return m_platforms;
 }
 
 ScriptPromise BeforeInstallPromptEvent::userChoice(ScriptState* scriptState)
 {
+    UseCounter::count(scriptState->getExecutionContext(), UseCounter::BeforeInstallPromptEventUserChoice);
     if (m_userChoice && m_client && m_requestId != -1) {
         if (!m_registered) {
             m_registered = true;
             m_client->registerBannerCallbacks(m_requestId, new AppBannerCallbacks(m_userChoice.get()));
         }
         return m_userChoice->promise(scriptState->world());
     }
     return ScriptPromise::rejectWithDOMException(scriptState, DOMException::create(InvalidStateError, "userChoice cannot be accessed on this event."));
 }
 
-const AtomicString& BeforeInstallPromptEvent::interfaceName() const
-{
-    return EventNames::BeforeInstallPromptEvent;
-}
-
 ScriptPromise BeforeInstallPromptEvent::prompt(ScriptState* scriptState)
 {
+    UseCounter::count(scriptState->getExecutionContext(), UseCounter::BeforeInstallPromptEventPrompt);
+
     // |m_registered| will be true if userChoice has already been accessed
     // or prompt() has already been called. Return a rejected promise in both
     // these cases, as well as if we have a null client or invalid requestId.
     if (m_registered || !defaultPrevented() || !m_client || m_requestId == -1)
         return ScriptPromise::rejectWithDOMException(scriptState, DOMException::create(InvalidStateError, "The prompt() method may only be called once, following preventDefault()."));
 
     m_registered = true;
     m_client->registerBannerCallbacks(m_requestId, new AppBannerCallbacks(m_userChoice.get()));
     m_client->showAppBanner(m_requestId);
     return ScriptPromise::castUndefined(scriptState);
 }
 
+const AtomicString& BeforeInstallPromptEvent::interfaceName() const
+{
+    return EventNames::BeforeInstallPromptEvent;
+}
+
+void BeforeInstallPromptEvent::preventDefault()
+{
+    Event::preventDefault();
+    UseCounter::count(target()->getExecutionContext(), UseCounter::BeforeInstallPromptEventPreventDefault);
+}
+
 DEFINE_TRACE(BeforeInstallPromptEvent)
 {
     visitor->trace(m_userChoice);
     Event::trace(visitor);
 }
 
 } // namespace blink