Change beforeinstallprompt event to take an array of platforms.

Source/modules/app_banner/BeforeInstallPromptEvent.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 BeforeInstallPromptEvent_h
 #define BeforeInstallPromptEvent_h
 
 #include "modules/EventModules.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 class BeforeInstallPromptEventInit;
 
 class BeforeInstallPromptEvent final : public Event {
     DEFINE_WRAPPERTYPEINFO();
 public:
     virtual ~BeforeInstallPromptEvent();
 
     // For EventModules.cpp
     static PassRefPtrWillBeRawPtr<BeforeInstallPromptEvent> create()
     {
         return adoptRefWillBeNoop(new BeforeInstallPromptEvent());
     }
 
-    static PassRefPtrWillBeRawPtr<BeforeInstallPromptEvent> create(const AtomicString& name, const String& platform)
+    static PassRefPtrWillBeRawPtr<BeforeInstallPromptEvent> create(const AtomicString& name, const Vector<String>& platforms)
     {
-        return adoptRefWillBeNoop(new BeforeInstallPromptEvent(name, platform));
+        return adoptRefWillBeNoop(new BeforeInstallPromptEvent(name, platforms));
     }
 
     static PassRefPtrWillBeRawPtr<BeforeInstallPromptEvent> create(const AtomicString& name, const BeforeInstallPromptEventInit& init)
     {
         return adoptRefWillBeNoop(new BeforeInstallPromptEvent(name, init));
     }
 
-    String platform() const;
+    Vector<String> platforms() const;
     ScriptPromise userChoice(ScriptState*) const;
 
     virtual const AtomicString& interfaceName() const override;
 
 private:
     BeforeInstallPromptEvent();
-    BeforeInstallPromptEvent(const AtomicString& name, const String& platform);
+    BeforeInstallPromptEvent(const AtomicString& name, const Vector<String>& platforms);
     BeforeInstallPromptEvent(const AtomicString& name, const BeforeInstallPromptEventInit&);
 
-    String m_platform;
+    Vector<String> m_platforms;
 };
 
 DEFINE_TYPE_CASTS(BeforeInstallPromptEvent, Event, event, event->interfaceName() == EventNames::BeforeInstallPromptEvent, event.interfaceName() == EventNames::BeforeInstallPromptEvent);
 
 } // namespace blink
 
 #endif // BeforeInstallPromptEvent_h