Add UseCounters for BeforeInstallPromptEvent.

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

Index: third_party/WebKit/Source/modules/app_banner/BeforeInstallPromptEvent.cpp
diff --git a/third_party/WebKit/Source/modules/app_banner/BeforeInstallPromptEvent.cpp b/third_party/WebKit/Source/modules/app_banner/BeforeInstallPromptEvent.cpp
index c1c839b4b738c4945c24f876de8c26bef9b937af..f8b979b1bb44b9c153093907a73f0480b765f34a 100644
--- a/third_party/WebKit/Source/modules/app_banner/BeforeInstallPromptEvent.cpp
+++ b/third_party/WebKit/Source/modules/app_banner/BeforeInstallPromptEvent.cpp
@@ -7,6 +7,7 @@
 #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"
@@ -25,6 +26,7 @@ BeforeInstallPromptEvent::BeforeInstallPromptEvent(const AtomicString& name, Exe
     , m_userChoice(new UserChoiceProperty(executionContext, this, UserChoiceProperty::UserChoice))
     , m_registered(false)
 {
+    UseCounter::count(executionContext, UseCounter::BeforeInstallPromptEvent);
 }
 
 BeforeInstallPromptEvent::BeforeInstallPromptEvent(const AtomicString& name, const BeforeInstallPromptEventInit& init)
@@ -47,6 +49,7 @@ Vector<String> BeforeInstallPromptEvent::platforms() const
 
 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;
@@ -57,13 +60,10 @@ ScriptPromise BeforeInstallPromptEvent::userChoice(ScriptState* scriptState)
     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.
@@ -76,6 +76,17 @@ ScriptPromise BeforeInstallPromptEvent::prompt(ScriptState* scriptState)
     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);