Convert app banners to use Mojo.

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/Document.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(
     const AtomicString& name,
-    ExecutionContext* executionContext,
-    const Vector<String>& platforms,
-    int requestId,
-    WebAppBannerClient* client)
+    LocalFrame* frame,
+    mojom::blink::AppBannerServicePtr servicePtr,
+    mojom::blink::AppBannerEventRequest eventRequest,
+    const Vector<String>& platforms)
     : Event(name, false, true),
+      m_bannerService(std::move(servicePtr)),
+      m_binding(this, std::move(eventRequest)),
       m_platforms(platforms),
-      m_requestId(requestId),
-      m_client(client),
-      m_userChoice(new UserChoiceProperty(executionContext,
+      m_userChoice(new UserChoiceProperty(frame->document(),
                                           this,
                                           UserChoiceProperty::UserChoice)),
-      m_registered(false) {
-  UseCounter::count(executionContext, UseCounter::BeforeInstallPromptEvent);
+      m_promptCalled(false) {
+  DCHECK(m_bannerService);
+  DCHECK(m_binding.is_bound());
+  UseCounter::count(frame, UseCounter::BeforeInstallPromptEvent);
 }
 
 BeforeInstallPromptEvent::BeforeInstallPromptEvent(
     const AtomicString& name,
     const BeforeInstallPromptEventInit& init)
-    : Event(name, false, true), m_requestId(-1), m_client(nullptr) {
+    : Event(name, false, true), m_binding(this), m_promptCalled(false) {
   if (init.hasPlatforms())
     m_platforms = init.platforms();
 }
 
 BeforeInstallPromptEvent::~BeforeInstallPromptEvent() {}
 
+void BeforeInstallPromptEvent::dispose() {
+  m_bannerService.reset();
+  m_binding.Close();
+}
+
 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()));
-    }
+  // |m_binding| must be bound to allow the AppBannerService to resolve the
+  // userChoice promise.
+  if (m_userChoice && m_binding.is_bound())
     return m_userChoice->promise(scriptState->world());
-  }
   return ScriptPromise::rejectWithDOMException(
       scriptState,
       DOMException::create(InvalidStateError,
                            "userChoice cannot be accessed on this event."));
 }
 
 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)
+  // |m_bannerService| must be bound to allow us to inform the AppBannerService
+  // to display the banner now.
+  if (!defaultPrevented() || m_promptCalled || !m_bannerService.is_bound()) {
     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);
+  UseCounter::count(scriptState->getExecutionContext(),
+                    UseCounter::BeforeInstallPromptEventPrompt);
+
+  m_promptCalled = true;
+  m_bannerService->DisplayAppBanner();
   return ScriptPromise::castUndefined(scriptState);
 }
 
 const AtomicString& BeforeInstallPromptEvent::interfaceName() const {
   return EventNames::BeforeInstallPromptEvent;
 }
 
 void BeforeInstallPromptEvent::preventDefault() {
   Event::preventDefault();
-  UseCounter::count(target()->getExecutionContext(),
-                    UseCounter::BeforeInstallPromptEventPreventDefault);
+  if (target()) {

[dcheng, 2016/10/19 06:15:58]

How come we didn't need this null check before?

[dominickn, 2016/10/19 08:17:00]

We did need it before: crbug.com/655902 :)

Calling var e = new BeforeInstallPromptEvent({}); e.preventDefault() crashed the
renderer because the event had no target. The null check ensures we don't try to
UseCounter in that case, and there's a regression test added.

+    UseCounter::count(target()->getExecutionContext(),
+                      UseCounter::BeforeInstallPromptEventPreventDefault);
+  }
+}
+
+void BeforeInstallPromptEvent::BannerAccepted(const String& platform) {
+  m_userChoice->resolve(AppBannerPromptResult::create(
+      platform, AppBannerPromptResult::Outcome::Accepted));
+}
+
+void BeforeInstallPromptEvent::BannerDismissed() {
+  m_userChoice->resolve(AppBannerPromptResult::create(
+      "", AppBannerPromptResult::Outcome::Dismissed));

[dcheng, 2016/10/19 06:15:58]

Nit: emptyAtom instead of ""

[dominickn, 2016/10/19 08:17:00]

Done.

 }
 
 DEFINE_TRACE(BeforeInstallPromptEvent) {
   visitor->trace(m_userChoice);
   Event::trace(visitor);
 }
 
 }  // namespace blink