Don't expose webshare from the browser when the origin trial disables it.

third_party/WebKit/Source/modules/webshare/NavigatorShare.cpp

 // 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 "modules/webshare/NavigatorShare.h"
 
 #include "core/dom/DOMException.h"
 #include "core/dom/Document.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/Navigator.h"
 #include "modules/webshare/ShareData.h"
 #include "platform/UserGestureIndicator.h"
 #include "platform/mojo/MojoHelper.h"
 #include "public/platform/InterfaceProvider.h"
 #include "public/platform/Platform.h"
 
 namespace blink {
 
 class NavigatorShare::ShareClientImpl final
     : public GarbageCollected<ShareClientImpl> {
  public:
   ShareClientImpl(NavigatorShare*, ScriptPromiseResolver*);
 
   void callback(const String& error);
 
+  void onConnectionError();
+
   DEFINE_INLINE_TRACE() {
     visitor->trace(m_navigator);
     visitor->trace(m_resolver);
   }
 
  private:
   WeakMember<NavigatorShare> m_navigator;
   Member<ScriptPromiseResolver> m_resolver;
 };
 
 NavigatorShare::ShareClientImpl::ShareClientImpl(
     NavigatorShare* navigator_share,
     ScriptPromiseResolver* resolver)
     : m_navigator(navigator_share), m_resolver(resolver) {}
 
 void NavigatorShare::ShareClientImpl::callback(const String& error) {
   if (m_navigator)
     m_navigator->m_clients.remove(this);
 
   if (error.isNull()) {
     m_resolver->resolve();
   } else {
     // TODO(mgiuca): Work out which error type to use.
     m_resolver->reject(DOMException::create(AbortError, error));
   }
 }
 
+void NavigatorShare::ShareClientImpl::onConnectionError() {
+  m_resolver->reject(
+      DOMException::create(SecurityError, "WebShare is disabled."));
+}
+
 NavigatorShare::~NavigatorShare() = default;
 
 NavigatorShare& NavigatorShare::from(Navigator& navigator) {
   NavigatorShare* supplement = static_cast<NavigatorShare*>(
       Supplement<Navigator>::from(navigator, supplementName()));
   if (!supplement) {
     supplement = new NavigatorShare();
     provideTo(navigator, supplementName(), supplement);
   }
   return *supplement;
@@ skipping 23 matching lines @@
         "Must be handling a user gesture to perform a share request.");
     return ScriptPromise::rejectWithDOMException(scriptState, error);
   }
 
   Document* doc = toDocument(scriptState->getExecutionContext());
   DCHECK(doc);
   if (!m_service) {
     LocalFrame* frame = doc->frame();
     DCHECK(frame);
     frame->interfaceProvider()->getInterface(mojo::GetProxy(&m_service));
+    m_service.set_connection_error_handler(convertToBaseCallback(WTF::bind(
+        &NavigatorShare::onConnectionError, wrapWeakPersistent(this))));
     DCHECK(m_service);
   }
 
   ScriptPromiseResolver* resolver = ScriptPromiseResolver::create(scriptState);
   ShareClientImpl* client = new ShareClientImpl(this, resolver);
   m_clients.add(client);
   ScriptPromise promise = resolver->promise();
 
   m_service->Share(shareData.hasTitle() ? shareData.title() : emptyString(),
                    shareData.hasText() ? shareData.text() : emptyString(),
                    doc->completeURL(shareData.url()),
                    convertToBaseCallback(WTF::bind(&ShareClientImpl::callback,
                                                    wrapPersistent(client))));
 
   return promise;
 }
 
 ScriptPromise NavigatorShare::share(ScriptState* scriptState,
                                     Navigator& navigator,
                                     const ShareData& shareData) {
   return from(navigator).share(scriptState, shareData);
 }
 
+void NavigatorShare::onConnectionError() {
+  for (auto& client : m_clients) {
+    client->onConnectionError();
+  }
+  m_clients.clear();
+  m_service.reset();
+}
+
 }  // namespace blink