[Blink, RemotePlayback] Reject the prompt() with OperationError if there's a pending promise for th…

third_party/WebKit/Source/modules/remoteplayback/RemotePlayback.cpp

Index: third_party/WebKit/Source/modules/remoteplayback/RemotePlayback.cpp
diff --git a/third_party/WebKit/Source/modules/remoteplayback/RemotePlayback.cpp b/third_party/WebKit/Source/modules/remoteplayback/RemotePlayback.cpp
index 063d01b780ae362caac540c498ff23a6f15f231a..14ffac95c1cb9e8a5262c6c3bd1440ce529e2752 100644
--- a/third_party/WebKit/Source/modules/remoteplayback/RemotePlayback.cpp
+++ b/third_party/WebKit/Source/modules/remoteplayback/RemotePlayback.cpp
@@ -93,15 +93,18 @@ ScriptPromise RemotePlayback::prompt(ScriptState* scriptState)
         return promise;
     }
 
-    // TODO(avayvod): should we have a separate flag to disable the user gesture
-    // requirement (for tests) or reuse the one for the PresentationRequest::start()?
+    if (m_promptPromiseResolver)  {
+        resolver->reject(DOMException::create(OperationError, "A prompt is already being shown for this media element."));
+        return promise;
+    }
+
     if (!UserGestureIndicator::utilizeUserGesture()) {
         resolver->reject(DOMException::create(InvalidAccessError, "RemotePlayback::prompt() requires user gesture."));
         return promise;
     }
 
     if (m_state == WebRemotePlaybackState::Disconnected) {
-        m_promptPromiseResolvers.append(resolver);
+        m_promptPromiseResolver = resolver;
         m_mediaElement->requestRemotePlayback();
     } else {
         m_mediaElement->requestRemotePlaybackControl();
@@ -124,7 +127,7 @@ bool RemotePlayback::hasPendingActivity() const
 {
     return hasEventListeners()
         || !m_availabilityObjects.isEmpty()
-        || !m_promptPromiseResolvers.isEmpty();
+        || m_promptPromiseResolver;
 }
 
 void RemotePlayback::stateChanged(WebRemotePlaybackState state)
@@ -134,14 +137,13 @@ void RemotePlayback::stateChanged(WebRemotePlaybackState state)
     // before checking if anything changed.
     // TODO(avayvod): cleanup this logic when we implementing the "connecting"
     // state.
-    if (state != WebRemotePlaybackState::Disconnected) {
-        for (auto& resolver : m_promptPromiseResolvers)
-            resolver->resolve();
-    } else {
-        for (auto& resolver : m_promptPromiseResolvers)
-            resolver->reject(DOMException::create(AbortError, "Failed to connect to the remote device."));
+    if (m_promptPromiseResolver) {
+        if (state != WebRemotePlaybackState::Disconnected)
+            m_promptPromiseResolver->resolve();
+        else
+            m_promptPromiseResolver->reject(DOMException::create(AbortError, "Failed to connect to the remote device."));
+        m_promptPromiseResolver = nullptr;
     }
-    m_promptPromiseResolvers.clear();
 
     if (m_state == state)
         return;
@@ -162,15 +164,17 @@ void RemotePlayback::availabilityChanged(bool available)
 
 void RemotePlayback::promptCancelled()
 {
-    for (auto& resolver : m_promptPromiseResolvers)
-        resolver->resolve();
-    m_promptPromiseResolvers.clear();
+    if (!m_promptPromiseResolver)
+        return;
+
+    m_promptPromiseResolver->resolve();
+    m_promptPromiseResolver = nullptr;
 }
 
 DEFINE_TRACE(RemotePlayback)
 {
     visitor->trace(m_availabilityObjects);
-    visitor->trace(m_promptPromiseResolvers);
+    visitor->trace(m_promptPromiseResolver);
     visitor->trace(m_mediaElement);
     EventTargetWithInlineData::trace(visitor);
 }