[RemotePlayback] Keep track of source compatibility and reject prompt() correspondingly

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 86c69e2d965117b42174b68a91101bc8e12f2349..0ddd46f8b2904f4c58e29ea791b969d5dc2489dc 100644
--- a/third_party/WebKit/Source/modules/remoteplayback/RemotePlayback.cpp
+++ b/third_party/WebKit/Source/modules/remoteplayback/RemotePlayback.cpp
@@ -45,10 +45,7 @@ RemotePlayback* RemotePlayback::create(ScriptState* scriptState,
   DCHECK(element.document().frame());
   DCHECK(scriptState);
 
-  RemotePlayback* remotePlayback = new RemotePlayback(scriptState, element);
-  element.setRemotePlaybackClient(remotePlayback);
-
-  return remotePlayback;
+  return new RemotePlayback(scriptState, element);
 }
 
 RemotePlayback::RemotePlayback(ScriptState* scriptState,
@@ -58,7 +55,8 @@ RemotePlayback::RemotePlayback(ScriptState* scriptState,
       m_state(element.isPlayingRemotely()
                   ? WebRemotePlaybackState::Connected
                   : WebRemotePlaybackState::Disconnected),
-      m_availability(element.hasRemoteRoutes()),
+      m_routeAvailable(false),
+      m_sourceCompatible(false),
       m_mediaElement(&element) {}
 
 const AtomicString& RemotePlayback::interfaceName() const {
@@ -175,6 +173,21 @@ ScriptPromise RemotePlayback::prompt() {
     return promise;
   }
 
+  // TODO(avayvod): don't do this check on low-end devices - merge with
+  // https://codereview.chromium.org/2475293003
+  if (!m_routeAvailable) {
+    resolver->reject(DOMException::create(NotFoundError,
+                                          "No remote playback devices found."));
+    return promise;
+  }
+
+  if (!m_sourceCompatible) {
+    resolver->reject(DOMException::create(
+        NotSupportedError,
+        "The currentSrc is not compatible with remote playback"));
+    return promise;
+  }
+
   if (m_state == WebRemotePlaybackState::Disconnected) {
     m_promptPromiseResolver = resolver;
     m_mediaElement->requestRemotePlayback();
@@ -201,7 +214,7 @@ void RemotePlayback::notifyInitialAvailability(int callbackId) {
   if (iter == m_availabilityCallbacks.end())
     return;
 
-  iter->value->call(this, m_availability);
+  iter->value->call(this, m_routeAvailable && m_sourceCompatible);
 }
 
 void RemotePlayback::stateChanged(WebRemotePlaybackState state) {
@@ -241,13 +254,23 @@ void RemotePlayback::stateChanged(WebRemotePlaybackState state) {
   }
 }
 
-void RemotePlayback::availabilityChanged(bool available) {
-  if (m_availability == available)
+void RemotePlayback::availabilityChanged(bool isRouteAvailable,
+                                         bool isSourceCompatible) {
+  if (m_routeAvailable == isRouteAvailable &&
+      m_sourceCompatible == isSourceCompatible) {
+    return;
+  }
+
+  bool oldAvailability = m_routeAvailable && m_sourceCompatible;
+  m_routeAvailable = isRouteAvailable;
+  m_sourceCompatible = isSourceCompatible;
+
+  bool newAvailability = isRouteAvailable && isSourceCompatible;
+  if (newAvailability == oldAvailability)
     return;
 
-  m_availability = available;
   for (auto& callback : m_availabilityCallbacks.values())
-    callback->call(this, m_availability);
+    callback->call(this, newAvailability);
 }
 
 void RemotePlayback::promptCancelled() {
@@ -259,6 +282,10 @@ void RemotePlayback::promptCancelled() {
   m_promptPromiseResolver = nullptr;
 }
 
+bool RemotePlayback::remotePlaybackAvailable() const {
+  return m_routeAvailable && m_sourceCompatible;
+}
+
 void RemotePlayback::remotePlaybackDisabled() {
   if (m_promptPromiseResolver) {
     m_promptPromiseResolver->reject(DOMException::create(