[Blink, RemotePlayback] Added the disableRemotePlayback check to prompt().

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 a79e321554cd934336f420935d49d64160b2c75b..063d01b780ae362caac540c498ff23a6f15f231a 100644
--- a/third_party/WebKit/Source/modules/remoteplayback/RemotePlayback.cpp
+++ b/third_party/WebKit/Source/modules/remoteplayback/RemotePlayback.cpp
@@ -5,6 +5,7 @@
 #include "modules/remoteplayback/RemotePlayback.h"
 
 #include "bindings/core/v8/ScriptPromiseResolver.h"
+#include "core/HTMLNames.h"
 #include "core/dom/DOMException.h"
 #include "core/dom/Document.h"
 #include "core/events/Event.h"
@@ -82,11 +83,16 @@ ScriptPromise RemotePlayback::getAvailability(ScriptState* scriptState)
 
 ScriptPromise RemotePlayback::prompt(ScriptState* scriptState)
 {
-    // TODO(avayvod): implement steps 3, 4, 5, 8, 9 of the algorithm.
+    // TODO(avayvod): implement steps 4, 5, 8, 9 of the algorithm.
     // https://crbug.com/647441
     ScriptPromiseResolver* resolver = ScriptPromiseResolver::create(scriptState);
     ScriptPromise promise = resolver->promise();
 
+    if (m_mediaElement->fastHasAttribute(HTMLNames::disableremoteplaybackAttr)) {
+        resolver->reject(DOMException::create(InvalidStateError, "disableRemotePlayback attribute is present."));
+        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 (!UserGestureIndicator::utilizeUserGesture()) {