[Presentation API] 1-UA: notify receiver page when receiver connection becomes available (blink sid…

third_party/WebKit/Source/modules/presentation/Presentation.cpp

Index: third_party/WebKit/Source/modules/presentation/Presentation.cpp
diff --git a/third_party/WebKit/Source/modules/presentation/Presentation.cpp b/third_party/WebKit/Source/modules/presentation/Presentation.cpp
index d20a52919ae54a9f4886c00058428d9b6c77c0a1..950e9f74d2cfadabe61c42eaafae1a0ff094ffec 100644
--- a/third_party/WebKit/Source/modules/presentation/Presentation.cpp
+++ b/third_party/WebKit/Source/modules/presentation/Presentation.cpp
@@ -56,11 +56,13 @@ void Presentation::setDefaultRequest(PresentationRequest* request)
 
 PresentationReceiver* Presentation::receiver()
 {
-    // TODO(mlamouri): only return something if the Blink instance is running in
+    PresentationController* controller = PresentationController::from(*frame());
+    auto* client = controller ? controller->client() : nullptr;
+    // TODO(crbug.com/647296): only return something if the Blink instance is running in
     // presentation receiver mode. The flag PresentationReceiver could be used
     // for that.
     if (!m_receiver)
-        m_receiver = new PresentationReceiver(frame());
+        m_receiver = new PresentationReceiver(frame(), client);
     return m_receiver;
 }