[Presentation API] Resolve PresentationRequest::reconnect() with existing presentation connection i…

third_party/WebKit/Source/modules/presentation/PresentationController.h

Index: third_party/WebKit/Source/modules/presentation/PresentationController.h
diff --git a/third_party/WebKit/Source/modules/presentation/PresentationController.h b/third_party/WebKit/Source/modules/presentation/PresentationController.h
index 9aecc0f4c95e7ca5fe0ae9f76640a15f451eaddf..ae60e27488a87765aae3ea8b5b0dc04f40383054 100644
--- a/third_party/WebKit/Source/modules/presentation/PresentationController.h
+++ b/third_party/WebKit/Source/modules/presentation/PresentationController.h
@@ -73,6 +73,13 @@ class MODULES_EXPORT PresentationController final
   // Handling of running connections.
   void registerConnection(PresentationConnection*);
 
+  // Return a connection in |m_connections| with id equals to |presentationId|,
+  // url equals to one of |presentationUrls|, and state is not terminated.
+  // Return null if such a connection does not exist.
+  PresentationConnection* findExistingConnection(
+      const blink::WebVector<blink::WebURL>& presentationUrls,
+      const blink::WebString& presentationId);
+
  private:
   PresentationController(LocalFrame&, WebPresentationClient*);