[Presentation API] 1-UA presentation support + presenter APIs.

content/public/browser/presentation_service_delegate.h

Index: content/public/browser/presentation_service_delegate.h
diff --git a/content/public/browser/presentation_service_delegate.h b/content/public/browser/presentation_service_delegate.h
index cb1725bf763ddac7e11cd82822f1f73e194c9be0..5e6da97f4961a15b34b22e873db4c8022a9dbaa6 100644
--- a/content/public/browser/presentation_service_delegate.h
+++ b/content/public/browser/presentation_service_delegate.h
@@ -23,6 +23,7 @@ using PresentationSessionStartedCallback =
     base::Callback<void(const PresentationSessionInfo&)>;
 using PresentationSessionErrorCallback =
     base::Callback<void(const PresentationError&)>;
+using SendMessageCallback = base::Callback<void(bool)>;
 
 // Param #0: a vector of messages that are received.
 // Param #1: tells the callback handler that it may reuse strings or buffers
@@ -61,8 +62,6 @@ class CONTENT_EXPORT PresentationServiceDelegate {
     virtual ~Observer() {}
   };
 
-  using SendMessageCallback = base::Callback<void(bool)>;
-
   virtual ~PresentationServiceDelegate() {}
 
   // Registers an observer associated with frame with |render_process_id|
@@ -200,6 +199,15 @@ class CONTENT_EXPORT PresentationServiceDelegate {
       int render_frame_id,
       const PresentationSessionInfo& connection,
       const PresentationConnectionStateChangedCallback& state_changed_cb) = 0;
+
+  // Returns the current list of receiver connections for the offscreen
+  // presentation hosted on the offscreen tab containing this frame.
+  // In additions, registers |callback| to be run when a new receiver connection
+  // is available.
+  virtual std::vector<content::PresentationSessionInfo> GetReceiverConnections(
+      int render_process_id,
+      int render_frame_id,
+      const PresentationSessionStartedCallback& callback) = 0;
 };
 
 }  // namespace content