[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 3005609e936722a0eb1051965e1db2446c3e758a..06de9269f3c84fd40936ee83f662ede729826124 100644
--- a/content/public/browser/presentation_service_delegate.h
+++ b/content/public/browser/presentation_service_delegate.h
@@ -26,6 +26,11 @@ class PresentationSessionStateListener;
 using PresentationSessionMessageCallback = base::Callback<
     void(const ScopedVector<content::PresentationSessionMessage>&, bool)>;
 
+using PresentationReceiverSessionAvailableCallback =
+    base::Callback<void(const content::PresentationSessionInfo*)>;
+
+using SendMessageCallback = base::Callback<void(bool)>;
+
 // An interface implemented by embedders to handle presentation API calls
 // forwarded from PresentationServiceImpl.
 class CONTENT_EXPORT PresentationServiceDelegate {
@@ -51,7 +56,6 @@ class CONTENT_EXPORT PresentationServiceDelegate {
       base::Callback<void(const PresentationSessionInfo&)>;
   using PresentationSessionErrorCallback =
       base::Callback<void(const PresentationError&)>;
-  using SendMessageCallback = base::Callback<void(bool)>;
 
   virtual ~PresentationServiceDelegate() {}
 
@@ -179,6 +183,32 @@ class CONTENT_EXPORT PresentationServiceDelegate {
       int render_process_id,
       int render_frame_id,
       content::PresentationSessionStateListener* listener) = 0;
+
+  // Gets a receiver presentation session for the offscreen presentation hosted
+  // on the offscreen tab containing this frame, or waits until one is
+  // available.

[mark a. foltz, 2015/10/12 21:56:10]

Registers a callback to be notified when the offscreen presentation
corresponding to the frame is available.

[miu, 2015/10/14 01:54:57]

I'm not sure "register" is the right verb here, though.  This is a one-time
callback, not a repeat callback.

+  // Runs |callback| once the receiver becomes available.  |callback| will be
+  // run during this method call if the receiver is already available, or at
+  // some later time when a receiver presentation session becomes available.
+  // It is possible that |callback| will never be run if a receiver never
+  // becomes available.
+  // If |render_process_id| and |render_frame_id| do not refer to the main
+  // render frame of this WebContents, |callback| will be immediately invoked
+  // with null.
+  virtual void NotifyWhenReceiverSessionIsAvailable(
+      int render_process_id,
+      int render_frame_id,
+      const PresentationReceiverSessionAvailableCallback& callback) = 0;
+
+  // Gets all receiver presentation sessions for the offscreen presentation
+  // hosted on the offscreen tab containing this frame.

[mark a. foltz, 2015/10/12 21:56:10]

Returns all presentation sessions for the offscreen presentation corresponding
to the given frame (if any).

[imcheng, 2015/10/17 01:00:24]

Done.

+  // Unlike |GetPresentationReceiverSession|, this method immediately returns

[miu, 2015/10/14 01:54:57]

This part of the comment is stale now (GetPresentationReceiverSession was
renamed).  Suggest you just delete it since the new naming makes things clear.

[imcheng, 2015/10/17 01:00:24]

Done.

+  // all receiver sessions that are currently available.
+  // If |render_process_id| and |render_frame_id| do not refer to the main
+  // render frame of this WebContents, an empty vector will be returned.
+  virtual std::vector<content::PresentationSessionInfo>

[miu, 2015/10/14 01:54:57]

style: Per style guide, consider having the caller provide the vector via an
output argument instead:

  virtual bool GetPresentationReceiverSessions(int, int,
      std::vector<PresSessInfo>* sessions);

(Then you can return false if |render_process_id| and |render_frame_id| are bad
references.)

[imcheng, 2015/10/17 01:00:24]

Done.

+  GetPresentationReceiverSessions(int render_process_id,
+                                  int render_frame_id) = 0;
 };
 
 }  // namespace content