[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 1f5e928483d0ef8830d372d5499a72d9690f330e..5430e0877f554ba7741e73c63cf5970b4c83f32b 100644
--- a/content/public/browser/presentation_service_delegate.h
+++ b/content/public/browser/presentation_service_delegate.h
@@ -29,6 +29,11 @@ using SessionStateChangedCallback =
 using PresentationSessionMessageCallback = base::Callback<
     void(const ScopedVector<content::PresentationSessionMessage>&, bool)>;
 
+using PresenterSessionAvailableCallback =
+    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 {
@@ -54,7 +59,6 @@ class CONTENT_EXPORT PresentationServiceDelegate {
       base::Callback<void(const PresentationSessionInfo&)>;
   using PresentationSessionErrorCallback =
       base::Callback<void(const PresentationError&)>;
-  using SendMessageCallback = base::Callback<void(bool)>;
 
   virtual ~PresentationServiceDelegate() {}
 
@@ -180,6 +184,16 @@ class CONTENT_EXPORT PresentationServiceDelegate {
       int render_process_id,
       int render_frame_id,
       const SessionStateChangedCallback& state_changed_cb) = 0;
+
+  virtual void GetPresenterSession(
+      int render_process_id,

[miu, 2015/09/17 00:09:20]

BTW--Most of the methods in this interface have these two render_process_id and
render_frame_id arguments.  Is it ever possible to use this API on non-main
render frames?  If not, you may want to clarify by naming the 2nd arg
main_render_frame_id and also DCHECK()ing in the method impls.

[imcheng, 2015/09/26 01:21:57]

It's definitely possible to use it on non main frames. Any frame can invoke the
presentation API.

+      int render_frame_id,
+      const PresenterSessionAvailableCallback& success_callback,
+      const base::Callback<void(const std::string&)>& error_callback) = 0;
+
+  virtual std::vector<content::PresentationSessionInfo> GetPresenterSessions(
+      int render_process_id,
+      int render_frame_id) = 0;
 };
 
 }  // namespace content