[Presentation API] Additional plumbing for PresentationServiceImpl.

content/common/presentation/presentation_service.mojom

Index: content/common/presentation/presentation_service.mojom
diff --git a/content/common/presentation/presentation_service.mojom b/content/common/presentation/presentation_service.mojom
index d1e4b07909b59f888cd7f09433da54fcdb0742c0..6dd29b6390acbd60ace951d14bb2816255c4fb6a 100644
--- a/content/common/presentation/presentation_service.mojom
+++ b/content/common/presentation/presentation_service.mojom
@@ -7,7 +7,6 @@ module presentation;
 import "presentation_session.mojom";
 
 struct PresentationSessionInfo {
-    PresentationSession session;
     string url;
     string id;
 };
@@ -20,11 +19,17 @@ enum PresentationErrorType {
 };
 
 struct PresentationError {
-    PresentationErrorType errorType;
+    PresentationErrorType error_type;
     string message;
 };
 
 interface PresentationService {
+    // Called when the browser parses the specified default presentation URL or
+    // presentation ID.
+    SetDefaultPresentationUrl(
+        string default_presentation_url,
+        string? default_presentation_id);
+
     // Returns the last screen availability state if it’s changed since the last
     // time the method was called. The client has to call this method again when
     // handling the result (provided via Mojo callback) to get the next update
@@ -33,11 +38,12 @@ interface PresentationService {
     // stop discovery once there are no active calls to GetScreenAvailability.
     // |presentation_url| can be specified to help the implementation to filter
     // out incompatible screens.
-    GetScreenAvailability(string? presentation_url) => (bool available);
+    GetScreenAvailability(string? presentation_url) =>
+        (string? presentation_url, bool available);
 
     // Called when the frame no longer listens to the
     // |availablechange| event.
-    OnScreenAvailabilityListenerRemoved();
+    OnScreenAvailabilityListenerRemoved(string? presentation_url);
 
     // Called when startSession() is called by the frame. The result callback
     // will return a non-null and valid PresentationSessionInfo if starting the
@@ -50,7 +56,7 @@ interface PresentationService {
     // rather than get a new one. An empty presentation id means that the
     // UA will generate the presentation id.
     StartSession(string presentation_url, string? presentation_id)
-         => (PresentationSessionInfo? sessionInfo, PresentationError? error);
+        => (PresentationSessionInfo? sessionInfo, PresentationError? error);
 
     // Called when joinSession() is called by the frame. The result callback
     // works the same as for the method above. JoinSession will join a known
@@ -58,4 +64,4 @@ interface PresentationService {
     // silently and without user action.
     JoinSession(string presentation_url, string? presentation_id)
         => (PresentationSessionInfo? sessionInfo, PresentationError? error);
-};
+};