[Presentation API] Plumbing the |defaultpresentationstart| event from Blink to browser/Mojo.

content/renderer/presentation/presentation_dispatcher.cc

Index: content/renderer/presentation/presentation_dispatcher.cc
diff --git a/content/renderer/presentation/presentation_dispatcher.cc b/content/renderer/presentation/presentation_dispatcher.cc
index 88236345a26ab374f4a9fdc7ca6ee917ba8fb7b5..afdea0e3f6aea846999522e60d2ea663ab89f265 100644
--- a/content/renderer/presentation/presentation_dispatcher.cc
+++ b/content/renderer/presentation/presentation_dispatcher.cc
@@ -67,6 +67,18 @@ void PresentationDispatcher::updateAvailableChangeWatched(bool watched) {
   }
 }
 
+void PresentationDispatcher::updateDefaultPresentationStartWatched(
+    bool watched) {
+  ConnectToPresentationServiceIfNeeded();
+  if (watched) {
+    presentation_service_->WaitForDefaultPresentation(
+        base::Bind(&PresentationDispatcher::OnDefaultPresentationStarted,
+                 base::Unretained(this)));

[Peter Beverloo, 2015/03/03 21:40:40]

nit: indentation

[whywhat, 2015/03/05 20:26:14]

Done.

+  } else {
+    presentation_service_->OnDefaultPresentationListenerRemoved();
+  }
+}
+
 void PresentationDispatcher::startSession(
     const blink::WebString& presentationUrl,
     const blink::WebString& presentationId,
@@ -113,6 +125,23 @@ void PresentationDispatcher::OnScreenAvailabilityChanged(bool available) {
   controller_->didChangeAvailability(available);
 }
 
+void PresentationDispatcher::OnDefaultPresentationStarted(
+    presentation::PresentationSessionInfoPtr session_info) {
+  if (!controller_)
+    return;
+
+  // Reset the callback to get the next event.
+  updateDefaultPresentationStartWatched(
+      controller_->isDefaultPresentationStartWatched());
+
+  DCHECK(!session_info.is_null());
+  PresentationSessionDispatcher* session_dispatcher =
+      new PresentationSessionDispatcher(session_info.Pass());
+  presentation_session_dispatchers_.push_back(session_dispatcher);
+  controller_->didStartDefaultPresentation(
+      new PresentationSessionClient(session_dispatcher));
+}
+
 void PresentationDispatcher::OnSessionCreated(
     blink::WebPresentationSessionClientCallbacks* callback,
     presentation::PresentationSessionInfoPtr session_info,