[Presentation API] Added the DefaultPresentationStart event and parsing of the default presentation…

Source/modules/presentation/PresentationController.cpp

Index: Source/modules/presentation/PresentationController.cpp
diff --git a/Source/modules/presentation/PresentationController.cpp b/Source/modules/presentation/PresentationController.cpp
index 3b0c26cc2850685fde0b097d2223cd9fd8df2522..e972d412ec5c078c0c81e137f011af6e387282d9 100644
--- a/Source/modules/presentation/PresentationController.cpp
+++ b/Source/modules/presentation/PresentationController.cpp
@@ -6,6 +6,7 @@
 #include "modules/presentation/PresentationController.h"
 
 #include "core/frame/LocalFrame.h"
+#include "modules/presentation/PresentationSession.h"
 #include "public/platform/modules/presentation/WebPresentationClient.h"
 
 namespace blink {
@@ -74,6 +75,30 @@ void PresentationController::updateAvailableChangeWatched(bool watched)
         m_client->updateAvailableChangeWatched(watched);
 }
 
+void PresentationController::didStartDefaultPresentation(WebPresentationSessionClient* sessionClient)
+{
+    if (!m_presentation) {
+        PresentationSession::dispose(sessionClient);
+        return;
+    }
+
+    PresentationSession* session = PresentationSession::take(sessionClient, m_presentation);
+    m_presentation->didStartDefaultPresentation(session);
+}
+
+bool PresentationController::isDefaultPresentationStartWatched() const
+{
+    if (!m_presentation)
+        return false;
+    return m_presentation->isDefaultPresentationStartWatched();
+}
+
+void PresentationController::updateDefaultPresentationStartWatched(bool watched)
+{
+    if (m_client)
+        m_client->updateDefaultPresentationStartWatched(watched);
+}
+
 void PresentationController::startSession(const String& presentationUrl, const String& presentationId, WebPresentationSessionClientCallbacks* callbacks)
 {
     if (!m_client) {