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

public/platform/modules/presentation/WebPresentationClient.h

Index: public/platform/modules/presentation/WebPresentationClient.h
diff --git a/public/platform/modules/presentation/WebPresentationClient.h b/public/platform/modules/presentation/WebPresentationClient.h
index f11b22ff5204ab0f86ee172e6226831e079fc184..89cfa4331d52f0323ca2998d4334a8532989504e 100644
--- a/public/platform/modules/presentation/WebPresentationClient.h
+++ b/public/platform/modules/presentation/WebPresentationClient.h
@@ -6,6 +6,7 @@
 #define WebPresentationClient_h
 
 #include "public/platform/WebCallbacks.h"
+#include "public/platform/WebCommon.h"
 
 namespace blink {
 
@@ -31,6 +32,10 @@ public:
     // last event listener from the |availablechange| event.
     virtual void updateAvailableChangeWatched(bool watched) = 0;
 
+    // Called when the frame attaches the first event listener to or removes the
+    // last event listener from the |defaultpresentationstart| event.
+    virtual void updateDefaultPresentationStartWatched(bool watched) { BLINK_ASSERT_NOT_REACHED(); }

[Peter Beverloo, 2015/03/03 21:19:25]

nit: add a FIXME to change this to be pure virtual?

[whywhat, 2015/03/05 18:41:47]

Done.

+
     // Called when the frame request to start a new session.
     // The ownership of the |callbacks| argument is transferred to the embedder.
     virtual void startSession(const WebString& presentationUrl, const WebString& presentationId, WebPresentationSessionClientCallbacks*) = 0;