[PresentationAPI] Implementing start/joinSession from WebPresentationClient to PresentationService.

content/renderer/presentation/presentation_dispatcher.h

Index: content/renderer/presentation/presentation_dispatcher.h
diff --git a/content/renderer/presentation/presentation_dispatcher.h b/content/renderer/presentation/presentation_dispatcher.h
index caf1840f2e0b5eab0ae6dfb0b6cbbe6b6e50d779..d0c0c2f4fd790db412d0c545671974acd2957060 100644
--- a/content/renderer/presentation/presentation_dispatcher.h
+++ b/content/renderer/presentation/presentation_dispatcher.h
@@ -6,11 +6,17 @@
 #define CONTENT_RENDERER_PRESENTATION_PRESENTATION_DISPATCHER_H_
 
 #include "base/compiler_specific.h"
+#include "base/memory/scoped_vector.h"
 #include "content/common/content_export.h"
 #include "content/common/presentation/presentation_service.mojom.h"
 #include "content/public/renderer/render_frame_observer.h"
+#include "content/renderer/presentation/presentation_session_dispatcher.h"
 #include "third_party/WebKit/public/platform/modules/presentation/WebPresentationClient.h"
 
+namespace blink {
+class WebString;
+}  // namespace blink
+
 namespace content {
 
 // PresentationDispatcher is a delegate for Presentation API messages used by
@@ -27,14 +33,34 @@ class CONTENT_EXPORT PresentationDispatcher
   virtual void setController(
       blink::WebPresentationController* controller);
   virtual void updateAvailableChangeWatched(bool watched);
+  virtual void startSession(
+      const blink::WebString& presentationUrl,
+      const blink::WebString& presentationId,
+      blink::WebPresentationSessionClientCallbacks* callback);
+  virtual void joinSession(
+      const blink::WebString& presentationUrl,
+      const blink::WebString& presentationId,
+      blink::WebPresentationSessionClientCallbacks* callback);
 
   void OnScreenAvailabilityChanged(bool available);
+  void OnSessionCreated(
+    blink::WebPresentationSessionClientCallbacks* callback,
+    presentation::PresentationSessionInfoPtr session_info,
+    presentation::PresentationErrorPtr error);
 
   void ConnectToPresentationServiceIfNeeded();
 
   // Used as a weak reference. Can be null since lifetime is bound to the frame.
   blink::WebPresentationController* controller_;
   presentation::PresentationServicePtr presentation_service_;
+
+  // Wrappers around the PresentationSessionPtr corresponding to each Javascript
+  // PresentationSession object passed back to the frame.
+  // TODO(avayvod): Switch to base::IDMap when the lookup by presentation id is
+  // needed.
+  using PresentationSessionDispatchers =
+      ScopedVector<PresentationSessionDispatcher>;
+  PresentationSessionDispatchers presentation_session_dispatchers_;
 };
 
 }  // namespace content