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

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 04b44eca6fe231e3e98c363f1f4b64339ad4ec8f..5a877acb0aaff5b6f0bd9fd99473ea6fbbe02029 100644
--- a/content/renderer/presentation/presentation_dispatcher.cc
+++ b/content/renderer/presentation/presentation_dispatcher.cc
@@ -8,6 +8,7 @@
 #include "content/public/common/service_registry.h"
 #include "content/public/renderer/render_frame.h"
 #include "third_party/WebKit/public/platform/modules/presentation/WebPresentationController.h"
+#include "third_party/WebKit/public/platform/modules/presentation/WebPresentationSessionCreateCallback.h"
 
 namespace content {
 
@@ -44,6 +45,32 @@ void PresentationDispatcher::updateAvailableChangeWatched(bool watched) {
   }
 }
 
+void PresentationDispatcher::startSession(
+    const blink::WebString& presentationUrl,
+    const blink::WebString& presentationId,
+    blink::WebPresentationSessionCreateCallback* callback) {
+  ConnectToPresentationServiceIfNeeded();
+  presentation_service_->StartSession(
+      presentationUrl.utf8(),
+      presentationId.utf8(),
+      base::Bind(&PresentationDispatcher::OnSessionCreated,
+          base::Unretained(this),
+          base::Unretained(callback)));
+}
+
+void PresentationDispatcher::joinSession(
+    const blink::WebString& presentationUrl,
+    const blink::WebString& presentationId,
+    blink::WebPresentationSessionCreateCallback* callback) {
+  ConnectToPresentationServiceIfNeeded();
+  presentation_service_->JoinSession(
+      presentationUrl.utf8(),
+      presentationId.utf8(),
+      base::Bind(&PresentationDispatcher::OnSessionCreated,
+          base::Unretained(this),
+          base::Unretained(callback)));
+}
+
 void PresentationDispatcher::OnScreenAvailabilityChanged(bool available) {
   if (!controller_)
     return;
@@ -54,6 +81,27 @@ void PresentationDispatcher::OnScreenAvailabilityChanged(bool available) {
   controller_->didChangeAvailability(available);
 }
 
+void PresentationDispatcher::OnSessionCreated(
+    blink::WebPresentationSessionCreateCallback* callback,
+    bool success,
+    mojo::InterfaceRequest<presentation::PresentationSession> session_request,
+    const mojo::String& url,
+    const mojo::String& id,
+    const mojo::String& error) {
+  if (!callback)
+    return;
+  if (!success) {
+    callback->onError(blink::WebString::fromUTF8(error));
+    return;
+  }
+
+  linked_ptr<PresentationSessionDispatcher> session_dispatcher;
+  session_dispatcher.reset(
+      new PresentationSessionDispatcher(session_request.Pass(), url, id));
+  presentation_sessions_.push_back(session_dispatcher);
+  callback->onSuccess(session_dispatcher.get());
+}
+
 void PresentationDispatcher::ConnectToPresentationServiceIfNeeded() {
   if (presentation_service_.get())
     return;