[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..88236345a26ab374f4a9fdc7ca6ee917ba8fb7b5 100644
--- a/content/renderer/presentation/presentation_dispatcher.cc
+++ b/content/renderer/presentation/presentation_dispatcher.cc
@@ -4,10 +4,33 @@
 
 #include "content/renderer/presentation/presentation_dispatcher.h"
 
+#include "base/logging.h"
 #include "content/common/presentation/presentation_service.mojom.h"
 #include "content/public/common/service_registry.h"
 #include "content/public/renderer/render_frame.h"
+#include "content/renderer/presentation/presentation_session_client.h"
+#include "third_party/WebKit/public/platform/WebString.h"
 #include "third_party/WebKit/public/platform/modules/presentation/WebPresentationController.h"
+#include "third_party/WebKit/public/platform/modules/presentation/WebPresentationError.h"
+
+namespace {
+
+blink::WebPresentationError::ErrorType GetWebPresentationErrorTypeFromMojo(
+    presentation::PresentationErrorType mojoErrorType) {
+  switch (mojoErrorType) {
+    case presentation::PRESENTATION_ERROR_TYPE_NO_AVAILABLE_SCREENS:
+      return blink::WebPresentationError::ErrorTypeNoAvailableScreens;
+    case presentation::PRESENTATION_ERROR_TYPE_SESSION_REQUEST_CANCELLED:
+      return blink::WebPresentationError::ErrorTypeSessionRequestCancelled;
+    case presentation::PRESENTATION_ERROR_TYPE_NO_PRESENTATION_FOUND:
+      return blink::WebPresentationError::ErrorTypeNoPresentationFound;
+    case presentation::PRESENTATION_ERROR_TYPE_UNKNOWN:
+    default:
+      return blink::WebPresentationError::ErrorTypeUnknown;
+  }
+}
+
+}  // namespace
 
 namespace content {
 
@@ -44,6 +67,42 @@ void PresentationDispatcher::updateAvailableChangeWatched(bool watched) {
   }
 }
 
+void PresentationDispatcher::startSession(
+    const blink::WebString& presentationUrl,
+    const blink::WebString& presentationId,
+    blink::WebPresentationSessionClientCallbacks* callback) {
+  DCHECK(callback);
+  ConnectToPresentationServiceIfNeeded();
+
+  // The dispatcher owns the service so |this| will be valid when
+  // OnSessionCreated() is called. |callback| needs to be alive and also needs
+  // to be destroyed so we transfer its ownership to the mojo callback.
+  presentation_service_->StartSession(
+      presentationUrl.utf8(),
+      presentationId.utf8(),
+      base::Bind(&PresentationDispatcher::OnSessionCreated,
+          base::Unretained(this),
+          base::Owned(callback)));
+}
+
+void PresentationDispatcher::joinSession(
+    const blink::WebString& presentationUrl,
+    const blink::WebString& presentationId,
+    blink::WebPresentationSessionClientCallbacks* callback) {
+  DCHECK(callback);
+  ConnectToPresentationServiceIfNeeded();
+
+  // The dispatcher owns the service so |this| will be valid when
+  // OnSessionCreated() is called. |callback| needs to be alive and also needs
+  // to be destroyed so we transfer its ownership to the mojo callback.
+  presentation_service_->JoinSession(
+      presentationUrl.utf8(),
+      presentationId.utf8(),
+      base::Bind(&PresentationDispatcher::OnSessionCreated,
+          base::Unretained(this),
+          base::Owned(callback)));
+}
+
 void PresentationDispatcher::OnScreenAvailabilityChanged(bool available) {
   if (!controller_)
     return;
@@ -54,6 +113,26 @@ void PresentationDispatcher::OnScreenAvailabilityChanged(bool available) {
   controller_->didChangeAvailability(available);
 }
 
+void PresentationDispatcher::OnSessionCreated(
+    blink::WebPresentationSessionClientCallbacks* callback,
+    presentation::PresentationSessionInfoPtr session_info,
+    presentation::PresentationErrorPtr error) {
+  DCHECK(callback);
+  if (!error.is_null()) {
+    DCHECK(session_info.is_null());
+    callback->onError(new blink::WebPresentationError(
+        GetWebPresentationErrorTypeFromMojo(error->errorType),
+        blink::WebString::fromUTF8(error->message)));
+    return;
+  }
+
+  DCHECK(!session_info.is_null());
+  PresentationSessionDispatcher* session_dispatcher =
+      new PresentationSessionDispatcher(session_info.Pass());
+  presentation_session_dispatchers_.push_back(session_dispatcher);
+  callback->onSuccess(new PresentationSessionClient(session_dispatcher));
+}
+
 void PresentationDispatcher::ConnectToPresentationServiceIfNeeded() {
   if (presentation_service_.get())
     return;