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

content/browser/presentation/presentation_service_impl.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/presentation/presentation_service_impl.h"
 
 #include "base/logging.h"
 #include "content/public/browser/content_browser_client.h"
 #include "content/public/browser/navigation_details.h"
 #include "content/public/browser/render_frame_host.h"
@@ skipping 81 matching lines @@
         std::make_pair(presentation_url_str, context)).first;
   }
 
   it->second->CallbackReceived(callback);
 }
 
 void PresentationServiceImpl::OnScreenAvailabilityListenerRemoved() {
   NOTIMPLEMENTED();
 }
 
+void PresentationServiceImpl::StartSession(
+    const mojo::String& presentation_url,
+    const mojo::String& presentation_id,
+    const NewSessionMojoCallback& callback) {
+  NOTIMPLEMENTED();
+}
+
+void PresentationServiceImpl::JoinSession(
+    const mojo::String& presentation_url,
+    const mojo::String& presentation_id,
+    const NewSessionMojoCallback& callback) {
+  NOTIMPLEMENTED();
+}
+
 void PresentationServiceImpl::DidNavigateAnyFrame(
     content::RenderFrameHost* render_frame_host,
     const content::LoadCommittedDetails& details,
     const content::FrameNavigateParams& params) {
   VLOG(2) << "PresentationServiceImpl::DidNavigateAnyFrame";
   if (render_frame_host_ != render_frame_host)
     return;
 
   std::string prev_url_host = details.previous_url.host();
   std::string curr_url_host = params.url.host();
@@ skipping 83 matching lines @@
   } else {
     // Invoke callback and erase it.
     // There shouldn't be any result stored in this scenario.
     DCHECK(!available_ptr_);
     callback_ptr_->Run(available);
     Reset();
   }
 }
 
 }  // namespace content