PLT-5012 Combine updateLastViewedAt, setLastViewedAt and setActiveChannel into a single API (#4840)

* Combine updateLastViewedAt, setLastViewedAt and setActiveChannel into a single API

* Remove preference DB writes

webapp/actions/channel_actions.jsx

@@ -53,7 +53,7 @@ export function executeCommand(message, args, success, error) {
 
 export function setChannelAsRead(channelIdParam) {
     const channelId = channelIdParam || ChannelStore.getCurrentId();
-    AsyncClient.updateLastViewedAt();
+    AsyncClient.viewChannel();
     ChannelStore.resetCounts(channelId);
     ChannelStore.emitChange();
     if (channelId === ChannelStore.getCurrentId()) {

webapp/actions/global_actions.jsx

@@ -48,7 +48,7 @@ export function emitChannelClickEvent(channel) {
 
         getMyChannelMembersPromise.then(() => {
             AsyncClient.getChannelStats(chan.id, true);
-            AsyncClient.updateLastViewedAt(chan.id);
+            AsyncClient.viewChannel(chan.id, ChannelStore.getCurrentId());
             loadPosts(chan.id);
             trackPage();
         });

webapp/actions/post_actions.jsx

@@ -22,7 +22,7 @@ export function handleNewPost(post, msg) {
 
     if (ChannelStore.getCurrentId() === post.channel_id) {
         if (window.isActive) {
-            AsyncClient.updateLastViewedAt(null, false);
+            AsyncClient.viewChannel();
         } else {
             AsyncClient.getChannel(post.channel_id);
         }

webapp/actions/websocket_actions.jsx

@@ -205,7 +205,7 @@ function handlePostEditEvent(msg) {
     // Update channel state
     if (ChannelStore.getCurrentId() === msg.broadcast.channel_id) {
         if (window.isActive) {
-            AsyncClient.updateLastViewedAt(null, false);
+            AsyncClient.viewChannel();
         }
     }
 }