DevTools: stop whats new from opening on fresh profile

BUG=713901

Review-Url: https://codereview.chromium.org/2935393002
Cr-Commit-Position: refs/heads/master@{#480268}

third_party/WebKit/LayoutTests/inspector/help/release-note-expected.txt

 Test release note
 
 Last release note version seen:
-0
+1
 
 Dumping release note text:
 Highlights from Chrome 100 update

third_party/WebKit/LayoutTests/inspector/help/release-note-unit-expected.txt

@@ -13,3 +13,8 @@ Running: alreadySeenReleaseNote
 Last seen version: 5
 Did not show release note drawer
 
+Running: doNotShowReleaseNoteOnFreshProfile
+Last seen version: 0
+Did not show release note drawer
+Release note version in setting: 5
+

third_party/WebKit/LayoutTests/inspector/help/release-note-unit.html

@@ -42,6 +42,12 @@ function test()
             testMaybeShowInDrawer(lastSeenVersion);
             next();
         },
+        function doNotShowReleaseNoteOnFreshProfile(next) {
+            var lastSeenVersion = 0;
+            testMaybeShowInDrawer(lastSeenVersion);
+            InspectorTest.addResult(`Release note version in setting: ${Help.releaseNoteVersionSetting().get()}`);
+            next();
+        },
     ]);
 }
 </script>

third_party/WebKit/LayoutTests/inspector/help/release-note.html

@@ -26,6 +26,7 @@ function test() {
     InspectorTest.addSniffer(UI.viewManager, "showView", onShowView);
 
     InspectorTest.addResult("Last release note version seen:");
+    Help.releaseNoteVersionSetting().set(1);
     InspectorTest.addResult(Help.releaseNoteVersionSetting().get() + "\n");
     Help.showReleaseNoteIfNeeded();
 

third_party/WebKit/Source/devtools/front_end/help/Help.js

@@ -33,6 +33,10 @@ Help.showReleaseNoteIfNeeded = function() {
  * @param {number} latestVersion
  */
 Help._showReleaseNoteIfNeeded = function(lastSeenVersion, latestVersion) {
+  if (!lastSeenVersion) {
+    Help.releaseNoteVersionSetting().set(latestVersion);
+    return;
+  }
   if (lastSeenVersion >= latestVersion)
     return;
   Help.releaseNoteVersionSetting().set(latestVersion);