[Bugfix] Couldn't enter locked-fullscreen while in tablet mode

Locked fullscreen mode wasn't working for devices that were in tablet mode.

Needed to put SetLockedFullscreenState below window()->Show() as that one
was resetting the locked-fullscreen mode.

Bug: chromium:857125
Change-Id: Ic36e2dc0f4f76e05bf713b1f2dcc384d1ead308e
Reviewed-on: https://chromium-review.googlesource.com/1120526
Commit-Queue: Ivan Šandrk <isandrk@chromium.org>
Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#572226}

chrome/browser/extensions/api/tabs/tabs_api.cc

@@ -645,20 +645,21 @@ ExtensionFunction::ResponseAction WindowsCreateFunction::Run() {
   }
   chrome::SelectNumberedTab(new_window, 0);
 
+  if (focused)
+    new_window->window()->Show();
+  else
+    new_window->window()->ShowInactive();
+
 #if defined(OS_CHROMEOS)
   // Lock the window fullscreen only after the new tab has been created
-  // (otherwise the tabstrip is empty).
+  // (otherwise the tabstrip is empty), and window()->show() has been called
+  // (otherwise that resets the locked mode for devices in tablet mode).
   if (create_data &&
       create_data->state == windows::WINDOW_STATE_LOCKED_FULLSCREEN) {
     SetLockedFullscreenState(new_window, true);
   }
 #endif
 
-  if (focused)
-    new_window->window()->Show();
-  else
-    new_window->window()->ShowInactive();
-
   std::unique_ptr<base::Value> result;
   if (new_window->profile()->IsOffTheRecord() &&
       !browser_context()->IsOffTheRecord() &&