Skip waiting for NTP loading unnecessarily

When a new tab is created for loading a non-NTP page, skip waiting
for NTP loading. This decreases the chance of timeout waiting for
NTP loading on slower devices.

Bug: 983170
Change-Id: Ibf73a0664865aba2d10b77d12c4cccfef96ed615
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1911639Reviewed-by: Yue Zhang <yuezhanggg@chromium.org>
Commit-Queue: Wei-Yin Chen (陳威尹) <wychen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714562}

chrome/android/features/tab_ui/javatests/src/org/chromium/chrome/browser/tasks/tab_management/TabUiTestHelper.java

@@ -265,7 +265,7 @@ public class TabUiTestHelper {
             Tab previousTab = previousTabModel.getTabAt(previousTabIndex);
 
             ChromeTabUtils.newTabFromMenu(InstrumentationRegistry.getInstrumentation(),
-                    rule.getActivity(), isIncognito, true);
+                    rule.getActivity(), isIncognito, url == null);
 
             if (url != null) rule.loadUrl(url);