Fixes redirects to external apps when navigating from PWA.

chrome/android/javatests/src/org/chromium/chrome/browser/webapps/WebappNavigationTest.java

Index: chrome/android/javatests/src/org/chromium/chrome/browser/webapps/WebappNavigationTest.java
diff --git a/chrome/android/javatests/src/org/chromium/chrome/browser/webapps/WebappNavigationTest.java b/chrome/android/javatests/src/org/chromium/chrome/browser/webapps/WebappNavigationTest.java
index e7e96e3981a3be8c16abb453cbc2043f0370ddd9..664cc877a8d9d1d73d0c88924c36cf177d4efcf1 100644
--- a/chrome/android/javatests/src/org/chromium/chrome/browser/webapps/WebappNavigationTest.java
+++ b/chrome/android/javatests/src/org/chromium/chrome/browser/webapps/WebappNavigationTest.java
@@ -24,7 +24,9 @@ import org.chromium.chrome.browser.ChromeSwitches;
 import org.chromium.chrome.browser.ChromeTabbedActivity;
 import org.chromium.chrome.browser.ShortcutHelper;
 import org.chromium.chrome.browser.customtabs.CustomTabActivity;
+import org.chromium.chrome.browser.externalnav.ExternalNavigationHandler.OverrideUrlLoadingResult;
 import org.chromium.chrome.browser.firstrun.FirstRunStatus;
+import org.chromium.chrome.browser.tab.InterceptNavigationDelegateImpl;
 import org.chromium.chrome.test.ChromeJUnit4ClassRunner;
 import org.chromium.chrome.test.util.browser.contextmenu.ContextMenuUtils;
 import org.chromium.content.browser.test.util.DOMUtils;
@@ -37,6 +39,7 @@ import org.chromium.ui.base.PageTransition;
 @RunWith(ChromeJUnit4ClassRunner.class)
 @CommandLineFlags.Add({ChromeSwitches.DISABLE_FIRST_RUN_EXPERIENCE})
 public class WebappNavigationTest {
+    private static final String YOUTUBE_URL = "https://www.youtube.com/watch?v=EYmjoW4vIX8";
     private static final String OFF_ORIGIN_URL = "https://www.google.com/";
     private static final String WEB_APP_PATH = "/chrome/test/data/banners/manifest_test_page.html";
     private static final String IN_SCOPE_PAGE_PATH =
@@ -194,6 +197,45 @@ public class WebappNavigationTest {
         Assert.assertTrue(tabbedChrome.getActivityTab().getUrl().startsWith("https://www.google."));
     }
 
+    @Test
+    @SmallTest
+    @Feature({"Webapps"})
+    public void testRegularLinkToExternalApp() throws Exception {
+        runWebappActivityAndWaitForIdle(mActivityTestRule.createIntent());
+
+        InterceptNavigationDelegateImpl navigationDelegate =
+                mActivityTestRule.getActivity().getActivityTab().getInterceptNavigationDelegate();
+
+        addAnchor("testLink", YOUTUBE_URL, "_self");
+        DOMUtils.clickNode(
+                mActivityTestRule.getActivity().getActivityTab().getContentViewCore(), "testLink");
+
+        activityListener.waitForExternalApp();
+        Assert.assertEquals(OverrideUrlLoadingResult.OVERRIDE_WITH_EXTERNAL_INTENT,
+                navigationDelegate.getLastOverrideUrlLoadingResultForTests());
+    }
+
+    @Test
+    @SmallTest
+    @Feature({"Webapps"})
+    public void testNewTabLinkToExternalApp() throws Exception {
+        runWebappActivityAndWaitForIdle(mActivityTestRule.createIntent());
+
+        addAnchor("testLink", YOUTUBE_URL, "_blank");
+        DOMUtils.clickNode(
+                mActivityTestRule.getActivity().getActivityTab().getContentViewCore(), "testLink");
+
+        // For _blank anchors, we open the CustomTab which does the redirecting if necessary.
+        CustomTabActivity customTab = activityListener.waitFor(CustomTabActivity.class);
+
+        activityListener.waitForExternalApp();
+
+        InterceptNavigationDelegateImpl navigationDelegate =
+                customTab.getActivityTab().getInterceptNavigationDelegate();
+        Assert.assertEquals(OverrideUrlLoadingResult.OVERRIDE_WITH_EXTERNAL_INTENT,
+                navigationDelegate.getLastOverrideUrlLoadingResultForTests());
+    }
+
     private void runWebappActivityAndWaitForIdle(Intent intent) throws Exception {
         mActivityTestRule.startWebappActivity(
                 intent.putExtra(ShortcutHelper.EXTRA_URL, mTestServer.getURL(WEB_APP_PATH)));