Re-submit of AppLink implementation.

chrome/android/java/src/org/chromium/chrome/browser/externalnav/ExternalNavigationHandler.java

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.chrome.browser.externalnav;
 
 import android.content.ActivityNotFoundException;
 import android.content.ComponentName;
 import android.content.Intent;
 import android.content.pm.ResolveInfo;
@@ skipping 317 matching lines @@
         // as the app.  This will make sure the link is opened in the same tab
         // instead of making a new one.
         intent.putExtra(Browser.EXTRA_APPLICATION_ID, mDelegate.getPackageName());
         if (params.isOpenInNewTab()) intent.putExtra(Browser.EXTRA_CREATE_NEW_TAB, true);
         intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
 
         if (params.getReferrerUrl() != null) {
             IntentHandler.setPendingReferrer(intent, params.getReferrerUrl());
         }
 
+        if (!params.isIncognito() && mDelegate.maybeDelegateToAppLink(intent)) {
+            return OverrideUrlLoadingResult.OVERRIDE_WITH_EXTERNAL_INTENT;
+        }
+
         // Make sure webkit can handle it internally before checking for specialized
         // handlers. If webkit can't handle it internally, we need to call
         // startActivityIfNeeded or startActivity.
         if (!isExternalProtocol) {
             if (!mDelegate.isSpecializedHandlerAvailable(resolvingInfos)) {
                 return OverrideUrlLoadingResult.NO_OVERRIDE;
             } else if (params.getReferrerUrl() != null && (isLink || isFormSubmit)) {
                 // Current URL has at least one specialized handler available. For navigations
                 // within the same host, keep the navigation inside the browser unless the set of
                 // available apps to handle the new navigation is different. http://crbug.com/463138
@@ skipping 28 matching lines @@
 
         try {
             if (params.isIncognito() && !mDelegate.willChromeHandleIntent(intent)) {
                 // This intent may leave Chrome.  Warn the user that incognito does not carry over
                 // to apps out side of Chrome.
                 mDelegate.startIncognitoIntent(intent, params.getReferrerUrl(),
                         hasBrowserFallbackUrl ? browserFallbackUrl : null, params.getTab(),
                         params.shouldCloseContentsOnOverrideUrlLoadingAndLaunchIntent());
                 return OverrideUrlLoadingResult.OVERRIDE_WITH_ASYNC_ACTION;
             } else {
+
                 // Some third-party app launched Chrome with an intent, and the URL got redirected.
                 // The user has explicitly chosen Chrome over other intent handlers, so stay in
                 // Chrome unless there was a new intent handler after redirection or Chrome cannot
                 // handle it any more.
                 if (params.getRedirectHandler() != null && incomingIntentRedirect) {
                     if (!isExternalProtocol
                             && !params.getRedirectHandler().hasNewResolver(intent)) {
                         return OverrideUrlLoadingResult.NO_OVERRIDE;
                     }
                 }
                 // The intent can be used to launch Chrome itself, record the user
                 // gesture here so that it can be used later.
                 if (params.hasUserGesture()) {
                     IntentWithGesturesHandler.getInstance().onNewIntentWithGesture(intent);
                 }
+
                 if (mDelegate.startActivityIfNeeded(intent)) {
                     return OverrideUrlLoadingResult.OVERRIDE_WITH_EXTERNAL_INTENT;
                 } else {
                     return OverrideUrlLoadingResult.NO_OVERRIDE;
                 }
             }
         } catch (ActivityNotFoundException ex) {
             // Ignore the error. If no application can handle the URL,
             // assume the browser can handle it.
         }
@@ skipping 54 matching lines @@
         if (defaultSmsPackageName == null) return null;
         // Makes sure that the default SMS app actually resolves the intent.
         for (ResolveInfo resolveInfo : resolvingComponentNames) {
             if (defaultSmsPackageName.equals(resolveInfo.activityInfo.packageName)) {
                 return defaultSmsPackageName;
             }
         }
         return null;
     }
 }