Fix Facebook attribution stats when opening links from Facebook app.

chrome/android/java/src/org/chromium/chrome/browser/IntentHandler.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;
 
+import android.app.Activity;
 import android.app.KeyguardManager;
 import android.app.PendingIntent;
 import android.app.SearchManager;
 import android.content.ComponentName;
 import android.content.Context;
 import android.content.Intent;
 import android.net.Uri;
 import android.os.Bundle;
 import android.os.SystemClock;
 import android.provider.Browser;
@@ skipping 159 matching lines @@
     private static int sReferrerId;
     private static String sPendingIncognitoUrl;
 
     private static final String PACKAGE_GSA = "com.google.android.googlequicksearchbox";
     private static final String PACKAGE_GMAIL = "com.google.android.gm";
     private static final String PACKAGE_PLUS = "com.google.android.apps.plus";
     private static final String PACKAGE_HANGOUTS = "com.google.android.talk";
     private static final String PACKAGE_MESSENGER = "com.google.android.apps.messaging";
     private static final String PACKAGE_LINE = "jp.naver.line.android";
     private static final String PACKAGE_WHATSAPP = "com.whatsapp";
-    private static final String FACEBOOK_LINK_PREFIX = "http://m.facebook.com/l.php?";
+    private static final String FACEBOOK_REFERRER_URL = "android-app://m.facebook.com";
+    private static final String FACEBOOK_INTERNAL_BROWSER_REFERRER = "http://m.facebook.com";
     private static final String TWITTER_LINK_PREFIX = "http://t.co/";
     private static final String NEWS_LINK_PREFIX = "http://news.google.com/news/url?";
 
     /**
      * Represents popular external applications that can load a page in Chrome via intent.
      */
     public static enum ExternalAppId {
         OTHER,
         GMAIL,
         FACEBOOK,
@@ skipping 88 matching lines @@
      * Determines what App was used to fire this Intent.
      * @param packageName Package name of this application.
      * @param intent Intent that was used to launch Chrome.
      * @return ExternalAppId representing the app.
      */
     public static ExternalAppId determineExternalIntentSource(String packageName, Intent intent) {
         String appId = IntentUtils.safeGetStringExtra(intent, Browser.EXTRA_APPLICATION_ID);
         ExternalAppId externalId = ExternalAppId.OTHER;
         if (appId == null) {
             String url = getUrlFromIntent(intent);
+            String referrer = getReferrerUrl(intent);
             if (url != null && url.startsWith(TWITTER_LINK_PREFIX)) {
                 externalId = ExternalAppId.TWITTER;
-            } else if (url != null && url.startsWith(FACEBOOK_LINK_PREFIX)) {
+            } else if (FACEBOOK_REFERRER_URL.equals(referrer)) {
+                // This happens when "Links Open Externally" is checked in the Facebook app.
                 externalId = ExternalAppId.FACEBOOK;
             } else if (url != null && url.startsWith(NEWS_LINK_PREFIX)) {
                 externalId = ExternalAppId.NEWS;
+            } else {
+                Bundle headers = IntentUtils.safeGetBundleExtra(intent, Browser.EXTRA_HEADERS);
+                if (headers != null
+                        && FACEBOOK_INTERNAL_BROWSER_REFERRER.equals(headers.get("Referer"))) {
+                    // This happens when "Links Open Externally" is unchecked in the Facebook app,
+                    // and we use "Open With..." from the internal browser.
+                    externalId = ExternalAppId.FACEBOOK;
+                }
             }
         } else {
             if (appId.equals(PACKAGE_PLUS)) {
                 externalId = ExternalAppId.PLUS;
             } else if (appId.equals(PACKAGE_GMAIL)) {
                 externalId = ExternalAppId.GMAIL;
             } else if (appId.equals(PACKAGE_HANGOUTS)) {
                 externalId = ExternalAppId.HANGOUTS;
             } else if (appId.equals(PACKAGE_MESSENGER)) {
                 externalId = ExternalAppId.MESSENGER;
@@ skipping 739 matching lines @@
     }
 
     /**
      * @param intent An Intent to be checked.
      * @return The launch type of the tab to be created.
      */
     public static TabLaunchType getTabLaunchType(Intent intent) {
         return IntentUtils.safeGetSerializableExtra(intent, EXTRA_TAB_LAUNCH_TYPE);
     }
 }