Receive intent callbacks without launching intents

ui/android/java/src/org/chromium/ui/base/ActivityWindowAndroid.java

Index: ui/android/java/src/org/chromium/ui/base/ActivityWindowAndroid.java
diff --git a/ui/android/java/src/org/chromium/ui/base/ActivityWindowAndroid.java b/ui/android/java/src/org/chromium/ui/base/ActivityWindowAndroid.java
index ddc2ddd462a8639f31e878f2510b78c145363dfa..239315d342c77ad4a9735d001a33ef0c435fa905 100644
--- a/ui/android/java/src/org/chromium/ui/base/ActivityWindowAndroid.java
+++ b/ui/android/java/src/org/chromium/ui/base/ActivityWindowAndroid.java
@@ -24,6 +24,7 @@ import android.view.View;
 
 import org.chromium.base.ActivityState;
 import org.chromium.base.ApplicationStatus;
+import org.chromium.base.Callback;
 import org.chromium.ui.UiUtils;
 
 import java.lang.ref.WeakReference;
@@ -130,6 +131,20 @@ public class ActivityWindowAndroid
     }
 
     @Override
+    public int showCancelableIntent(Callback<Integer> intentTrigger, IntentCallback callback,
+            Integer errorId) {
+        Activity activity = getActivity().get();
+        if (activity == null) return START_INTENT_FAILURE;
+
+        int requestCode = generateNextRequestCode();
+
+        intentTrigger.onResult(requestCode);
+
+        storeCallbackData(requestCode, callback, errorId);
+        return requestCode;
+    }
+
+    @Override
     public void cancelIntent(int requestCode) {
         Activity activity = getActivity().get();
         if (activity == null) return;