Expose API to detect when captive portal probe was blocked on Android

net/android/java/src/org/chromium/net/NetworkChangeNotifier.java

Index: net/android/java/src/org/chromium/net/NetworkChangeNotifier.java
diff --git a/net/android/java/src/org/chromium/net/NetworkChangeNotifier.java b/net/android/java/src/org/chromium/net/NetworkChangeNotifier.java
index 20f1013801b8ccf44aed9e2dd7bd892b11d4369d..cfe547e1bae3ac7475ce550a7689dbfea42104b3 100644
--- a/net/android/java/src/org/chromium/net/NetworkChangeNotifier.java
+++ b/net/android/java/src/org/chromium/net/NetworkChangeNotifier.java
@@ -98,6 +98,17 @@ public class NetworkChangeNotifier {
     }
 
     /**
+     * Returns true if the captive portal probe was blocked for the current network.

[pauljensen, 2016/11/16 16:10:23]

current->current default

+     * May incorrectly return true if the user has signed into the captive portal since the
+     * network was last probed.
+     * Only available on Lollipop and newer releases.

[pauljensen, 2016/11/16 16:10:23]

Lollipop->Marshmallow

[pauljensen, 2016/11/16 16:10:23]

Mention what is returned on older releases.

+     */
+    @CalledByNative
+    public boolean getCurrentNetworkCaptivePortal() {
+        return mAutoDetector == null ? false : mAutoDetector.getCurrentNetworkCaptivePortal();
+    }
+
+    /**
      * Returns an array of all of the device's currently connected
      * networks and ConnectionTypes. Array elements are a repeated sequence of:
      *   NetID of network