Implement net/ support for Android's NetworkSecurityPolicy

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

Index: net/android/java/src/org/chromium/net/AndroidNetworkLibrary.java
diff --git a/net/android/java/src/org/chromium/net/AndroidNetworkLibrary.java b/net/android/java/src/org/chromium/net/AndroidNetworkLibrary.java
index 1656e2c38565ed038441a860e007ae0f9eb28304..67c988264d0f85c5905b5f3ad32f5731077ecd7d 100644
--- a/net/android/java/src/org/chromium/net/AndroidNetworkLibrary.java
+++ b/net/android/java/src/org/chromium/net/AndroidNetworkLibrary.java
@@ -17,12 +17,14 @@ import android.net.wifi.WifiInfo;
 import android.net.wifi.WifiManager;
 import android.os.Build;
 import android.security.KeyChain;
+import android.security.NetworkSecurityPolicy;
 import android.telephony.TelephonyManager;
 import android.util.Log;
 
 import org.chromium.base.annotations.CalledByNative;
 import org.chromium.base.annotations.CalledByNativeUnchecked;
 
+import java.lang.reflect.Method;
 import java.net.NetworkInterface;
 import java.net.SocketException;
 import java.net.URLConnection;
@@ -243,4 +245,34 @@ class AndroidNetworkLibrary {
         }
         return "";
     }
+
+    /**
+     * Returns true if cleartext traffic to |host| is allowed by the current app. Always true on L
+     * and older.
+     */
+    @TargetApi(Build.VERSION_CODES.N)
+    @CalledByNative
+    private static boolean isCleartextPermitted(String host) {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
+            NetworkSecurityPolicy policy = NetworkSecurityPolicy.getInstance();
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
+                return policy.isCleartextTrafficPermitted(host);
+            }
+            return policy.isCleartextTrafficPermitted();
+        }
+        return true;
+    }
+
+    /**
+     * Helper for tests that simulates an app disallowing cleartext traffic entirely.
+     */
+    @TargetApi(Build.VERSION_CODES.M)
+    @CalledByNative
+    private static void setUpSecurityPolicyForTesting() throws Exception {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
+            Method setCleartextTrafficPermitted = NetworkSecurityPolicy.class.getDeclaredMethod(
+                    "setCleartextTrafficPermitted", boolean.class);
+            setCleartextTrafficPermitted.invoke(NetworkSecurityPolicy.getInstance(), false);
+        }
+    }
 }