[Android] Incorporate findbugs into android builds.

components/devtools_bridge/test/android/javatests/src/org/chromium/components/devtools_bridge/SignalingReceiverMock.java

 // Copyright 2014 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.components.devtools_bridge;
 
+import org.chromium.base.annotations.SuppressFBWarnings;
+
 import java.util.List;
 
 /**
  * Mock of SignalingReceiver.
  */
+@SuppressFBWarnings("URF_UNREAD_PUBLIC_OR_PROTECTED_FIELD")
 public class SignalingReceiverMock implements SignalingReceiver {
     public String sessionId;
     public String offer;
     public SessionBase.NegotiationCallback negotiationCallback;
     public SessionBase.IceExchangeCallback iceExchangeCallback;
 
     @Override
     public void startSession(
             String sessionId,
             RTCConfiguration config,
@@ skipping 16 matching lines @@
 
     @Override
     public void iceExchange(
             String sessionId,
             List<String> clientCandidates,
             SessionBase.IceExchangeCallback callback) {
         this.sessionId = sessionId;
         this.iceExchangeCallback = callback;
     }
 }