[Android] Incorporate findbugs into android builds.

android_webview/glue/java/src/com/android/webview/chromium/WebBackForwardListChromium.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 com.android.webview.chromium;
 
 import android.webkit.WebBackForwardList;
 import android.webkit.WebHistoryItem;
 
+import org.chromium.base.annotations.SuppressFBWarnings;
 import org.chromium.content_public.browser.NavigationHistory;
 
 import java.util.ArrayList;
 import java.util.List;
 
 /**
  * WebView Chromium implementation of WebBackForwardList. Simple immutable
  * wrapper around NavigationHistory.
  */
+@SuppressFBWarnings({
+        "CHROMIUM_SYNCHRONIZED_METHOD",
+        "SE_BAD_FIELD"})
 public class WebBackForwardListChromium extends WebBackForwardList {
     private final List<WebHistoryItemChromium> mHistroryItemList;
     private final int mCurrentIndex;
 
     /* package */ WebBackForwardListChromium(NavigationHistory navHistory) {
         mCurrentIndex = navHistory.getCurrentEntryIndex();
         mHistroryItemList = new ArrayList<WebHistoryItemChromium>(navHistory.getEntryCount());
         for (int i = 0; i < navHistory.getEntryCount(); ++i) {
             mHistroryItemList.add(new WebHistoryItemChromium(navHistory.getEntryAtIndex(i)));
         }
@@ skipping 50 matching lines @@
      */
     @Override
     protected synchronized WebBackForwardListChromium clone() {
         List<WebHistoryItemChromium> list = new ArrayList<WebHistoryItemChromium>(getSize());
         for (int i = 0; i < getSize(); ++i) {
             list.add(mHistroryItemList.get(i).clone());
         }
         return new WebBackForwardListChromium(list, mCurrentIndex);
     }
 }