[Android] Incorporate findbugs into android builds.

android_webview/java/src/org/chromium/android_webview/AwContents.java

Index: android_webview/java/src/org/chromium/android_webview/AwContents.java
diff --git a/android_webview/java/src/org/chromium/android_webview/AwContents.java b/android_webview/java/src/org/chromium/android_webview/AwContents.java
index b2ab9d7db52e1fd6cfe82f4562b1a8ce215e27d1..b6a926fc3897245ce185152cc30c24903d134f8b 100644
--- a/android_webview/java/src/org/chromium/android_webview/AwContents.java
+++ b/android_webview/java/src/org/chromium/android_webview/AwContents.java
@@ -46,6 +46,7 @@ import org.chromium.base.JNINamespace;
 import org.chromium.base.ThreadUtils;
 import org.chromium.base.TraceEvent;
 import org.chromium.base.VisibleForTesting;
+import org.chromium.base.annotations.SuppressFBWarnings;
 import org.chromium.components.navigation_interception.InterceptNavigationDelegate;
 import org.chromium.components.navigation_interception.NavigationParams;
 import org.chromium.content.browser.ContentViewClient;
@@ -2349,6 +2350,7 @@ public class AwContents implements SmartClipProvider,
     }
 
     // Called as a result of nativeUpdateLastHitTestData.
+    @SuppressFBWarnings("URF_UNREAD_PUBLIC_OR_PROTECTED_FIELD")
     @CalledByNative
     private void updateHitTestData(
             int type, String extra, String href, String anchorText, String imgSrc) {