I just tried a local  

ninja -C out_android/Debug all

with findbugs enabled from an up to date master checkout, and I got:

FAILED: gen/content/shell/android/content_shell_test_java__findbugs/result.xml 
python ../../build/android/findbugs_diff.py --depfile gen/content/shell/android/content_shell_test_java__findbugs.d --exclude ../../build/android/findbugs_filter/findbugs_exclude.xml --auxclasspath-gyp @FileArg\(gen/content/shell/android/content_shell_test_java.build_config:javac:classpath\) --output-file gen/content/shell/android/content_shell_test_java__findbugs/result.xml lib.java/content/shell/android/content_shell_test_java.jar

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FindBugs run via:
java -classpath /ssd/clankium/src/third_party/findbugs/lib/findbugs.jar: -Xmx768m -Dfindbugs.home="/ssd/clankium/src/third_party/findbugs" -jar /ssd/clankium/src/third_party/findbugs/lib/findbugs.jar -textui -sortByClass -pluginList /ssd/clankium/src/tools/android/findbugs_plugin/lib/chromiumPlugin.jar -xml:withMessages -auxclasspath /ssd/clankium/src/third_party/android_tools/sdk/platforms/android-23/android.jar:/ssd/clankium/src/out_android/Debug/lib.java/content/shell/android/content_shell_apk_java.jar:/ssd/clankium/src/out_android/Debug/lib.java/content/shell/android/content_shell_java.jar:/ssd/clankium/src/out_android/Debug/lib.java/base/base_java.jar:/ssd/clankium/src/out_android/Debug/lib.java/base/base_java_test_support.jar:/ssd/clankium/src/out_android/Debug/lib.java/content/public/android/content_java.jar:/ssd/clankium/src/out_android/Debug/lib.java/content/public/test/android/content_java_test_support.jar:/ssd/clankium/src/out_android/Debug/lib.java/content/shell/android/content_shell_java.jar:/ssd/clankium/src/out_android/Debug/lib.java/ui/android/ui_java.jar -exclude /ssd/clankium/src/build/android/findbugs_filter/findbugs_exclude.xml -output gen/content/shell/android/content_shell_test_java__findbugs/result.xml /ssd/clankium/src/out_android/Debug/lib.java/content/shell/android/content_shell_test_java.jar

FindBugs reported the following issues:
IJU_SETUP_NO_SUPER: TestCase defines setUp that doesn't call super.setUp()
  In class org.chromium.content_shell_apk.ContentShellTestBase
  In method org.chromium.content_shell_apk.ContentShellTestBase.setUp()
  Overrides android.test.ActivityInstrumentationTestCase2.setUp()
  At ContentShellTestBase.java:[line 61]
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Looking at the code, this error looks justified, but I don't know why we are not seeing this on the bots (maybe this code is never put through findbugs on the bots.

The code is recent, so assigning to the author (amaralp@)