Use the Errorprone Compiler

build/host_jar.gypi

 # 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.
 
 # This file is meant to be included into a target to provide a rule to build
 # a JAR file for use on a host in a consistent manner. If a main class is
 # specified, this file will also generate an executable to run the jar in the
 # output folder's /bin/ directory.
 #
 # To use this, create a gyp target with the following form:
@@ skipping 35 matching lines @@
     'excluded_src_paths': [],
     'generated_src_dirs': [],
     'input_jars_paths': [],
     'intermediate_dir': '<(SHARED_INTERMEDIATE_DIR)/<(_target_name)',
     'jar_dir': '<(PRODUCT_DIR)/lib.java',
     'jar_excluded_classes': [],
     'jar_name': '<(_target_name).jar',
     'jar_path': '<(jar_dir)/<(jar_name)',
     'main_class%': '',
     'stamp': '<(intermediate_dir)/jar.stamp',
+    'enable_errorprone%': '0',
+    'errorprone_exe_path': '<(PRODUCT_DIR)/bin.java/chromium_errorprone',
   },
   'all_dependent_settings': {
     'variables': {
       'input_jars_paths': ['<(jar_path)']
     },
   },
   'actions': [
     {
       'action_name': 'javac_<(_target_name)',
       'message': 'Compiling <(_target_name) java sources',
       'variables': {
         'extra_options': [],
         'java_sources': [ '<!@(find <@(src_paths) -name "*.java")' ],
         'conditions': [
           ['"<(excluded_src_paths)" != ""', {
             'java_sources!': ['<!@(find <@(excluded_src_paths) -name "*.java")']
           }],
           ['"<(jar_excluded_classes)" != ""', {
             'extra_options': ['--jar-excluded-classes=<(jar_excluded_classes)']
           }],
           ['main_class != ""', {
             'extra_options': ['--main-class=>(main_class)']
-          }]
+          }],
+          ['enable_errorprone == 1', {
+            'extra_inputs': [
+              '<(errorprone_exe_path)',
+            ],
+            'extra_options': [ '--use-errorprone-path=<(errorprone_exe_path)' ],
+          }],
         ],
       },
       'inputs': [
         '<(DEPTH)/build/android/gyp/util/build_utils.py',
         '<(DEPTH)/build/android/gyp/javac.py',
         '^@(java_sources)',
         '>@(input_jars_paths)',
+        '<@(extra_inputs)',
       ],
       'outputs': [
         '<(jar_path)',
         '<(stamp)',
       ],
       'action': [
         'python', '<(DEPTH)/build/android/gyp/javac.py',
         '--classpath=>(input_jars_paths)',
         '--src-gendirs=>(generated_src_dirs)',
         '--chromium-code=<(chromium_code)',
@@ skipping 26 matching lines @@
             '--jar-path=<(jar_path)',
             '--output=<(output)',
             '--main-class=>(main_class)',
           ]
         }
       ]
     }]
   ]
 }