Use the Errorprone Compiler

build/host_jar.gypi

Index: build/host_jar.gypi
diff --git a/build/host_jar.gypi b/build/host_jar.gypi
index 9c35177872ce92e36fe42e872a2c55798e0b4d5d..6cddcbaa5e9be7204bde56d9ec507a7693f7a20b 100644
--- a/build/host_jar.gypi
+++ b/build/host_jar.gypi
@@ -53,6 +53,8 @@
     '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': {
@@ -75,7 +77,13 @@
           }],
           ['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': [
@@ -83,6 +91,7 @@
         '<(DEPTH)/build/android/gyp/javac.py',
         '^@(java_sources)',
         '>@(input_jars_paths)',
+        '<@(extra_inputs)',
       ],
       'outputs': [
         '<(jar_path)',