Use the Errorprone Compiler

build/java.gypi

Index: build/java.gypi
diff --git a/build/java.gypi b/build/java.gypi
index 730fa2222a7417c1684ea6f23a40e17b058d4cb7..3e72cab5bcbd05683b5b12ac018f0240e81e2e1a 100644
--- a/build/java.gypi
+++ b/build/java.gypi
@@ -81,6 +81,8 @@
     'run_findbugs%': 0,
     'proguard_config%': '',
     'proguard_preprocess%': '0',
+    'disable_errorprone%': '0',
+    'errorprone_exe_path': '<(PRODUCT_DIR)/bin.java/chromium_errorprone',
     'variables': {
       'variables': {
         'proguard_preprocess%': 0,
@@ -251,6 +253,17 @@
       'message': 'Compiling <(_target_name) java sources',
       'variables': {
         'java_sources': ['>!@(find >(java_in_dir)/src >(additional_src_dirs) -name "*.java")'],
+        'conditions': [
+          ['disable_errorprone == 0', {
+            'extra_inputs': [
+              '<(errorprone_exe_path)',
+            ],
+            'extra_args': [ '--errorprone-path=<(errorprone_exe_path)' ],
+          }, {
+            'extra_inputs': [],
+            'extra_args': [ '--disable-errorprone' ],
+          }],
+        ],
       },
       'inputs': [
         '<(DEPTH)/build/android/gyp/util/build_utils.py',
@@ -258,6 +271,7 @@
         '>@(java_sources)',
         '>@(input_jars_paths)',
         '>@(additional_input_paths)',
+        '<@(extra_inputs)',
       ],
       'outputs': [
         '<(compile_stamp)',
@@ -272,6 +286,7 @@
         '--jar-path=<(javac_jar_path)',
         '--jar-excluded-classes=<(jar_excluded_classes)',
         '--stamp=<(compile_stamp)',
+        '<@(extra_args)',
         '>@(java_sources)',
       ]
     },