Use the Errorprone Compiler

third_party/errorprone/errorprone.gyp

+# 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.
+
+{
+  'targets': [
+    {
+      # GN: //third_party/errorprone:errorprone_java
+      'target_name': 'errorprone_java',
+      'type': 'none',
+      'variables': {
+        'jar_path': 'error_prone_core-1.1.2.jar',
+      },
+      'includes': [
+        '../../build/host_prebuilt_jar.gypi',
+      ]
+    },
+    {
+      # GN: //third_party/errorprone:chromium_errorprone
+      'target_name': 'chromium_errorprone',
+      'type': 'none',
+      'variables': {
+        'src_paths': [
+          'src/org/chromium/errorprone/ChromiumErrorProneCompiler.java',
+        ],
+        'disable_errorprone': 1,

[cjhopman, 2015/05/20 02:21:29]

change to:
'enable_errorprone': 0

[raywilliams_chromium, 2015/05/20 21:31:55]

Done.

+      },
+      'dependencies': [
+        '../../build/android/setup.gyp:sun_tools_java',
+        'errorprone_java',
+      ],
+      'includes': [
+        '../../build/host_jar.gypi',
+      ],
+      'actions': [
+        {
+          'action_name': 'create_errorprone_binary_script',
+          'inputs': [
+            '<(DEPTH)/build/android/gyp/create_java_binary_script.py',
+            '<(DEPTH)/build/android/gyp/util/build_utils.py',
+            # Ensure that the script is touched when the jar is.
+            '<(jar_path)',
+          ],
+          'outputs': [
+            '<(PRODUCT_DIR)/bin.java/chromium_errorprone'
+          ],
+          'action': [
+            'python', '<(DEPTH)/build/android/gyp/create_java_binary_script.py',
+            '--output', '<(PRODUCT_DIR)/bin.java/chromium_errorprone',
+            '--classpath=>@(input_jars_paths)',
+            '--jar-path=<(jar_path)',
+            '--main-class=org.chromium.errorprone.ChromiumErrorProneCompiler',
+          ],
+        },
+      ],
+    },
+  ],
+}