Make android lint suppressions file overridable.

build/config/android/internal_rules.gni

 # 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.
 
+import("//build_overrides/build.gni")
 import("//build/config/android/config.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 
 assert(is_android)
 
 # These identify targets that have .build_config files (except for android_apk,
 # java_binary, resource_rewriter, since we never need to depend on these).
 _java_target_whitelist = [
   "*:*_java",
   "*:*_javalib",
@@ skipping 626 matching lines @@
       forward_variables_from(invoker,
                              [
                                "deps",
                                "data_deps",
                                "public_deps",
                                "testonly",
                              ])
       if (!defined(deps)) {
         deps = []
       }
+
+      if (!defined(lint_suppressions_file)) {
+        lint_suppressions_file = "//build/android/lint/suppressions.xml"

[agrieve, 2016/08/30 14:36:37]

nit: Can you either set this default value in //build_overrides/build.gni, or
add a comment there about this being an overridable value?

+      }
+
       _cache_dir = "$root_build_dir/android_lint_cache"
       _result_path = "$target_gen_dir/$target_name/result.xml"
       _config_path = "$target_gen_dir/$target_name/config.xml"
-      _suppressions_file = "//build/android/lint/suppressions.xml"
+      _suppressions_file = lint_suppressions_file
       _platform_xml_path =
           "${android_sdk_root}/platform-tools/api/api-versions.xml"
       _rebased_lint_android_sdk_root =
           rebase_path(lint_android_sdk_root, root_build_dir)
 
       script = "//build/android/gyp/lint.py"
       depfile = "$target_gen_dir/$target_name.d"
       inputs = [
         _platform_xml_path,
         _suppressions_file,
@@ skipping 1964 matching lines @@
       outputs = [
         depfile,
         invoker.out_manifest,
       ]
       inputs = [
         invoker.main_manifest,
       ]
     }
   }
 }