Hook up clang_use_chrome_plugins to the GN build.

Previously this was ignored in the GN build but disabling the plugin is used on some buildbots.

BUG=http://crbug.com/330298
R=thakis@chromium.org, thakis

Review URL: https://codereview.chromium.org/142053002

git-svn-id: http://src.chromium.org/svn/trunk/src/build@245602 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

config/clang/BUILD.gn

@@ -2,24 +2,32 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-config("find_bad_constructs") {
-  cflags = [
-    "-Xclang", "-load",
-    "-Xclang",
-  ]
-
-  if (is_mac) {
-    cflags += [ rebase_path(
-      "//third_party/llvm-build/Release+Asserts/lib/libFindBadConstructs.dylib",
-      ".", root_build_dir) ]
-  } else if (is_linux) {
-    cflags += [ rebase_path(
-      "//third_party/llvm-build/Release+Asserts/lib/libFindBadConstructs.so",
-      ".", root_build_dir) ]
-  }
-
-  cflags += [
-    "-Xclang", "-add-plugin",
-    "-Xclang", "find-bad-constructs",
-  ]
+declare_args() {
+  # Indicates if the build should use the Chrome-specific plugins for enforcing
+  # coding guidelines, etc.
+  clang_use_chrome_plugins = true
+}
+
+config("find_bad_constructs") {
+  if (clang_use_chrome_plugins) {
+    cflags = [
+      "-Xclang", "-load",
+      "-Xclang",
+    ]
+
+    if (is_mac) {
+      cflags += [ rebase_path(
+        "//third_party/llvm-build/Release+Asserts/lib/libFindBadConstructs.dylib",
+        ".", root_build_dir) ]
+    } else if (is_linux) {
+      cflags += [ rebase_path(
+        "//third_party/llvm-build/Release+Asserts/lib/libFindBadConstructs.so",
+        ".", root_build_dir) ]
+    }
+
+    cflags += [
+      "-Xclang", "-add-plugin",
+      "-Xclang", "find-bad-constructs",
+    ]
+  }
 }

gyp_chromium

@@ -164,7 +164,6 @@ def GetArgsStringForGN(supplemental_files):
   #   host_os=linux  Probably can skip, GN knows the host OS.
   #   order_text_section=<path>   http://crbug.com/330299
   #   chromium_win_pch=0          http://crbug.com/297678
-  #   clang_use_chrome_plugins=1  http://crbug.com/330298
   #   chromium_ios_signing=0      http://crbug.com/330302
   #   linux_use_tcmalloc=0        http://crbug.com/330303
   #   release_extra_flags=...     http://crbug.com/330305
@@ -177,6 +176,7 @@ def GetArgsStringForGN(supplemental_files):
       ('buildtype', 'Official', 'is_official_build=true'),
       ('component', 'shared_library', 'is_component_build=true'),
       ('clang', '1', 'is_clang=true'),
+      ('clang_use_chrome_plugins', '0', 'clang_use_chrome_plugins=false'),
       ('disable_glibcxx_debug', '1', 'disable_glibcxx_debug=true'),
       ('target_arch', 'ia32', 'cpu_arch="x86"'),
       ('target_arch', 'x64', 'cpu_arch="x64" force_win64=true'),