Support C and Objective-C in jumbo base scripts.

third_party/WebKit/Source/core/css/BUILD.gn

 # Copyright 2016 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("//third_party/WebKit/Source/core/core.gni")
 
 blink_core_sources("css") {
   split_count = 5
   sources = [
     "ActiveStyleSheets.cpp",
@@ skipping 574 matching lines @@
     "resolver/StyleResolverStats.h",
     "resolver/StyleRuleUsageTracker.cpp",
     "resolver/StyleRuleUsageTracker.h",
     "resolver/StyleSharingDepthScope.h",
     "resolver/TransformBuilder.cpp",
     "resolver/TransformBuilder.h",
     "resolver/ViewportStyleResolver.cpp",
     "resolver/ViewportStyleResolver.h",
   ]
 
+  if (is_win) {
+    jumbo_excluded_sources = [
+      # For some reason
+      # using CSSCursorImageValue = cssvalue::CSSCursorImageValue;
+      # makes VS confused. Afterwards it doesn't know whether to use
+      # blink::cssvalue or blink directly. Maybe there is a "using
+      # cssvalue" somewhere?
+      "properties/CSSPropertyAPIContent.cpp",
+      "properties/CSSPropertyAPICursor.cpp",
+    ]
+  }
+
   configs += [
     # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
     "//build/config/compiler:no_size_t_to_int_warning",
   ]
 }