gn: Allow users to set 'check_includes' in action_foreach().

tools/gn/target_generator.cc

 // Copyright (c) 2013 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.
 
 #include "tools/gn/target_generator.h"
 
 #include "tools/gn/action_target_generator.h"
 #include "tools/gn/binary_target_generator.h"
 #include "tools/gn/build_settings.h"
 #include "tools/gn/config.h"
@@ skipping 265 matching lines @@
   // Validate that outputs are in the output dir.
   CHECK(outputs.list().size() == value->list_value().size());
   for (size_t i = 0; i < outputs.list().size(); i++) {
     if (!EnsureSubstitutionIsInOutputDir(outputs.list()[i],
                                          value->list_value()[i]))
       return false;
   }
   return true;
 }
 
+bool TargetGenerator::FillCheckIncludes() {
+  const Value* value = scope_->GetValue(variables::kCheckIncludes, true);
+  if (!value)
+    return true;
+  if (!value->VerifyTypeIs(Value::BOOLEAN, err_))
+    return false;
+  target_->set_check_includes(value->boolean_value());
+  return true;
+}
+
 bool TargetGenerator::EnsureSubstitutionIsInOutputDir(
     const SubstitutionPattern& pattern,
     const Value& original_value) {
   if (pattern.ranges().empty()) {
     // Pattern is empty, error out (this prevents weirdness below).
     *err_ = Err(original_value, "This has an empty value in it.");
     return false;
   }
 
   if (pattern.ranges()[0].type == SUBSTITUTION_LITERAL) {
@@ skipping 41 matching lines @@
 bool TargetGenerator::FillForwardDependentConfigs() {
   const Value* value = scope_->GetValue(
       variables::kForwardDependentConfigsFrom, true);
   if (value) {
     ExtractListOfUniqueLabels(*value, scope_->GetSourceDir(),
                               ToolchainLabelForScope(scope_),
                               &target_->forward_dependent_configs(), err_);
   }
   return !err_->has_error();
 }