Add an assert_no_deps variable to GN.

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 <stddef.h>
 
 #include "tools/gn/action_target_generator.h"
 #include "tools/gn/binary_target_generator.h"
@@ skipping 32 matching lines @@
 
   if (!FillData())
     return;
 
   if (!FillDependencies())
     return;
 
   if (!FillTestonly())
     return;
 
+  if (!FillAssertNoDeps())
+    return;
+
   if (!Visibility::FillItemVisibility(target_, scope_, err_))
     return;
 
   // Do type-specific generation.
   DoRun();
 }
 
 // static
 void TargetGenerator::GenerateTarget(Scope* scope,
                                      const FunctionCallNode* function_call,
@@ skipping 196 matching lines @@
 bool TargetGenerator::FillTestonly() {
   const Value* value = scope_->GetValue(variables::kTestonly, true);
   if (value) {
     if (!value->VerifyTypeIs(Value::BOOLEAN, err_))
       return false;
     target_->set_testonly(value->boolean_value());
   }
   return true;
 }
 
+bool TargetGenerator::FillAssertNoDeps() {
+  const Value* value = scope_->GetValue(variables::kAssertNoDeps, true);
+  if (value) {
+    return ExtractListOfLabelPatterns(*value, scope_->GetSourceDir(),
+                                      &target_->assert_no_deps(), err_);
+  }
+  return true;
+}
+
 bool TargetGenerator::FillOutputs(bool allow_substitutions) {
   const Value* value = scope_->GetValue(variables::kOutputs, true);
   if (!value)
     return true;
 
   SubstitutionList& outputs = target_->action_values().outputs();
   if (!outputs.Parse(*value, err_))
     return false;
 
   if (!allow_substitutions) {
@@ skipping 75 matching lines @@
 
 bool TargetGenerator::FillGenericDeps(const char* var_name,
                                       LabelTargetVector* dest) {
   const Value* value = scope_->GetValue(var_name, true);
   if (value) {
     ExtractListOfLabels(*value, scope_->GetSourceDir(),
                         ToolchainLabelForScope(scope_), dest, err_);
   }
   return !err_->has_error();
 }