Add testonly flag 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 "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 30 matching lines @@
     return;
 
   FillData();
   if (err_->has_error())
     return;
 
   FillDependencies();
   if (err_->has_error())
     return;
 
+  FillTestonly();
+  if (err_->has_error())
+    return;
+
   if (!Visibility::FillItemVisibility(target_, scope_, err_))
     return;
 
   // Do type-specific generation.
   DoRun();
 }
 
 // static
 void TargetGenerator::GenerateTarget(Scope* scope,
                                      const FunctionCallNode* function_call,
@@ skipping 149 matching lines @@
   if (err_->has_error())
     return;
 
   // This is a list of dependent targets to have their configs fowarded, so
   // it goes here rather than in FillConfigs.
   FillForwardDependentConfigs();
   if (err_->has_error())
     return;
 }
 
+void TargetGenerator::FillTestonly() {
+  const Value* value = scope_->GetValue(variables::kTestonly, true);
+  if (value) {
+    if (!value->VerifyTypeIs(Value::BOOLEAN, err_))
+      return;
+    target_->set_testonly(value->boolean_value());
+  }
+}
+
 void TargetGenerator::FillOutputs(bool allow_substitutions) {
   const Value* value = scope_->GetValue(variables::kOutputs, true);
   if (!value)
     return;
 
   SubstitutionList& outputs = target_->action_values().outputs();
   if (!outputs.Parse(*value, err_))
     return;
 
   if (!allow_substitutions) {
@@ skipping 72 matching lines @@
 
 void TargetGenerator::FillForwardDependentConfigs() {
   const Value* value = scope_->GetValue(
       variables::kForwardDependentConfigsFrom, true);
   if (value) {
     ExtractListOfUniqueLabels(*value, scope_->GetSourceDir(),
                               ToolchainLabelForScope(scope_),
                               &target_->forward_dependent_configs(), err_);
   }
 }