Add get_target_outputs function to GN

tools/gn/function_toolchain.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/err.h"
 #include "tools/gn/functions.h"
 #include "tools/gn/parse_tree.h"
 #include "tools/gn/scheduler.h"
 #include "tools/gn/scope.h"
 #include "tools/gn/settings.h"
@@ skipping 101 matching lines @@
   Scope block_scope(scope);
   block_scope.SetProperty(&kToolchainPropertyKey, toolchain.get());
   block->ExecuteBlockInScope(&block_scope, err);
   block_scope.SetProperty(&kToolchainPropertyKey, NULL);
   if (err->has_error())
     return Value();
 
   if (!block_scope.CheckForUnusedVars(err))
     return Value();
 
-  scope->settings()->build_settings()->ItemDefined(toolchain.PassAs<Item>());
+  // Save this target for the file.
+  Scope::ItemVector* collector = scope->GetItemCollector();
+  if (!collector) {
+    *err = Err(function, "Can't define a toolchain in this context.");
+    return Value();
+  }
+  collector->push_back(new scoped_ptr<Item>(toolchain.PassAs<Item>()));
   return Value();
 }
 
 // tool ------------------------------------------------------------------------
 
 const char kTool[] = "tool";
 const char kTool_HelpShort[] =
     "tool: Specify arguments to a toolchain tool.";
 const char kTool_Help[] =
     "tool: Specify arguments to a toolchain tool.\n"
@@ skipping 168 matching lines @@
     return Value();
 
   Scope::KeyValueMap values;
   block_scope.GetCurrentScopeValues(&values);
   toolchain->args() = values;
 
   return Value();
 }
 
 }  // namespace functions