Add get_target_outputs function to GN

tools/gn/template.cc

 // Copyright 2014 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/template.h"
 
 #include "tools/gn/err.h"
 #include "tools/gn/functions.h"
 #include "tools/gn/parse_tree.h"
 #include "tools/gn/scope.h"
@@ skipping 44 matching lines @@
   // template (which ScopePerFileProvider uses to base the target-related
   // variables target_gen_dir and target_out_dir on) to be that of the invoker.
   // This way, files don't have to be rebased and target_*_dir works the way
   // people expect (otherwise its to easy to be putting generated files in the
   // gen dir corresponding to an imported file).
   Scope template_scope(closure_.get());
   template_scope.set_source_dir(scope->GetSourceDir());
 
   ScopePerFileProvider per_file_provider(&template_scope, true);
 
+  // Targets defined in the template go in the collector for the invoking file.
+  template_scope.set_item_collector(scope->GetItemCollector());
+
   // We jump through some hoops to avoid copying the invocation scope when
   // setting it in the template scope (since the invocation scope may have
   // large lists of source files in it and could be expensive to copy).
   //
   // Scope.SetValue will copy the value which will in turn copy the scope, but
   // if we instead create a value and then set the scope on it, the copy can
   // be avoided.
   const char kInvoker[] = "invoker";
   template_scope.SetValue(kInvoker, Value(NULL, scoped_ptr<Scope>()),
                           invocation);
@@ skipping 29 matching lines @@
   // Check for unused variables in the template itself.
   if (!template_scope.CheckForUnusedVars(err))
     return Value();
 
   return result;
 }
 
 LocationRange Template::GetDefinitionRange() const {
   return definition_->GetRange();
 }