Improve GN public header file checking

tools/gn/input_file_manager.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/input_file_manager.h"
 
 #include "base/bind.h"
 #include "base/stl_util.h"
 #include "tools/gn/filesystem_utils.h"
 #include "tools/gn/parser.h"
@@ skipping 149 matching lines @@
   }
 
   // The other load could have failed. In this case that error will be printed
   // to the console, but we need to return something here, so make up a
   // dummy error.
   if (!data->parsed_root)
     *err = Err(origin, "File parse failed");
   return data->parsed_root.get();
 }
 
-void InputFileManager::AddDynamicInput(InputFile** file,
+void InputFileManager::AddDynamicInput(const SourceFile& name,
+                                       InputFile** file,
                                        std::vector<Token>** tokens,
                                        scoped_ptr<ParseNode>** parse_root) {
-  InputFileData* data = new InputFileData(SourceFile());
+  InputFileData* data = new InputFileData(name);
   {
     base::AutoLock lock(lock_);
     dynamic_inputs_.push_back(data);
   }
   *file = &data->file;
   *tokens = &data->tokens;
   *parse_root = &data->parsed_root;
 }
 
 int InputFileManager::GetInputFileCount() const {
@@ skipping 100 matching lines @@
     callbacks.swap(data->scheduled_callbacks);
   }
 
   // Run pending invocations. Theoretically we could schedule each of these
   // separately to get some parallelism. But normally there will only be one
   // item in the list, so that's extra overhead and complexity for no gain.
   for (size_t i = 0; i < callbacks.size(); i++)
     callbacks[i].Run(unowned_root);
   return true;
 }