Add support for data deps.

tools/gn/toolchain_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/toolchain_manager.h"
 
 #include <set>
 
 #include "base/bind.h"
 #include "build/build_config.h"
@@ skipping 25 matching lines @@
   scope->SetValue("is_mac", Value(NULL, 1), NULL);
 #else
   scope->SetValue("is_mac", Value(NULL, 0), NULL);
 #endif
 
 #if defined(OS_LINUX)
   scope->SetValue("is_linux", Value(NULL, 1), NULL);
 #else
   scope->SetValue("is_linux", Value(NULL, 0), NULL);
 #endif
-
-  // Set this value without the terminating slash because the code expects
-  // $root_output_dir/foo to work.
-  scope->SetValue(ScopePerFileProvider::kRootOutputDirName,
-                  ScopePerFileProvider::GetRootOutputDir(&settings),
-                  NULL);
-  scope->SetValue(ScopePerFileProvider::kRootGenDirName,
-                  ScopePerFileProvider::GetRootGenDir(&settings),
-                  NULL);
 }
 
 }  // namespace
 
 struct ToolchainManager::Info {
   Info(const BuildSettings* build_settings,
        const Label& toolchain_name,
        const std::string& output_subdir_name)
       : state(TOOLCHAIN_SETTINGS_NOT_LOADED),
         toolchain(toolchain_name),
@@ skipping 432 matching lines @@
     if (err.has_error())
       g_scheduler->FailWithError(err);
   }
 
   g_scheduler->DecrementWorkCount();
 }
 
 base::Lock& ToolchainManager::GetLock() const {
   return build_settings_->item_tree().lock();
 }