Add support for module-definition files to gn

tools/gn/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/toolchain.h"
 
 #include <string.h>
 
 #include "base/logging.h"
 #include "tools/gn/target.h"
@@ skipping 98 matching lines @@
     case SOURCE_MM:
       return TYPE_OBJCXX;
     case SOURCE_ASM:
     case SOURCE_S:
       return TYPE_ASM;
     case SOURCE_RC:
       return TYPE_RC;
     case SOURCE_UNKNOWN:
     case SOURCE_H:
     case SOURCE_O:
+    case SOURCE_DEF:
       return TYPE_NONE;
     default:
       NOTREACHED();
       return TYPE_NONE;
   }
 }
 
 const Tool* Toolchain::GetToolForSourceType(SourceFileType type) {
   return tools_[GetToolTypeForSourceType(type)].get();
 }
@@ skipping 20 matching lines @@
       return TYPE_STAMP;
     default:
       NOTREACHED();
       return Toolchain::TYPE_NONE;
   }
 }
 
 const Tool* Toolchain::GetToolForTargetFinalOutput(const Target* target) const {
   return tools_[GetToolTypeForTargetFinalOutput(target)].get();
 }