Add GN substitution support for Ninja's $in_newline

tools/gn/substitution_type.h

 // 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.
 
 #ifndef TOOLS_GN_SUBSTITUTION_TYPE_H_
 #define TOOLS_GN_SUBSTITUTION_TYPE_H_
 
 #include <vector>
 
 class Err;
@@ skipping 33 matching lines @@
   SUBSTITUTION_CFLAGS,  // {{cflags}}
   SUBSTITUTION_CFLAGS_C,  // {{cflags_c}}
   SUBSTITUTION_CFLAGS_CC,  // {{cflags_cc}}
   SUBSTITUTION_CFLAGS_OBJC,  // {{cflags_objc}}
   SUBSTITUTION_CFLAGS_OBJCC,  // {{cflags_objcc}}
   SUBSTITUTION_DEFINES,  // {{defines}}
   SUBSTITUTION_INCLUDE_DIRS,  // {{include_dirs}}
 
   // Valid for linker tools.
   SUBSTITUTION_LINKER_INPUTS,  // {{inputs}}
+  SUBSTITUTION_LINKER_INPUTS_NEWLINE,  // {{inputs_newline}}
   SUBSTITUTION_LDFLAGS,  // {{ldflags}}
   SUBSTITUTION_LIBS,  // {{libs}}
   SUBSTITUTION_OUTPUT_EXTENSION,  // {{output_extension}}
   SUBSTITUTION_SOLIBS,  // {{solibs}}
 
   SUBSTITUTION_NUM_TYPES  // Must be last.
 };
 
 // An array of size SUBSTITUTION_NUM_TYPES that lists the names of the
 // substitution patterns, including the curly braces. So, for example,
@@ skipping 37 matching lines @@
 bool IsValidCopySubstitution(SubstitutionType type);
 
 // Like the "IsValid..." version above but checks a list of types and sets a
 // an error blaming the given source if the test fails.
 bool EnsureValidSourcesSubstitutions(
     const std::vector<SubstitutionType>& types,
     const ParseNode* origin,
     Err* err);
 
 #endif  // TOOLS_GN_SUBSTITUTION_TYPE_H_