Support explicit pools in actions

tools/gn/toolchain.h

 // 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.
 
 #ifndef TOOLS_GN_TOOLCHAIN_H_
 #define TOOLS_GN_TOOLCHAIN_H_
 
 #include <memory>
 
 #include "base/logging.h"
@@ skipping 29 matching lines @@
     TYPE_RC,
     TYPE_ASM,
     TYPE_ALINK,
     TYPE_SOLINK,
     TYPE_SOLINK_MODULE,
     TYPE_LINK,
     TYPE_STAMP,
     TYPE_COPY,
     TYPE_COPY_BUNDLE_DATA,
     TYPE_COMPILE_XCASSETS,
+    TYPE_ACTION,
 
     TYPE_NUMTYPES  // Must be last.
   };
 
   static const char* kToolCc;
   static const char* kToolCxx;
   static const char* kToolObjC;
   static const char* kToolObjCxx;
   static const char* kToolRc;
   static const char* kToolAsm;
   static const char* kToolAlink;
   static const char* kToolSolink;
   static const char* kToolSolinkModule;
   static const char* kToolLink;
   static const char* kToolStamp;
   static const char* kToolCopy;
   static const char* kToolCopyBundleData;
   static const char* kToolCompileXCAssets;
+  static const char* kToolAction;
 
   // The Settings of an Item is always the context in which the Item was
   // defined. For a toolchain this is confusing because this is NOT the
   // settings object that applies to the things in the toolchain.
   //
   // To get the Settings object corresponding to objects loaded in the context
   // of this toolchain (probably what you want instead), see
   // Loader::GetToolchainSettings(). Many toolchain objects may be created in a
   // given build, but only a few might be used, and the Loader is in charge of
   // this process.
@@ skipping 52 matching lines @@
   bool setup_complete_;
 
   // Substitutions used by the tools in this toolchain.
   SubstitutionBits substitution_bits_;
 
   LabelTargetVector deps_;
   Scope::KeyValueMap args_;
 };
 
 #endif  // TOOLS_GN_TOOLCHAIN_H_