Support explicit pools in actions

tools/gn/pool.h

Index: tools/gn/pool.h
diff --git a/tools/gn/pool.h b/tools/gn/pool.h
index 81a021db6593706c25862214e999b4853e479ca7..08da33cee444aaa96c4753f7caf394b837de23fe 100644
--- a/tools/gn/pool.h
+++ b/tools/gn/pool.h
@@ -29,6 +29,10 @@ class Pool : public Item {
   int64_t depth() const { return depth_; }
   void set_depth(int64_t depth) { depth_ = depth; }
 
+  // Console pool option
+  bool is_console() const { return console_; }
+  void set_console(bool value) { console_ = value; }
+
   // The pool name in generated ninja files.
   std::string GetNinjaName(const Label& default_toolchain) const;
 
@@ -36,6 +40,7 @@ class Pool : public Item {
   std::string GetNinjaName(bool include_toolchain) const;
 
   int64_t depth_ = 0;
+  bool console_ = false;
 };
 
 #endif  // TOOLS_GN_POOL_H_