Support explicit pools in actions

tools/gn/builder.cc

Index: tools/gn/builder.cc
diff --git a/tools/gn/builder.cc b/tools/gn/builder.cc
index bb3f834f6cb21970950f89cae1ae2821832e7556..16dab6eca1f1ddd395e32599a6ce4ac6586d3d77 100644
--- a/tools/gn/builder.cc
+++ b/tools/gn/builder.cc
@@ -7,6 +7,7 @@
 #include <stddef.h>
 #include <utility>
 
+#include "tools/gn/action_values.h"
 #include "tools/gn/config.h"
 #include "tools/gn/deps_iterator.h"
 #include "tools/gn/err.h"
@@ -439,6 +440,7 @@ bool Builder::ResolveItem(BuilderRecord* record, Err* err) {
         !ResolveConfigs(&target->configs(), err) ||
         !ResolveConfigs(&target->all_dependent_configs(), err) ||
         !ResolveConfigs(&target->public_configs(), err) ||
+        !ResolveActionValues(&target->action_values(), err) ||
         !ResolveToolchain(target, err))
       return false;
   } else if (record->type() == BuilderRecord::ITEM_CONFIG) {
@@ -519,6 +521,20 @@ bool Builder::ResolveToolchain(Target* target, Err* err) {
   return true;
 }
 
+bool Builder::ResolveActionValues(ActionValues* action_values, Err* err) {
+  if (action_values->pool().label.is_null())
+    return true;
+
+  BuilderRecord* record = GetResolvedRecordOfType(
+      action_values->pool().label, action_values->pool().origin,
+      BuilderRecord::ITEM_POOL, err);
+  if (!record)
+    return false;
+  action_values->set_pool(LabelPtrPair<Pool>(record->item()->AsPool()));
+
+  return true;
+}
+
 bool Builder::ResolvePools(Toolchain* toolchain, Err* err) {
   for (int i = Toolchain::TYPE_NONE + 1; i < Toolchain::TYPE_NUMTYPES; i++) {
     Toolchain::ToolType tool_type = static_cast<Toolchain::ToolType>(i);