GN: Add notion of 'complete' static libraries, akin to GYP.

tools/gn/binary_target_generator.cc

Index: tools/gn/binary_target_generator.cc
diff --git a/tools/gn/binary_target_generator.cc b/tools/gn/binary_target_generator.cc
index b11a529dc0ff0a6baf570c00133a98e3d3d7ab10..16dadb2e656dad388e746607fb4653beb83eef32 100644
--- a/tools/gn/binary_target_generator.cc
+++ b/tools/gn/binary_target_generator.cc
@@ -59,6 +59,10 @@ void BinaryTargetGenerator::DoRun() {
   if (err_->has_error())
     return;
 
+  FillCompleteStaticLib();
+  if (err_->has_error())
+    return;
+
   // Config values (compiler flags, etc.) set directly on this target.
   ConfigValuesGenerator gen(&target_->config_values(), scope_,
                             scope_->GetSourceDir(), err_);
@@ -76,6 +80,17 @@ void BinaryTargetGenerator::FillCheckIncludes() {
   target_->set_check_includes(value->boolean_value());
 }
 
+void BinaryTargetGenerator::FillCompleteStaticLib() {
+  if (target_->output_type() == Target::STATIC_LIBRARY) {
+    const Value* value = scope_->GetValue(variables::kCompleteStaticLib, true);
+    if (!value)
+      return;
+    if (!value->VerifyTypeIs(Value::BOOLEAN, err_))
+      return;
+    target_->set_complete_static_lib(value->boolean_value());
+  }
+}
+
 void BinaryTargetGenerator::FillOutputName() {
   const Value* value = scope_->GetValue(variables::kOutputName, true);
   if (!value)