Forward descriptions to primary build invocations.

Test: m nothing bp2build json-module-graph queryview soong_docs
Change-Id: Ic64238dc10a90c923cf5559d1bbbc51fd0922e31

bootstrap/bootstrap.go

@@ -692,6 +692,7 @@ func (s *singleton) GenerateBuildActions(ctx blueprint.SingletonContext) {
 			// because the same Ninja file contains instructions to run
 			// soong_build, run bp2build and to generate the JSON module graph.
 			Optional:    true,
+			Description: i.Description,
 		})
 	}
 

bootstrap/config.go

@@ -108,4 +108,5 @@ type PrimaryBuilderInvocation struct {
 	Inputs      []string
 	Outputs     []string
 	Args        []string
+	Description string
 }