Add implicit inputs to primary builder actions

This is needed so primary builder actions can directly depend on their
glob result files.

Bug: 318434287
Test: rm -rf out && m nothing && m nothing
Change-Id: I5c67ee53c9f18f81c79c0fe13b3338eacaccdbc0

bootstrap/bootstrap.go

@@ -760,6 +760,7 @@ func (s *singleton) GenerateBuildActions(ctx blueprint.SingletonContext) {
 			Rule:      generateBuildNinja,
 			Outputs:   i.Outputs,
 			Inputs:    i.Inputs,
+			Implicits: i.Implicits,
 			OrderOnly: i.OrderOnlyInputs,
 			Args: map[string]string{
 				"builder": primaryBuilderFile,

bootstrap/config.go

@@ -106,6 +106,7 @@ const (
 
 type PrimaryBuilderInvocation struct {
 	Inputs          []string
+	Implicits       []string
 	OrderOnlyInputs []string
 	Outputs         []string
 	Args            []string