Use one mutator for all bp2build conversion.

Each conversion required defining a separate mutator, which will each
operate on _all_ modules and requires each to repeat checks whether the
mutator should operator. Instead, we introduce a single mutator and
modules can define a ConvertWithBp2build to implement bp2build
conversion for that module.

Test: bp2build.sh
Bug: 183079158
Change-Id: I99d4b51f441c2903879092c5b56313d606d4338d

android/register.go

@@ -178,13 +178,7 @@ func (ctx *Context) RegisterForBazelConversion() {
 		t.register(ctx)
 	}
 
-	bp2buildMutatorList := []RegisterMutatorFunc{}
-	for t, f := range bp2buildMutators {
-		ctx.config.bp2buildModuleTypeConfig[t] = true
-		bp2buildMutatorList = append(bp2buildMutatorList, f)
-	}
-
-	RegisterMutatorsForBazelConversion(ctx, bp2buildPreArchMutators, bp2buildMutatorList)
+	RegisterMutatorsForBazelConversion(ctx, bp2buildPreArchMutators)
 }
 
 // Register the pipeline of singletons, module types, and mutators for
@@ -196,15 +190,6 @@ func (ctx *Context) Register() {
 		t.register(ctx)
 	}
 
-	if ctx.config.BazelContext.BazelEnabled() {
-		// Hydrate the configuration of bp2build-enabled module types. This is
-		// required as a signal to identify which modules should be deferred to
-		// Bazel in mixed builds, if it is enabled.
-		for t, _ := range bp2buildMutators {
-			ctx.config.bp2buildModuleTypeConfig[t] = true
-		}
-	}
-
 	mutators := collateGloballyRegisteredMutators()
 	mutators.registerAll(ctx)