rust: Support new rust_stdlib_prebuilt_host type

Refactor Rust prebuilts to support the new rust_stdlib_prebuilt_host
module type, and change the format for depending on the prebuilt host
stdlibs.

Bug: 140642453
Test: m
Change-Id: Ifbc4741818777934e917631c788b20911856c44a

rust/prebuilt.go

@@ -32,6 +32,8 @@ type PrebuiltProperties struct {
 }
 
 type prebuiltLibraryDecorator struct {
+	android.Prebuilt
+
 	*libraryDecorator
 	Properties PrebuiltProperties
 }
@@ -54,6 +56,13 @@ func PrebuiltRlibFactory() android.Module {
 	return module.Init()
 }
 
+func addSrcSupplier(module android.PrebuiltInterface, prebuilt *prebuiltLibraryDecorator) {
+	srcsSupplier := func(_ android.BaseModuleContext, _ android.Module) []string {
+		return prebuilt.prebuiltSrcs()
+	}
+	android.InitPrebuiltModuleWithSrcSupplier(module, srcsSupplier, "srcs")
+}
+
 func NewPrebuiltLibrary(hod android.HostOrDeviceSupported) (*Module, *prebuiltLibraryDecorator) {
 	module, library := NewRustLibrary(hod)
 	library.BuildOnlyRust()
@@ -62,6 +71,9 @@ func NewPrebuiltLibrary(hod android.HostOrDeviceSupported) (*Module, *prebuiltLi
 		libraryDecorator: library,
 	}
 	module.compiler = prebuilt
+
+	addSrcSupplier(module, prebuilt)
+
 	return module, prebuilt
 }
 
@@ -73,6 +85,9 @@ func NewPrebuiltDylib(hod android.HostOrDeviceSupported) (*Module, *prebuiltLibr
 		libraryDecorator: library,
 	}
 	module.compiler = prebuilt
+
+	addSrcSupplier(module, prebuilt)
+
 	return module, prebuilt
 }
 
@@ -84,6 +99,9 @@ func NewPrebuiltRlib(hod android.HostOrDeviceSupported) (*Module, *prebuiltLibra
 		libraryDecorator: library,
 	}
 	module.compiler = prebuilt
+
+	addSrcSupplier(module, prebuilt)
+
 	return module, prebuilt
 }
 
@@ -130,3 +148,7 @@ func (prebuilt *prebuiltLibraryDecorator) prebuiltSrcs() []string {
 
 	return srcs
 }
+
+func (prebuilt *prebuiltLibraryDecorator) prebuilt() *android.Prebuilt {
+	return &prebuilt.Prebuilt
+}