add [static|shared].apex_available to cc_library

apex_available property can be appended differently per the linkage
type. This will be used to restrict certain libs (e.g.
libc_malloc_debug) to an APEX while allowing them to be statically
linkable from platform for testing purpose.

Test: m (apex_test amended)
Change-Id: I6dec23129c5ac93a3ef06fea28f26f240c0ba410
diff --git a/cc/cc.go b/cc/cc.go
index 9031afe..32d160e 100644
--- a/cc/cc.go
+++ b/cc/cc.go
@@ -2152,6 +2152,16 @@
 	return false
 }
 
+func (c *Module) AvailableFor(what string) bool {
+	if linker, ok := c.linker.(interface {
+		availableFor(string) bool
+	}); ok {
+		return c.ApexModuleBase.AvailableFor(what) || linker.availableFor(what)
+	} else {
+		return c.ApexModuleBase.AvailableFor(what)
+	}
+}
+
 func (c *Module) installable() bool {
 	return c.installer != nil && !c.Properties.PreventInstall && c.IsForPlatform() && c.outputFile.Valid()
 }
diff --git a/cc/library.go b/cc/library.go
index 0fb3c78..80dc76c 100644
--- a/cc/library.go
+++ b/cc/library.go
@@ -131,6 +131,8 @@
 
 	Export_shared_lib_headers []string `android:"arch_variant"`
 	Export_static_lib_headers []string `android:"arch_variant"`
+
+	Apex_available []string `android:"arch_variant"`
 }
 
 type LibraryMutatedProperties struct {
@@ -573,6 +575,8 @@
 
 	// Write LOCAL_ADDITIONAL_DEPENDENCIES for ABI diff
 	androidMkWriteAdditionalDependenciesForSourceAbiDiff(w io.Writer)
+
+	availableFor(string) bool
 }
 
 func (library *libraryDecorator) getLibName(ctx BaseModuleContext) string {
@@ -1134,6 +1138,19 @@
 	return library.MutatedProperties.StubsVersion
 }
 
+func (library *libraryDecorator) availableFor(what string) bool {
+	var list []string
+	if library.static() {
+		list = library.StaticProperties.Static.Apex_available
+	} else if library.shared() {
+		list = library.SharedProperties.Shared.Apex_available
+	}
+	if len(list) == 0 {
+		return false
+	}
+	return android.CheckAvailableForApex(what, list)
+}
+
 var versioningMacroNamesListKey = android.NewOnceKey("versioningMacroNamesList")
 
 func versioningMacroNamesList(config android.Config) *map[string]string {