API txt files are dist artifacts

API txt files from a java_sdk_library are automatically registered as
dist artifacts for sdk and win_sdk targets.

They are installed under $(DIST_DIR)/apistubs/<apiscope>/api/<name>.txt
where <apiscope> can be public, system and test.

Bug: 77577799
Test: m -j
Change-Id: I38cd8ee000445ce843ac01ead38001e509228738

java/droiddoc.go

@@ -304,6 +304,12 @@ type Droiddoc struct {
 	checkLastReleasedApiTimestamp android.WritablePath
 
 	annotationsZip android.WritablePath
+
+	apiFilePath android.Path
+}
+
+type ApiFilePath interface {
+	ApiFilePath() android.Path
 }
 
 func InitDroiddocModule(module android.DefaultableModule, hod android.HostOrDeviceSupported) {
@@ -813,6 +819,7 @@ func (d *Droiddoc) GenerateAndroidBuildActions(ctx android.ModuleContext) {
 		args = args + " -api " + d.apiFile.String()
 		metalavaArgs = metalavaArgs + " --api " + d.apiFile.String()
 		implicitOutputs = append(implicitOutputs, d.apiFile)
+		d.apiFilePath = d.apiFile
 	}
 
 	if d.checkCurrentApi() || d.checkLastReleasedApi() || String(d.properties.Removed_api_filename) != "" {
@@ -1091,6 +1098,10 @@ func (d *Droiddoc) GenerateAndroidBuildActions(ctx android.ModuleContext) {
 	}
 }
 
+func (d *Droiddoc) ApiFilePath() android.Path {
+	return d.apiFilePath
+}
+
 var droiddocTemplateTag = dependencyTag{name: "droiddoc-template"}
 
 type DroiddocTemplateProperties struct {