Add a system variant of the merged annotations

This is going to be disted instead of the monolithic one being
used currently.

Bug: 235140934
Test: m sdk-annotations{,-system}.zip and diff; manual spot checking
Test: m sdk dist && diff out/dist/system-data/annotations.zip with this
Change-Id: I9874f88e933a8b804a73638e6bac7a9d312c7c9f

api/Android.bp

@@ -190,12 +190,8 @@ genrule {
 
 // This produces the same annotations.zip as framework-doc-stubs, but by using
 // outputs from individual modules instead of all the source code.
-genrule {
-    name: "sdk-annotations.zip",
-    srcs: [
-        ":android-non-updatable-doc-stubs{.annotations.zip}",
-        ":all-modules-public-annotations",
-    ],
+genrule_defaults {
+    name: "sdk-annotations-defaults",
     out: ["annotations.zip"],
     tools: [
         "merge_annotation_zips",
@@ -205,6 +201,24 @@ genrule {
         "$(location soong_zip) -o $(out) -C $(genDir)/out -D $(genDir)/out",
 }
 
+genrule {
+    name: "sdk-annotations.zip",
+    defaults: ["sdk-annotations-defaults"],
+    srcs: [
+        ":android-non-updatable-doc-stubs{.annotations.zip}",
+        ":all-modules-public-annotations",
+    ],
+}
+
+genrule {
+    name: "sdk-annotations-system.zip",
+    defaults: ["sdk-annotations-defaults"],
+    srcs: [
+        ":android-non-updatable-doc-stubs-system{.annotations.zip}",
+        ":all-modules-system-annotations",
+    ],
+}
+
 genrule {
     name: "combined-removed-dex",
     visibility: [

api/api.go

@@ -155,6 +155,13 @@ func createMergedPublicAnnotationsFilegroup(ctx android.LoadHookContext, modules
 	ctx.CreateModule(android.FileGroupFactory, &props)
 }
 
+func createMergedSystemAnnotationsFilegroup(ctx android.LoadHookContext, modules []string) {
+	props := fgProps{}
+	props.Name = proptools.StringPtr("all-modules-system-annotations")
+	props.Srcs = createSrcs(modules, "{.system.annotations.zip}")
+	ctx.CreateModule(android.FileGroupFactory, &props)
+}
+
 func createFilteredApiVersions(ctx android.LoadHookContext, modules []string) {
 	// For the filtered api versions, we prune all APIs except art module's APIs. because
 	// 1) ART apis are available by default to all modules, while other module-to-module deps are
@@ -294,6 +301,7 @@ func (a *CombinedApis) createInternalModules(ctx android.LoadHookContext) {
 	createMergedFrameworkImpl(ctx, bootclasspath)
 
 	createMergedPublicAnnotationsFilegroup(ctx, bootclasspath)
+	createMergedSystemAnnotationsFilegroup(ctx, bootclasspath)
 
 	createFilteredApiVersions(ctx, bootclasspath)