Surface Java APIs Used By APK-only Modules.

Previously we were only generating used-by API-coverage for APEX modules.
This change adds support for APK-only modules such as NetworkStack and DocumentsUI.

Bug: b/216313756
Forrest Run: https://android-build.googleplex.com/builds/abtd/run/L10800000953846781

Test: TARGET_BUILD_VARIANT=userdebug PRODUCT=mainline_modules_x86 ./vendor/google/build/build_unbundled_coverage_mainline_module.sh -j16

Change-Id: Id17e4a55c2a52e9903632a654e778f8d54982dfc
Merged-In: Id17e4a55c2a52e9903632a654e778f8d54982dfc
(cherry picked from commit 56d75785bd)

java/androidmk.go

@@ -423,6 +423,10 @@ func (app *AndroidApp) AndroidMkEntries() []android.AndroidMkEntries {
 					fmt.Fprintf(w, "$(call dist-for-goals,%s,%s:%s)\n",
 						app.installApkName, app.noticeOutputs.HtmlOutput.String(), app.installApkName+"_NOTICE.html")
 				}
+				if app.javaApiUsedByOutputFile.String() != "" {
+					fmt.Fprintf(w, "$(call dist-for-goals,%s,%s:%s/$(notdir %s))\n",
+						app.installApkName, app.javaApiUsedByOutputFile.String(), "java_apis_used_by_apex", app.javaApiUsedByOutputFile.String())
+				}
 			},
 		},
 	}}