Upstream: Version WebAPK runtime library

chrome/android/webapk/libs/runtime_library/BUILD.gn

Index: chrome/android/webapk/libs/runtime_library/BUILD.gn
diff --git a/chrome/android/webapk/libs/runtime_library/BUILD.gn b/chrome/android/webapk/libs/runtime_library/BUILD.gn
index 62d89ebbeb73f7256c5d19281ecc749a0828a95b..3d497f285d2246779d683549d14a24aed25f1a3e 100644
--- a/chrome/android/webapk/libs/runtime_library/BUILD.gn
+++ b/chrome/android/webapk/libs/runtime_library/BUILD.gn
@@ -3,6 +3,15 @@
 # found in the LICENSE file.
 
 import("//build/config/android/rules.gni")
+import("//chrome/android/webapk/libs/runtime_library_version.gni")
+
+# runtime_library_version.gni must be updated whenever the runtime library is
+# updated. The WebAPK re-extracts the runtime library from the Chrome APK when
+# |runtime_library_version| is incremented.
+
+# Whenever this constant is changed, WebApkUtils#getRuntimeDexName() must also
+# be changed.
+runtime_library_dex_asset_name = "webapk$runtime_library_version.dex"
 
 android_aidl("webapk_service_aidl") {
   import_include = "src/org/chromium/webapk/lib/runtime_library"
@@ -13,15 +22,18 @@ android_aidl("webapk_service_aidl") {
 }
 
 android_library("runtime_library") {
-  dex_path = "$target_gen_dir/web_apk.dex"
+  dex_path = "$target_gen_dir/$runtime_library_dex_asset_name"
   java_files =
       [ "src/org/chromium/webapk/lib/runtime_library/WebApkServiceImpl.java" ]
   srcjar_deps = [ ":webapk_service_aidl" ]
 }
 
 android_assets("runtime_library_assets") {
+  write_file("$target_gen_dir/webapk_dex_version.txt", runtime_library_version)
+
   sources = [
-    "$target_gen_dir/web_apk.dex",
+    "$target_gen_dir/$runtime_library_dex_asset_name",
+    "$target_gen_dir/webapk_dex_version.txt",
   ]
   disable_compression = true