Upstream: Add WebAPK's client library.

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

Index: chrome/android/webapk/libs/runtime_library/BUILD.gn
diff --git a/third_party/haha/BUILD.gn b/chrome/android/webapk/libs/runtime_library/BUILD.gn
similarity index 51%
copy from third_party/haha/BUILD.gn
copy to chrome/android/webapk/libs/runtime_library/BUILD.gn
index 6e7a2626e4f6b8d130d775c4a7c6c9d0d7bd8a50..02b53a665a3b293ae908b0457fbf633a94ed07ed 100644
--- a/third_party/haha/BUILD.gn
+++ b/chrome/android/webapk/libs/runtime_library/BUILD.gn
@@ -4,6 +4,9 @@
 
 import("//build/config/android/rules.gni")
 
-android_java_prebuilt("haha") {
-  jar_path = "haha-2.0.2.jar"
+android_aidl("webapk_service_aidl") {
+  interface_file = "src/org/chromium/webapk/lib/runtime_library/common.aidl"
+  sources = [
+    "src/org/chromium/webapk/lib/runtime_library/IWebApkApi.aidl",
+  ]
 }