Initial commit of "HostStubGen" (Ravenwood)

See tools/hoststubgen/README.md for the directory structure...

This CL contains:
- The HostGenTool.

- Libraries to build / run host side tets. (helper-*/ directories)

- Currently we expose ArrayMap and Log to the host side, but we also need to
expose a lot more classes that the tests usee.

- Some sample tests. (test-framework/ and test-tiny-framework/)

Sample tests contain very small tests for ArrayMap and Log.

- This version doen't loa JNI code yet. It still uses the Java substitution
for Log's native methods.

This is because `libandroid_runtime` seems to have a lot of obscure dependencies,
and using `libandroid_runtime` could cause obscure build errors when someone
make chages to any of direct/indirect dependencies.

- Current version doesn't use any Java annotations to control what are exposed
on the host side. Instead, we use `framework-policy-override.txt`, which is
easier to change. (because changing the file wouln't require rebuilding
framework-minus-apex.jar.)

- Currently we expose ArrayMap and Log to the host side, but we also need to
expose a lot more classes that the tests usee. See the `framework-policy-override.txt`
file.

Test: ./scripts/run-all-tests.sh
Bug: 292141694
Change-Id: If149e26aa919d17a0b82dacc78f31bd79fbb110b
diff --git a/tools/hoststubgen/scripts/Android.bp b/tools/hoststubgen/scripts/Android.bp
new file mode 100644
index 0000000..5da805e
--- /dev/null
+++ b/tools/hoststubgen/scripts/Android.bp
@@ -0,0 +1,26 @@
+package {
+    // See: http://go/android-license-faq
+    // A large-scale-change added 'default_applicable_licenses' to import
+    // all of the 'license_kinds' from "frameworks_base_license"
+    // to get the below license kinds:
+    //   SPDX-license-identifier-Apache-2.0
+    default_applicable_licenses: ["frameworks_base_license"],
+}
+
+sh_binary_host {
+    name: "dump-jar",
+    src: "dump-jar",
+    visibility: ["//visibility:public"],
+}
+
+genrule_defaults {
+    name: "hoststubgen-jar-dump-defaults",
+    tools: ["dump-jar"],
+    cmd: "$(location dump-jar) -s -o $(out) $(in)",
+}
+
+sh_binary_host {
+    name: "run-ravenwood-test",
+    src: "run-ravenwood-test",
+    visibility: ["//visibility:public"],
+}