Import protobuf-codegen-2.14.0

* Add OWNERS, Android.bp, and README.android.
* Hard code version number in src/lib.rs for now.
  It could be in a smarter update_package.sh to get the
  new version number from Cargo.tom. But until then,
  the difference in lib.rs will be caught and fixed manually.
* Rename protoc_gen_rust to protoc-gen-rust for aprotoc plugin.

Bug: 143953733
Test: make
Change-Id: I9b3c3b9f2e7ad0eb203c26534f2b6ba5fac46eef

Android.bp

diff --git a/Android.bp b/Android.bp
new file mode 100644
index 0000000..2d4ef0a
--- /dev/null
+++ b/Android.bp
@@ -0,0 +1,38 @@
+// This file is generated by cargo2android.py --run --dependencies.
+
+// Rename protoc_gen_rust to protoc-gen-rust for aprotoc plugin.
+
+rust_library_host_rlib {
+    name: "libprotobuf_codegen",
+    crate_name: "protobuf_codegen",
+    srcs: ["src/lib.rs"],
+    edition: "2015",
+    rlibs: [
+        "libprotobuf",
+    ],
+}
+
+// rust_binary_host {
+//     name: "protobuf_bin_gen_rust_do_not_use",
+//     crate_name: "protobuf_bin_gen_rust_do_not_use",
+//     srcs: ["src/bin/protobuf-bin-gen-rust-do-not-use.rs"],
+//     edition: "2015",
+//     rlibs: [
+//         "libprotobuf",
+//         "libprotobuf_codegen",
+//     ],
+// }
+
+rust_binary_host {
+    name: "protoc-gen-rust",
+    crate_name: "protoc_gen_rust",
+    srcs: ["src/bin/protoc-gen-rust.rs"],
+    edition: "2015",
+    rlibs: [
+        "libprotobuf",
+        "libprotobuf_codegen",
+    ],
+}
+
+// dependent_library ["feature_list"]
+//   protobuf-2.14.0