Add Android.bp

The Android.bp file is manually written due to:
    1. Binding to Android's existing copy of grpc instead of
       the copy that is bundled within the crate.
    2. The crates customized grpc_wrap.cc file that provides
       additional translation logic.
    3. A lot of bindgen customizations in build.rs.

Test: build
Change-Id: I80ae57aa66702d55f2a5985d52d5705bc21c6de1

1 files changed, 4 insertions, 1 deletions

diff --git a/src/lib.rs b/src/lib.rs
index dc0699c0..bd4e4fa0 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -5,7 +5,10 @@
 #![allow(non_upper_case_globals)]
 #[allow(clippy::all)]
 mod bindings {
-    include!(env!("BINDING_PATH"));
+    //include!(env!("BINDING_PATH"));
+    // ANDROID's build system doesn't support environment variables
+    // so we hardcode the output location of the bindings here.
+    include!(concat!(env!("OUT_DIR"), "/grpc-bindings.rs"));
 }
 mod grpc_wrap;