Keystore 2.0: Implement APC service.

This patch implements the Android Protected Confirmation service in
Keystore 2.0. This includes a C++ wrapper around the HIDL confirmationui
interface which will stay a HIDL interface for now.
This patch also includes the new AIDL specification.

This patch lacks death listener registration b/176491050.

Bug: 159341464
Bug: 173546269
Test: None
Change-Id: Ida4af108e86b538ab64d1dea4809cfa3b36f74cd
diff --git a/keystore2/apc_compat/Android.bp b/keystore2/apc_compat/Android.bp
new file mode 100644
index 0000000..405e9b8
--- /dev/null
+++ b/keystore2/apc_compat/Android.bp
@@ -0,0 +1,56 @@
+// Copyright 2020, The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+cc_library {
+    name: "libkeystore2_apc_compat",
+    srcs: [
+        "apc_compat.cpp",
+    ],
+    shared_libs: [
+        "android.hardware.confirmationui@1.0",
+        "libbase",
+        "libhidlbase",
+        "libutils",
+    ],
+}
+
+rust_bindgen {
+    name: "libkeystore2_apc_compat_bindgen",
+    wrapper_src: "apc_compat.hpp",
+    crate_name: "keystore2_apc_compat_bindgen",
+    source_stem: "bindings",
+
+    bindgen_flags: [
+        "--whitelist-function=tryGetUserConfirmationService",
+        "--whitelist-function=promptUserConfirmation",
+        "--whitelist-function=abortUserConfirmation",
+        "--whitelist-function=closeUserConfirmationService",
+        "--whitelist-var=INVALID_SERVICE_HANDLE",
+        "--whitelist-var=APC_COMPAT_.*",
+    ],
+}
+
+rust_library {
+    name: "libkeystore2_apc_compat-rust",
+    crate_name: "keystore2_apc_compat",
+    srcs: [
+        "apc_compat.rs",
+    ],
+    rustlibs: [
+        "libkeystore2_apc_compat_bindgen",
+    ],
+    shared_libs: [
+        "libkeystore2_apc_compat",
+    ],
+}