[Ravenwood] Internal clean up, more PFD APIs, OsConstants, etc

- Support a few more ParcelFileDescriptor APIs.
- Support OsConstants and a couple of Os APIs.

- Also clean up f/b/ravenwood. Now we have "runtime-common" library
  that can be used from different components of Ravenwood infra,
  with native code support.

Bug: 292141694
Test: $ANDROID_BUILD_TOP/frameworks/base/ravenwood/scripts/run-ravenwood-tests.sh
Test: CtsOsTestCases (on tree hugger)
Flag: EXEMPT hostside test change only
Change-Id: I259a04201e05e615e17da0529cb500a102887ec9

1 files changed, 29 insertions, 0 deletions

diff --git a/ravenwood/runtime-common-ravenwood-src/com/android/ravenwood/common/divergence/RavenwoodDivergence.java b/ravenwood/runtime-common-ravenwood-src/com/android/ravenwood/common/divergence/RavenwoodDivergence.java
new file mode 100644
index 000000000000..59f474a39033
--- /dev/null
+++ b/ravenwood/runtime-common-ravenwood-src/com/android/ravenwood/common/divergence/RavenwoodDivergence.java
@@ -0,0 +1,29 @@
+/*
+ * Copyright (C) 2024 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.
+ */
+package com.android.ravenwood.common.divergence;
+
+/**
+ * A class that behaves differently on the device side and on Ravenwood, because we have
+ * two build modules with different implementation and we link the different ones at runtime.
+ */
+public final class RavenwoodDivergence {
+    private RavenwoodDivergence() {
+    }
+
+    public static boolean isOnRavenwood() {
+        return true;
+    }
+}