Reland protobuf tombstones.

This reverts the following commits:
    e156ede145a7fc671c705d045d89b49922a758b5.
    eda96eddcbdda9632166232b2363c7b84da0994d.
    5ec54d1e843729cd1e38a2f791f001226a653e95.
    1e45d3f2239333217d3252f78151f4294fda4e80.
    a50f61f8fa903117a6df82d164628de310f16ae9.

Test: treehugger
Test: atest -c CtsSeccompHostTestCases:android.seccomp.cts.SeccompHostJUnit4DeviceTest#testAppZygoteSyscalls
Change-Id: Ic2b1f489ac9f1fec7d7a33c845c29891f4306bbd
diff --git a/debuggerd/proto/Android.bp b/debuggerd/proto/Android.bp
new file mode 100644
index 0000000..5307d50
--- /dev/null
+++ b/debuggerd/proto/Android.bp
@@ -0,0 +1,28 @@
+cc_library {
+    name: "libtombstone_proto",
+    cflags: [
+        "-Wall",
+        "-Wextra",
+        "-Wthread-safety",
+        "-Werror",
+    ],
+
+    compile_multilib: "both",
+
+    proto: {
+        export_proto_headers: true,
+        type: "lite",
+    },
+
+    srcs: [
+        "tombstone.proto",
+    ],
+
+    stl: "libc++_static",
+    apex_available: [
+        "com.android.runtime",
+    ],
+
+    recovery_available: true,
+    vendor_ramdisk_available: true,
+}