tombstoned: Improve message on java trace completion.

For java traces, log the kind of dump as well as the PID of the
completed dump. This makes it easier to correlate dump requests with the
actual file they're written to.

Sample log statement:
E /system/bin/tombstoned: Traces for pid 4737 written to: /data/anr/trace_00

The message for native traces / tombstones remains unchanged because
several tools parse it.

Test: manual
Bug: 32064548

Change-Id: I7b3792dd5ae312ee0bc055c22ec3f7c747152072
diff --git a/debuggerd/tombstoned/tombstoned.cpp b/debuggerd/tombstoned/tombstoned.cpp
index b920ebc..355898d 100644
--- a/debuggerd/tombstoned/tombstoned.cpp
+++ b/debuggerd/tombstoned/tombstoned.cpp
@@ -345,7 +345,14 @@
   }
 
   if (!crash->crash_path.empty()) {
-    LOG(ERROR) << "Tombstone written to: " << crash->crash_path;
+    if (crash->crash_type == kDebuggerdJavaBacktrace) {
+      LOG(ERROR) << "Traces for pid " << crash->crash_pid << " written to: " << crash->crash_path;
+    } else {
+      // NOTE: Several tools parse this log message to figure out where the
+      // tombstone associated with a given native crash was written. Any changes
+      // to this message must be carefully considered.
+      LOG(ERROR) << "Tombstone written to: " << crash->crash_path;
+    }
   }
 
 fail: