Add offset to map data.

Also, print the offset in the maps section.

Bug: 20864928
Change-Id: I71f005726e5ef73cf75bbcb8f829fd5127cb9d61
diff --git a/libbacktrace/UnwindMap.cpp b/libbacktrace/UnwindMap.cpp
index 4a4e2f3..879fea5 100644
--- a/libbacktrace/UnwindMap.cpp
+++ b/libbacktrace/UnwindMap.cpp
@@ -51,6 +51,7 @@
 
     map.start = unw_map.start;
     map.end = unw_map.end;
+    map.offset = unw_map.offset;
     map.load_base = unw_map.load_base;
     map.flags = unw_map.flags;
     map.name = unw_map.path;
@@ -92,6 +93,7 @@
 
       map.start = unw_map.start;
       map.end = unw_map.end;
+      map.offset = unw_map.offset;
       map.load_base = unw_map.load_base;
       map.flags = unw_map.flags;
       map.name = unw_map.path;