Linux: Breakpad updates.

breakpad/linux/linux_dumper.h

Index: breakpad/linux/linux_dumper.h
diff --git a/breakpad/linux/linux_dumper.h b/breakpad/linux/linux_dumper.h
index 1e39a6e2282500d3e3807c179df3aac9436b7aea..b6fc58a955a5d563d58b50aeef9d882ac871f616 100644
--- a/breakpad/linux/linux_dumper.h
+++ b/breakpad/linux/linux_dumper.h
@@ -65,6 +65,7 @@ struct ThreadInfo {
 struct MappingInfo {
   uintptr_t start_addr;
   size_t size;
+  size_t offset;  // offset into the backed file.
   char name[NAME_MAX];
 };