Add process type to MicroDumpExtraInfo

BUG=616774
R=primiano@chromium.org, torne@chromium.org

Review URL: https://codereview.chromium.org/2087413002 .

src/client/linux/handler/microdump_extra_info.h

@@ -38,9 +38,13 @@ struct MicrodumpExtraInfo {
   const char* build_fingerprint;
   const char* product_info;
   const char* gpu_fingerprint;
+  const char* process_type;
 
   MicrodumpExtraInfo()
-      : build_fingerprint(NULL), product_info(NULL), gpu_fingerprint(NULL) {}
+      : build_fingerprint(NULL),
+        product_info(NULL),
+        gpu_fingerprint(NULL),
+        process_type(NULL) {}
 };
 
 }