Add the capability to include an arbitrary data stream within minidumps

This is supplied via a custom field "custom-data-stream"
Review URL: https://breakpad.appspot.com/408002

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@984 4c0a9323-5329-0410-9bdc-e9ce6186880e

src/client/windows/common/ipc_protocol.h

@@ -82,6 +82,11 @@ struct CustomInfoEntry {
   wchar_t value[kValueMaxLength];
 };
 
+struct CustomDataStream {
+  size_t size;
+  u_int8_t stream[1];
+};
+
 // Constants for the protocol between client and the server.
 
 // Tags sent with each message indicating the purpose of