Debug stub: improve GDB/MI parser in GDB tests
Debug stub: improve GDB/MI parser in GDB tests

Now the parser returns full dictionary of parsed records, no more missed records, no more broken nesting.

BUG=http://code.google.com/p/nativeclient/issues/detail?id=2764
TEST=run_gdb_stepi_after_break_test run_gdb_print_symbol_test run_gdb_break_continue_thread_test

Review URL: https://chromiumcodereview.appspot.com/10735091

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@9147 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

sbc100/native_client,sbc100/native_client,nacl-webkit/native_client,nacl-webkit/native_client,sbc100/native_client,nacl-webkit/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,nacl-webkit/native_client,nacl-webkit/native_client