Breakpad: Build an x86-64 version of crash_service.exe on Windows

Breakpad: Build an x86-64 version of crash_service.exe on Windows

This is needed for testing Native Client's support for Breakpad on
x86-64.  However, ultimately crash_service is only used for testing
(Google Update's crash reporter is what is used in an installation of
the official Chrome build).

Initially, crash_service.exe will only work on x86-32 processes, and
crash_service64.exe will only work on x86-64 processes.

Eventually we will want to make crash_service64.exe work for both
32-bit and 64-bit processes.

It might not be possible to make crash_service.exe work on 64-bit
processes because Windows' ReadMemory() function only works on 64-bit
target processes if the caller is a 64-bit process.

BUG=89730
TEST=NaCl's run_inbrowser_trusted_crash_in_startup_test

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=95728

[bradn, 2011-08-05 23:53:24]

LGTM

[commit-bot: I haz the power, 2011-08-06 03:28:07]

Change committed as 95728