Add chrome_proxy.exe target for bookmark app shortcuts to target on Windows

This change adds a new executable to Windows called chrome_proxy.exe which
opens chrome.exe with all arguments forwarded.

The purpose of the executable is for bookmark app shortcuts to target so
they don't pick up the chrome.VisualElementsManifest.xml file when pinned
to the Windows 10 start menu. This fixes a bug where pinned bookmark app
shortcuts all use the Chrome logo instead of their own.

Bug: 732357
Change-Id: I6f4385219329e6d6e446053fc1325082ce4328c6
Reviewed-on: https://chromium-review.googlesource.com/c/1335075
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Greg Thompson <grt@chromium.org>
Commit-Queue: Alan Cutter <alancutter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612477}
24 files changed