Make Visual Studio 2017 Community Edition work w/ GYP.
Make Visual Studio 2017 Community Edition work w/ GYP.

Change-Id: I474dcb1c5f6dea03a5b82af62f90b28e9b9cfbb9
Reviewed-on: https://chromium-review.googlesource.com/c/1358041
Reviewed-by: Mark Mentovai <f1b5a91d4d6ad523f2610114591c007e75d15084@chromium.org>

turbulenz/gyp,turbulenz/gyp,chromium/gyp,chromium/gyp,msc-/gyp,turbulenz/gyp,msc-/gyp,msc-/gyp,chromium/gyp,chromium/gyp,chromium/gyp,msc-/gyp,msc-/gyp,turbulenz/gyp,turbulenz/gyp