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When building Chrome we require that you have the "Debugging tools for
Windows" feature of the Windows 10 SDK installed. The error messages
when this non-default component is not installed are a bit cryptic. This
adds a more explicit error message.

The new error message looks like this:

>gn gen out\debug
Traceback (most recent call last):
  File "c:/src/chromium4/src/build/vs_toolchain.py", line 448, in <module>
    sys.exit(main())
  File "c:/src/chromium4/src/build/vs_toolchain.py", line 444, in main
    return commands[sys.argv[1]](*sys.argv[2:])
  File "c:/src/chromium4/src/build/vs_toolchain.py", line 309, in CopyDlls
    _CopyDebugger(target_dir, target_cpu)
  File "c:/src/chromium4/src/build/vs_toolchain.py", line 331, in _CopyDebugger
    '10 SDK.' % full_path)
Exception: dbghelp.dll not found in "C:\Program Files (x86)\Windows Kits\10\Debuggers\x86\dbghelp.dll"
You must install the "Debugging Tools for Windows" feature from the Windows 10 SDK.
ERROR at //build/toolchain/win/BUILD.gn:39:3: Script returned non-zero exit code.
  exec_script("../../vs_toolchain.py",
  ^----------
Current dir: c:/src/chromium4/src/out/debug/
Command: C:/src/depot_tools/python276_bin/python.exe -- c:/src/chromium4/src/build/vs_toolchain.py copy_dlls c:/src/chromium4/src/out/debug Debug x86
Returned 1.
See //BUILD.gn:65:1: which caused the file to be included.
group("gn_all") {
^----------------

R=wkorman@chromium.org
BUG=702697

Review-Url: https://codereview.chromium.org/2853083002
Cr-Commit-Position: refs/heads/master@{#468397}