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When running blink web tests it is important to invoke the wrapper
script (run_isolated_script_test.py) with vpython or else psutil and six
will fail to import.

This change wraps the import of psutil and six in an exception handler
so that a useful error message can be printed. This should make it
easier for users to find the correct solution.

Change-Id: Ia2712e97790d8b54bb9cc640ace37a0fe01ce1c9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2495868
Commit-Queue: Bruce Dawson <brucedawson@chromium.org>
Commit-Queue: John Chen <johnchen@chromium.org>
Auto-Submit: Bruce Dawson <brucedawson@chromium.org>
Reviewed-by: John Chen <johnchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#820453}