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The |pem_path_| member of ChromeTestExtensionLoader is currently always
empty and so will be unused. This CL adds a method to set the pem_path
to be used when packing an extension.

Change-Id: I977c29de7f8078d054ee9d8052c7628551356d1b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2332613
Commit-Queue: Jit Yao Yap <jityao@google.com>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#797150}