compatibility for chrome extension content script

[shadowsong91]

This PR contains a:

• [ ] bugfix
• [x] new feature
• [ ] code refactor
• [ ] test update
• [ ] typo fix
• [ ] metadata update

Motivation / Use-Case

When developing chrome extension, request urls for files will be like chrome-extension://${extension_id}/file, not http. These urls can be generated by calling chrome.runtime.getURL.

Breaking Changes

1. Add useInChromeExtensionContentScript in options.
2. When useInChromeExtensionContentScript === true, wrap publicPath with chrome.runtime.getURL.

Additional Info

[jsf-clabot]

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[codecov[bot]]

Codecov Report

Merging #373 into master will decrease coverage by 3.22%. The diff coverage is 50.00%.

@@             Coverage Diff             @@
##            master     #373      +/-   ##
===========================================
- Coverage   100.00%   96.77%   -3.23%     
===========================================
  Files            2        2              
  Lines           29       31       +2     
  Branches        12       13       +1     
===========================================
+ Hits            29       30       +1     
- Misses           0        1       +1     

Impacted Files	Coverage Δ
src/index.js	96.42% <50.00%> (-3.58%)	:arrow_down:

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