Various `PageViewport` and `MessageHandler` cleanup#9777

Merged

timvandermeij merged 7 commits intomozilla:masterfrom Snuffleupagus:PageViewport-MessageHandler-cleanup

Jun 4, 2018

+631-623

Commits on Jun 4, 2018

Explicitly list the ignored files in the src/shared/ folder, for the gulp lib build target
Snuffleupagus
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Move PageViewport from src/shared/util.js to src/display/dom_utils.js
Snuffleupagus
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Remove completely unused fontScale property from PageViewport
Snuffleupagus
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Convert the PageViewport to a proper ES6 class
Snuffleupagus
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Update the signature of the PageViewport constructor, and improve the JSDoc comments for the class
Snuffleupagus
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Move MessageHandler into a separate src/shared/message_handler.js file
Snuffleupagus
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Use LoopbackPort in the "message_handler" unit-tests
Snuffleupagus
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