The overlay was responsible for script loading and defining three elements
(bhTooltip, placesCommands, placesContext). In the majority of places where
the overlay was included only part of it was used. To remove the overlay, the
elements were each split into include files and moved into where they
were used. For the scripts, a JS file was added that defines all the lazy
modules and then this script, globalOverlay.js and utilityOverlay.js were
inlined to everywhere that would have included them from the overlay.
MozReview-Commit-ID: 8T5D46oYWLn
Move the main contents of editBookmarkOverlay.xul into an include file and
inline the DTD and CSS files where used. Convert several chrome tests to
browser tests since the preprocessor is hard to use within the testing
framework.
MozReview-Commit-ID: DpPBOpZSuBN
The overlay elements with children of editMenuOverlay.xul are moved into
include files (editMenuCommands.inc.xul and editMenuKeys.inc.xul). For
the other single elements in the overlay, the attributes are inlined
wherever they are used.
MozReview-Commit-ID: 792cuzUvQxT
There's a lot of overhead to loading scripts from <script> tags in
browser.xul. They're loaded asynchronously, and can't begin loading until
after we begin loading browser.xul. They're loaded using off-main-thread
compilation, which means we need to create and merge a new JS zone for each
script we load that way. They don't benefit from the startup cache at all.
If we load those scripts using the subscript loader, they're loaded from the
preloader cache, and begin loading as early as possible. And they're all
loaded into a single off-thread zone, which means there are less zones to
create and merge. From a quick test, this seems to save about 20-40ms on
Windows ts_paint talos runs.
The main downside is that subscript loader scripts don't benefit from lazy
parsing, so we might wind up increasing memory usage if most of the functions
in those scripts aren't used very often. But we should hopefully be able to
fix that by migrating more browser JS to lazy loading.
MozReview-Commit-ID: Lozb0d0QweC
For now, we return virtually no globals for browser-window/places-overlay/simpletest as they aren't able to load the m-c files. Later we may want to find a way of enabling this to work for outside repositories.
MozReview-Commit-ID: 8SFVuQuEqfL
