For historical reason, we put our js files, html files and resources
under src/ directory of CCA directory. However, we reference the
resource differently on platform app/SWA.

On platform app, a resource
foo.js is referenced as "chrome-extension://.../js/foo.js".
While on SWA, it is references as: "chrome://.../src/js/foo.js".

We should align the path between two versions of CCA and further replace
the relative path by absolute paths in resource files.
By doing so, we can further support launching CCA (SWA) when typing
random CCA URL in Chrome. (e.g. chrome://camera-app/foo)

NOPRESUBMIT=true

Bug: 980846
Test: cca deploy [DUT]
Test: cca test [DUT]
Test: Both version (Platform app / SWA) works normally
Test: tast run [DUT] camera.CCAUI*
Change-Id: I845fe698ad92ee8da003b2ac3d12519509bdedd4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2434188
Commit-Queue: Wei Lee <wtlee@chromium.org>
Reviewed-by: Inker Kuo <inker@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811569}