1181678 - Allow mochitests to accurately determine if APZ is enabled

Status: RESOLVED FIXED

(Core :: Panning and Zooming, defect)

Description

[Botond Ballo [:botond]]

Some mochitests, such as test_layerization [1], rely on APZ being enabled.

Currently they check for this by checking the layers.async-pan-zoom.enabled pref directly [2].

However, this isn't completely accurate, because inside Gecko, the things they rely on are actually conditioned on gfxPlatform::AsyncPanZoomEnabled(), which on some platforms additionally checks for e10s being enabled.

To solve this, we should expose gfxPlatform::AsyncPanZoomEnabled() to mochitests (e.g. via nsIDOMWindowUtils), and check for that instead.

[1] http://mxr.mozilla.org/mozilla-central/source/gfx/layers/apz/test/test_layerization.html?rev=148e25920467
[2] http://mxr.mozilla.org/mozilla-central/source/gfx/layers/apz/test/test_layerization.html?force=1#140
[3] http://mxr.mozilla.org/mozilla-central/source/gfx/thebes/gfxPlatform.cpp#2408

Comment 1

[Kartikaya Gupta (email:[e-mail])]

Attachment: Part 1 - Add a DWU function

Comment 2

[Kartikaya Gupta (email:[e-mail])]

Attachment: Part 2 - Update test_layerization

Tested locally on OS X to ensure this works as expected.

Comment 3

[Botond Ballo [:botond]]

Comment on attachment 8631170 [details] [diff] [review]
Part 2 - Update test_layerization

Review of attachment 8631170 [details] [diff] [review]:
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Thanks!

Comment 4

[Pulsebot]

https://hg.mozilla.org/integration/mozilla-inbound/rev/68ca22f61c97
https://hg.mozilla.org/integration/mozilla-inbound/rev/264521d3ef29

Comment 5

[Wes Kocher (:KWierso) (Not reading bugmail; email directly if needed)]

https://hg.mozilla.org/mozilla-central/rev/68ca22f61c97
https://hg.mozilla.org/mozilla-central/rev/264521d3ef29