And reorganize the branches in get_prim_render_strategy to reduce nesting

Differential Revision: https://phabricator.services.mozilla.com/D203919

[ghsync] From https://hg.mozilla.org/mozilla-central/rev/f89ecc056f703879d05ea5fb90055c2dda7c6955

…ts. r=gw

Differential Revision: https://phabricator.services.mozilla.com/D203421

[ghsync] From https://hg.mozilla.org/mozilla-central/rev/f61047c33e3e32ff7ed2a785b019ef49c785dad6

… bustages CLOSED TREE

[ghsync] From https://hg.mozilla.org/mozilla-central/rev/bf480ef2bdbfed23fd59d0f754f58c5aa93e3ca6

…or Gecko r=jrmuizel

Make glean an optional dependency that is only enabled when building
WebRender for Gecko.

Differential Revision: https://phabricator.services.mozilla.com/D204059

[ghsync] From https://hg.mozilla.org/mozilla-central/rev/10af6b2ff03bd7512d53f3ed02f7e83dba7c57ba

…eviewers,mach-reviewers

Depends on D204347

Differential Revision: https://phabricator.services.mozilla.com/D204348

[ghsync] From https://hg.mozilla.org/mozilla-central/rev/1ca35c868a8a8ebc010501bf4cfb212dae663e01

…ct. r=gfx-reviewers,gw

While investigating why get_surface_rect sometimes returns an empty rect (causing bad render task sizes), I noticed that all users of get_surface_rect use it to size surfaces, rely on the returned rect to be snapped to integer coordinates, and some even round the coordinates a second time. The documentation of the function states that its purpose is to provide a rect suitable for surface allocation. This patch bakes the expectation into the type and removes some redundant operations.

Differential Revision: https://phabricator.services.mozilla.com/D203738

[ghsync] From https://hg.mozilla.org/mozilla-central/rev/eae4f8752721b2e1361c4c1ea57e038a01e557ea

…ace_rect. r=gfx-reviewers,gw

Differential Revision: https://phabricator.services.mozilla.com/D203912

[ghsync] From https://hg.mozilla.org/mozilla-central/rev/4effb464f6046bf35abd5e2fdc7edf49312acedc

…zed rect. r=gw

Differential Revision: https://phabricator.services.mozilla.com/D204198

[ghsync] From https://hg.mozilla.org/mozilla-central/rev/dd1b3d97c6a88101781dd141b8c9b5ad3949a413

…rect. r=gw

Differential Revision: https://phabricator.services.mozilla.com/D204228

[ghsync] From https://hg.mozilla.org/mozilla-central/rev/987284103c26599be1cfe7738d0780c6253fb5cb

…ausing webrender bustages in conftest.c CLOSED TREE

Backed out changeset 987284103c26 (bug 1769492)
Backed out changeset dd1b3d97c6a8 (bug 1769492)
Backed out changeset 4effb464f604 (bug 1883863)
Backed out changeset eae4f8752721 (bug 1883873)

[ghsync] From https://hg.mozilla.org/mozilla-central/rev/d9ad55d66d8523561815b7fbeef13f84428eb55b

The vClipRadii varying being changed to mediump is causing borders to
be clipped incorrectly at certain zoom levels. This patch reverts it
to highp to avoid the issue.

As a precaution it conservatively reverts several other varyings in
this shader to be highp as well. Although the others are not
responsible for the issue reported in this bug, using mediump for
varyings related to positioning could cause similar problems.

Differential Revision: https://phabricator.services.mozilla.com/D204507

[ghsync] From https://hg.mozilla.org/mozilla-central/rev/7afa472a8cac8d854d0d9c68a3c18a590978fffe

…ct. r=gfx-reviewers,gw

While investigating why get_surface_rect sometimes returns an empty rect (causing bad render task sizes), I noticed that all users of get_surface_rect use it to size surfaces, rely on the returned rect to be snapped to integer coordinates, and some even round the coordinates a second time. The documentation of the function states that its purpose is to provide a rect suitable for surface allocation. This patch bakes the expectation into the type and removes some redundant operations.

Differential Revision: https://phabricator.services.mozilla.com/D203738

[ghsync] From https://hg.mozilla.org/mozilla-central/rev/038ff8035b29b9052311d9cf616a2aced886896c

…ace_rect. r=gfx-reviewers,gw

Differential Revision: https://phabricator.services.mozilla.com/D203912

[ghsync] From https://hg.mozilla.org/mozilla-central/rev/38cbac05cbe6c61198346214bfb7a993133394e9

…zed rect. r=gw

Differential Revision: https://phabricator.services.mozilla.com/D204198

[ghsync] From https://hg.mozilla.org/mozilla-central/rev/f7eaa2650ed500ccfd3df27f4733087722b9b412

…rect. r=gw

Differential Revision: https://phabricator.services.mozilla.com/D204228

[ghsync] From https://hg.mozilla.org/mozilla-central/rev/841e7dd0db80a53d9937286637f15cb2579eb9c4

Webrender's glslopt-optimized shaders encounter a miscompilation on
some Adreno driver versions regarding fetching empty clip tasks. This
patch reshuffles the code in such a way as to avoid the
bug. Unfortunately the specific cause of the miscompilation remains
unknown, meaning we must take extra care not to regress it in the
future.

Differential Revision: https://phabricator.services.mozilla.com/D204864

[ghsync] From https://hg.mozilla.org/mozilla-central/rev/488c57bb8ceed6da3f0be935156a480cdb92bc32