Bug 1722055 - Rename gfx.webrender.force-disabled. r=aosmond

Change the pref name in anticipation of removing it completely
to see what the fallout will be.

Differential Revision: https://phabricator.services.mozilla.com/D120735

gfx/config/gfxConfigManager.cpp

@@ -30,7 +30,7 @@ void gfxConfigManager::Init() {
 
   EmplaceUserPref("gfx.webrender.compositor", mWrCompositorEnabled);
   mWrForceEnabled = gfxPlatform::WebRenderPrefEnabled();
-  mWrForceDisabled = StaticPrefs::gfx_webrender_force_disabled_AtStartup();
+  mWrForceDisabled = StaticPrefs::gfx_webrender_force_legacy_layers_AtStartup();
   mWrSoftwareForceEnabled = StaticPrefs::gfx_webrender_software_AtStartup();
   mWrCompositorForceEnabled =
       StaticPrefs::gfx_webrender_compositor_force_enabled_AtStartup();

modules/libpref/init/StaticPrefList.yaml

@@ -5024,7 +5024,7 @@
 # Also expose a pref to allow users to force-disable WR. This is exposed
 # on all channels because WR can be enabled on qualified hardware on all
 # channels.
-- name: gfx.webrender.force-disabled
+- name: gfx.webrender.force-legacy-layers
   type: bool
   value: false
   mirror: once

toolkit/components/gfx/SanityTest.jsm

@@ -27,7 +27,7 @@ const DISABLE_VIDEO_PREF = "media.hardware-video-decoding.failed";
 const RUNNING_PREF = "sanity-test.running";
 const TIMEOUT_SEC = 20;
 
-const WR_DISABLED_PREF = "gfx.webrender.force-disabled";
+const WR_DISABLED_PREF = "gfx.webrender.force-legacy-layers";
 
 // GRAPHICS_SANITY_TEST histogram enumeration values
 const TEST_PASSED = 0;

toolkit/components/telemetry/app/TelemetryEnvironment.jsm

@@ -289,7 +289,7 @@ const DEFAULT_ENVIRONMENT_PREFS = new Map([
   ["gfx.direct2d.force-enabled", { what: RECORD_PREF_VALUE }],
   ["gfx.webrender.all", { what: RECORD_PREF_VALUE }],
   ["gfx.webrender.all.qualified", { what: RECORD_PREF_VALUE }],
-  ["gfx.webrender.force-disabled", { what: RECORD_PREF_VALUE }],
+  ["gfx.webrender.force-legacy-layers", { what: RECORD_PREF_VALUE }],
   ["layers.acceleration.disabled", { what: RECORD_PREF_VALUE }],
   ["layers.acceleration.force-enabled", { what: RECORD_PREF_VALUE }],
   ["layers.async-pan-zoom.enabled", { what: RECORD_PREF_VALUE }],