Bug 1729580 - Remove unused `layers.***` pref more. r=gfx-reviewers,lsalzman

Differential Revision: https://phabricator.services.mozilla.com/D124866

mobile/android/app/mobile.js

@@ -390,12 +390,6 @@ pref("apz.touch_move_tolerance", "0.03");
 pref("apz.touch_start_tolerance", "0.06");
 
 pref("layers.low-precision-buffer", true);
-// We want to limit layers for two reasons:
-// 1) We can't scroll smoothly if we have to many draw calls
-// 2) Pages that have too many layers consume too much memory and crash.
-// By limiting the number of layers on mobile we're making the main thread
-// work harder keep scrolling smooth and memory low.
-pref("layers.max-active", 20);
 
 pref("notification.feature.enabled", true);
 

modules/libpref/init/StaticPrefList.yaml

@@ -6387,16 +6387,6 @@
   value: false
   mirror: always
 
-- name: layers.compositing-tiles.width
-  type: RelaxedAtomicInt32
-  value: 1024
-  mirror: always
-
-- name: layers.compositing-tiles.height
-  type: RelaxedAtomicInt32
-  value: 1024
-  mirror: always
-
 # 0 is "no change" for contrast, positive values increase it, negative values
 # decrease it until we hit mid gray at -1 contrast, after that it gets weird.
 - name: layers.effect.contrast
@@ -6545,23 +6535,11 @@
   value: false
   mirror: always
 
-- name: layers.low-precision-opacity
-  type: AtomicFloat
-  value: 1.0f
-  mirror: always
-
 - name: layers.low-precision-resolution
   type: AtomicFloat
   value: 0.25f
   mirror: always
 
-# Max number of layers per container. See Overwrite in mobile prefs.
-- name: layers.max-active
-  type: RelaxedAtomicInt32
-  value: -1
-  mirror: always
-
-
 # Whether to animate simple opacity and transforms on the compositor.
 - name: layers.offmainthreadcomposition.async-animations
   type: bool
@@ -6588,11 +6566,6 @@
   value: -1
   mirror: always
 
-- name: layers.orientation.sync.timeout
-  type: RelaxedAtomicUint32
-  value: (uint32_t)0
-  mirror: always
-
 #ifdef XP_WIN
 -   name: layers.prefer-opengl
     type: bool
@@ -6630,36 +6603,6 @@
   value: true
   mirror: once
 
-- name: layers.tiles.edge-padding
-  type: bool
-  value: @IS_ANDROID@
-  mirror: once
-
-- name: layers.tiles.fade-in.enabled
-  type: RelaxedAtomicBool
-  value: false
-  mirror: always
-
-- name: layers.tiles.fade-in.duration-ms
-  type: RelaxedAtomicUint32
-  value: 250
-  mirror: always
-
-- name: layers.tiles.retain-back-buffer
-  type: RelaxedAtomicBool
-  value: true
-  mirror: always
-
-- name: layers.transaction.warning-ms
-  type: RelaxedAtomicUint32
-  value: 200
-  mirror: always
-
-- name: layers.uniformity-info
-  type: bool
-  value: false
-  mirror: once
-
 - name: layers.recycle-allocator-rdd
   type: bool
   value: true