Bug 1575983 - Remove duplicate gl.* and image.* prefs r=njn

Removes all duplicate gl.* prefs and 5 duplicate image.* prefs from all.js. Replaces default values in StaticPrefList.yaml with their all.js counterparts where needed. Imports comments from all.js.

Differential Revision: https://phabricator.services.mozilla.com/D44558

--HG--
extra : moz-landing-system : lando

modules/libpref/init/StaticPrefList.yaml

@@ -3568,7 +3568,7 @@
 #if defined(XP_MACOSX)
 -   name: gl.multithreaded
     type: RelaxedAtomicBool
-    value: false
+    value: true
     mirror: always
 #endif
 
@@ -3608,7 +3608,7 @@
   mirror: always
 
 #---------------------------------------------------------------------------
-# Prefs starting with "image."
+# Prefs starting with "idle_period."
 #---------------------------------------------------------------------------
 
 - name: idle_period.min
@@ -3714,11 +3714,14 @@
   value: false
   mirror: always
 
+# Enable extra information for debugging in the image memory reports.
 - name: image.mem.debug-reporting
   type: RelaxedAtomicBool
   value: false
   mirror: always
 
+# Decodes images into shared memory to allow direct use in separate
+# rendering processes. Only applicable with WebRender.
 - name: image.mem.shared
   type: RelaxedAtomicBool
   value: true
@@ -3757,9 +3760,15 @@
   value: 4
   mirror: once
 
+# Minimum buffer size in KB before using volatile memory over the heap.
 - name: image.mem.volatile.min_threshold_kb
   type: RelaxedAtomicInt32
+#if defined(ANDROID)
+  # On Android, volatile memory keeps file handles open for each buffer.
+  value: 100
+#else
   value: -1
+#endif
   mirror: always
 
 # How long in ms before we should start shutting down idle decoder threads.
@@ -3775,9 +3784,10 @@
   value: -1
   mirror: once
 
+# Whether we attempt to decode WebP images or not.
 - name: image.webp.enabled
   type: RelaxedAtomicBool
-  value: false
+  value: true
   mirror: always
 
 #---------------------------------------------------------------------------

modules/libpref/init/all.js

@@ -4192,36 +4192,9 @@ pref("image.mem.discardable", true);
   pref("image.mem.animated.use_heap", false);
 #endif
 
-// Enable extra information for debugging in the image memory reports.
-pref("image.mem.debug-reporting", false);
-
-// Decodes images into shared memory to allow direct use in separate
-// rendering processes. Only applicable with WebRender.
-pref("image.mem.shared", true);
-
 // Allows image locking of decoded image data in content processes.
 pref("image.mem.allow_locking_in_content_processes", true);
 
-// What is the minimum buffer size in KB before using volatile memory over the
-// heap. On Android, volatile memory keeps file handles open for each buffer.
-#if defined(ANDROID)
-  pref("image.mem.volatile.min_threshold_kb", 100);
-#else
-  pref("image.mem.volatile.min_threshold_kb", -1);
-#endif
-
-// Whether we attempt to decode WebP images or not.
-pref("image.webp.enabled", true);
-
-// WebGL prefs
-pref("gl.require-hardware", false);
-#ifdef XP_MACOSX
-  pref("gl.multithreaded", true);
-#endif
-pref("gl.ignore-dx-interop2-blacklist", false);
-pref("gl.use-tls-is-current", 0);
-pref("gl.allow-high-power", true);
-
 #ifdef XP_MACOSX
   pref("webgl.1.allow-core-profiles", true);
 #else