Bug 1719688 - Support turning off the webrender compositor for color management. r=mixedpuppy

Differential Revision: https://phabricator.services.mozilla.com/D119431

toolkit/components/extensions/parent/ext-browserSettings.js

@@ -86,6 +86,18 @@ ExtensionPreferencesManager.addSetting("colorManagement.useNativeSRGB", {
   },
 });
 
+ExtensionPreferencesManager.addSetting(
+  "colorManagement.useWebRenderCompositor",
+  {
+    permission: "browserSettings",
+    prefNames: ["gfx.webrender.compositor"],
+
+    setCallback(value) {
+      return { [this.prefNames[0]]: value };
+    },
+  }
+);
+
 ExtensionPreferencesManager.addSetting("contextMenuShowEvent", {
   permission: "browserSettings",
   prefNames: ["ui.context_menus.after_mouseup"],
@@ -488,6 +500,13 @@ this.browserSettings = class extends ExtensionAPI {
               );
             },
           }),
+          useWebRenderCompositor: getSettingsAPI({
+            context,
+            name: "colorManagement.useWebRenderCompositor",
+            callback() {
+              return Services.prefs.getBoolPref("gfx.webrender.compositor");
+            },
+          }),
         },
       },
     };

toolkit/components/extensions/schemas/browser_settings.json

@@ -1,4 +1,4 @@
-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+  // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
@@ -127,6 +127,10 @@
       "useNativeSRGB": {
         "$ref": "types.Setting",
         "description": "This boolean setting controls whether or not native sRGB color management is used."
+      },
+      "useWebRenderCompositor": {
+        "$ref": "types.Setting",
+        "description": "This boolean setting controls whether or not the WebRender compositor is used."
       }
     }
   }

toolkit/components/extensions/test/xpcshell/test_ext_browserSettings.js

@@ -309,6 +309,13 @@ add_task(async function test_browser_settings() {
     "gfx.color_management.native_srgb": true,
   });
 
+  await testSetting("colorManagement.useWebRenderCompositor", false, {
+    "gfx.webrender.compositor": false,
+  });
+  await testSetting("colorManagement.useWebRenderCompositor", true, {
+    "gfx.webrender.compositor": true,
+  });
+
   await extension.unload();
   await promiseShutdownManager();
 });