history: support some customizer styles (#1698)

Author: shakyShane

special-pages/pages/history/app/history.md

@@ -33,9 +33,11 @@ With {@link "History Messages".DefaultStyles} overrides
   "platform": {
     "name": "macos"
   },
-  "defaultStyles": {
-    "lightBackgroundColor": "#E9EBEC",
-    "darkBackgroundColor": "#27282A"
+  "customizer": {
+    "defaultStyles": {
+      "lightBackgroundColor": "#E9EBEC",
+      "darkBackgroundColor": "#27282A"
+    }
   }
 }
 ```

special-pages/pages/history/app/index.js

@@ -60,7 +60,7 @@ export async function init(root, messaging, baseEnvironment) {
     };
 
     // apply default styles
-    applyDefaultStyles(init.defaultStyles);
+    applyDefaultStyles(init.customizer?.defaultStyles);
 
     const strings = await getStrings(environment);
     const service = new HistoryService(messaging);

special-pages/pages/history/app/mocks/mock-transport.js

@@ -157,7 +157,9 @@ export function mockTransport() {
                         platform: { name: 'integration' },
                         env: 'development',
                         locale: 'en',
-                        defaultStyles: getDefaultStyles(),
+                        customizer: {
+                            defaultStyles: getDefaultStyles(),
+                        },
                     };
 
                     return Promise.resolve(initial);

special-pages/pages/history/messages/initialSetup.response.json

@@ -20,15 +20,20 @@
         }
       }
     },
-    "defaultStyles": {
-      "oneOf": [
-        {
-          "type": "null"
-        },
-        {
-          "$ref": "types/default-styles.json"
+    "customizer": {
+      "type": "object",
+      "properties": {
+        "defaultStyles": {
+          "oneOf": [
+            {
+              "type": "null"
+            },
+            {
+              "$ref": "../../new-tab/messages/types/default-styles.json"
+            }
+          ]
         }
-      ]
+      }
     }
   }
 }

special-pages/pages/history/types/history.ts

@@ -196,7 +196,9 @@ export interface InitialSetupResponse {
   platform: {
     name: "macos" | "windows" | "android" | "ios" | "integration";
   };
-  defaultStyles?: null | DefaultStyles;
+  customizer?: {
+    defaultStyles?: null | DefaultStyles;
+  };
 }
 export interface DefaultStyles {
   /**