Issue 7253 - Pre-render icons for badge on Chromium

ext/background.js

Index: ext/background.js
===================================================================
--- a/ext/background.js
+++ b/ext/background.js
@@ -343,16 +343,24 @@
           {
             // Edge throws if passed icon sizes different than 19,20,38,40px.
             delete path[16];
             delete path[32];
             return browser.browserAction.setIcon({tabId: this._tabId, path});
           }
         }
 
+        if (change == "iconImageData" && "setIcon" in browser.browserAction)
+        {
+          return browser.browserAction.setIcon({
+            tabId: this._tabId,
+            imageData: this._changes.iconImageData
+          });
+        }
+
         // There is no badge on Firefox for Android; the browser action is
         // simply a menu item.
         if (change == "badgeText" && "setBadgeText" in browser.browserAction)
           return browser.browserAction.setBadgeText({
             tabId: this._tabId,
             text: this._changes.badgeText
           });
 
@@ -392,19 +400,23 @@
         {
           // If the tab is prerendered, browser.browserAction.set* fails
           // and we have to delay our changes until the currently visible tab
           // is replaced with the prerendered tab.
           browser.tabs.onReplaced.addListener(onReplaced);
         });
       }
     },
-    setIcon(path)
+    setIcon(path, imageData = null)
     {
-      this._addChange("iconPath", path);
+      // Use ImageData if available.
+      if (imageData)
+        this._addChange("iconImageData", imageData);
+      else
+        this._addChange("iconPath", path);
     },
     setBadge(badge)
     {
       if (!badge)
       {
         this._addChange("badgeText", "");
       }
       else