diff --git a/experimental/canvaskit/interface.js b/experimental/canvaskit/interface.js
index 938ef3e..885d7e2 100644
--- a/experimental/canvaskit/interface.js
+++ b/experimental/canvaskit/interface.js
@@ -107,53 +107,11 @@
       return this;
     };
 
-    if (CanvasKit.gpu) {
-      CanvasKit.getWebGLSurface = function(htmlID) {
-        var canvas = document.getElementById(htmlID);
-        if (!canvas) {
-          throw 'Canvas with id ' + htmlID + ' was not found';
-        }
-        // Maybe better to use clientWidth/height.  See:
-        // https://webglfundamentals.org/webgl/lessons/webgl-anti-patterns.html
-        return this._getWebGLSurface(htmlID, canvas.width, canvas.height);
-      };
-
-      CanvasKit.SkSurface.prototype.flush = function() {
-        this._flush();
-      }
-    } else {
-      CanvasKit.getRasterN32PremulSurface = function(htmlID) {
-        var canvas = document.getElementById(htmlID);
-        if (!canvas) {
-          throw 'Canvas with id ' + htmlID + ' was not found';
-        }
-        // Maybe better to use clientWidth/height.  See:
-        // https://webglfundamentals.org/webgl/lessons/webgl-anti-patterns.html
-        var surface = this._getRasterN32PremulSurface(canvas.width, canvas.height);
-        if (surface) {
-          surface.canvas = canvas;
-          surface._width = canvas.width;
-          surface._height = canvas.height;
-          surface._pixelLen = surface._width * surface._height * 4; // it's 8888
-          // Allocate the buffer of pixels to be used to draw back and forth.
-          surface._pixelPtr = CanvasKit._malloc(surface._pixelLen);
-        }
-        return surface;
-      };
-
-      CanvasKit.SkSurface.prototype.flush = function() {
-        this._flush();
-        var success = this._readPixels(this._width, this._height, this._pixelPtr);
-        if (!success) {
-          console.err('could not read pixels');
-          return;
-        }
-
-        var pixels = new Uint8ClampedArray(CanvasKit.buffer, this._pixelPtr, this._pixelLen);
-        var imageData = new ImageData(pixels, this._width, this._height);
-
-        this.canvas.getContext('2d').putImageData(imageData, 0, 0);
-      };
+    // Run through the JS files that are added at compile time.
+    if (CanvasKit._extraInitializations) {
+      CanvasKit._extraInitializations.forEach(function(init) {
+        init();
+      });
     }
   } // end CanvasKit.onRuntimeInitialized, that is, anything changing prototypes or dynamic.