[imageloader] Add chrome://file-manager to image_loader_client.js

image_loader_client.js re-writes the requesting client's origin to the
image loader exension's origin before sending the request to the image
loader extension (using chrome.runtime.sendMessage).

Add a re-write RegEx for chrome://file-manager. Note that this assumes
chrome://file-manager has enabled chrome.runtime.sendMessage.

Bug: 1113981
Change-Id: I8381eb60bdacb958521f1b34bfceb0e00bff2b6e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2602963
Commit-Queue: Noel Gordon <noel@chromium.org>
Reviewed-by: Alex Danilo <adanilo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#839655}

ui/file_manager/image_loader/image_loader_client.js

@@ -98,6 +98,12 @@ ImageLoaderClient.sendMessage_ = function(request, callback) {
  */
 ImageLoaderClient.CLIENT_URL_REGEX = /filesystem:chrome-extension:\/\/[a-z]+/;
 
+/**
+ * Image loader client chrome://file-manager request URL matcher.
+ * @const {!RegExp}
+ */
+ImageLoaderClient.CLIENT_SWA_REGEX = /filesystem:chrome:\/\/file-manager/;
+
 /**
  * All client request URL match ImageLoaderClient.CLIENT_URL_REGEX and all are
  * rewritten: the client extension id part of the request URL is replaced with
@@ -119,9 +125,11 @@ ImageLoaderClient.prototype.load = function(request, callback) {
   ImageLoaderClient.recordPercentage('Cache.Usage',
       this.cache_.size() / ImageLoaderClient.CACHE_MEMORY_LIMIT * 100.0);
 
-  // Replace the client extension id with the image loader extension id.
+  // Replace the client origin with the image loader extension origin.
   request.url = request.url.replace(
       ImageLoaderClient.CLIENT_URL_REGEX, ImageLoaderClient.IMAGE_LOADER_URL);
+  request.url = request.url.replace(
+      ImageLoaderClient.CLIENT_SWA_REGEX, ImageLoaderClient.IMAGE_LOADER_URL);
 
   // Try to load from cache, if available.
   const cacheKey = LoadImageRequest.cacheKey(request);