Introduce a priority queue to the image loader.

chrome/browser/resources/image_loader/client.js

Index: chrome/browser/resources/image_loader/client.js
diff --git a/chrome/browser/resources/image_loader/client.js b/chrome/browser/resources/image_loader/client.js
index 5a1e3c138b000bbaf531ca6e48c4c5df068f4a91..dc7535fbde955127fee82cea0c7a3e46c800a2cc 100644
--- a/chrome/browser/resources/image_loader/client.js
+++ b/chrome/browser/resources/image_loader/client.js
@@ -269,7 +269,6 @@ ImageLoader.Client.Cache.prototype.evictCache_ = function(size) {
  */
 ImageLoader.Client.Cache.prototype.saveImage = function(
     key, data, opt_timestamp) {
-
   // If the image is currently in cache, then remove it.
   if (this.images_[key])
     this.removeImage(key);
@@ -353,6 +352,7 @@ ImageLoader.Client.Cache.prototype.removeImage = function(key) {
  */
 ImageLoader.Client.loadToImage = function(url, image, options, onSuccess,
     onError, opt_isValid) {
+  options.cache = false;
   var callback = function(result) {
     if (result.status == 'error') {
       onError();