[cros] Cache the URL of user's G+ profile photo to prevent redundant downloads.

chrome/browser/chromeos/login/user.cc

Index: chrome/browser/chromeos/login/user.cc
diff --git a/chrome/browser/chromeos/login/user.cc b/chrome/browser/chromeos/login/user.cc
index 777eec1ed0dba86caae0bdd9044de2a1da7f29f6..e3f79d67eb45de824be0c201c097c00d0d76d9d4 100644
--- a/chrome/browser/chromeos/login/user.cc
+++ b/chrome/browser/chromeos/login/user.cc
@@ -55,6 +55,10 @@ void User::SetImage(const UserImage& user_image, int image_index) {
   image_is_stub_ = false;
 }
 
+void User::SetImageURL(const GURL& image_url) {
+  user_image_.set_url(image_url);
+}
+
 void User::SetStubImage(int image_index) {
   user_image_.SetImage(*ResourceBundle::GetSharedInstance().GetImageSkiaNamed(
       kStubImageResourceID));