Photo Picker Dialog: Add caching for the decoded images.

chrome/android/java/res/values/dimens.xml

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Copyright 2014 The Chromium Authors. All rights reserved.
      Use of this source code is governed by a BSD-style license that can be
      found in the LICENSE file. -->
 
 <resources>
     <!-- Connection info popup dimensions -->
     <dimen name="connection_info_padding_wide">24dp</dimen>
     <dimen name="connection_info_padding_thin">16dp</dimen>
 
@@ skipping 356 matching lines @@
     <dimen name="default_favicon_corner_radius">3dp</dimen>
     <dimen name="default_favicon_icon_text_size">10dp</dimen>
     <dimen name="default_favicon_min_size">16px</dimen>
 
     <!-- Photo Picker dimensions -->
     <dimen name="photo_picker_selected_padding">12dp</dimen>
     <dimen name="photo_picker_special_icon_size">48dp</dimen>
     <dimen name="photo_picker_label_gap">10dp</dimen>
     <dimen name="photo_picker_tile_min_size">100dp</dimen>
     <dimen name="photo_picker_tile_gap">4dp</dimen>
+    <dimen name="photo_picker_grainy_thumbnail_size">12dp</dimen>
 
     <!-- Account chooser dialog dimensions -->
     <dimen name="account_chooser_dialog_margin">24dp</dimen>
     <dimen name="account_chooser_dialog_item_margin">24dp</dimen>
     <dimen name="account_chooser_dialog_title_main_text_size">18sp</dimen>
     <dimen name="account_chooser_dialog_title_descriptive_text_size">16sp</dimen>
 
     <!-- Public Suffix List (PSL) info button and tooltip dimensions -->
     <dimen name="psl_info_tooltip_margin">8dp</dimen>
 
@@ skipping 77 matching lines @@
     <dimen name="action_bar_shadow_height">10dp</dimen>
     <dimen name="card_corner_radius">2dp</dimen>
     <dimen name="list_item_corner_radius">3dp</dimen>
     <dimen name="list_item_lateral_padding">1dp</dimen>
     <dimen name="list_item_default_margin">16dp</dimen>
     <dimen name="signin_and_sync_view_padding">16dp</dimen>
 
     <!-- Context Menu Dimensions -->
     <dimen name="context_menu_header_image_min_size">56dp</dimen>
     <dimen name="context_menu_header_image_max_size">56dp</dimen>
-    
+
     <!-- Divider Dimensions -->
     <dimen name="divider_height">1dp</dimen>
 
     <!-- Search widget dimensions -->
     <dimen name="search_activity_location_bar_margin_start">16dp</dimen>
     <dimen name="search_activity_location_bar_margin_end">8dp</dimen>
 </resources>