Photo Picker dialog: Polish to adhere better to spec.

chrome/android/java/res/values/colors.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>
     <!-- Common colors -->
     <color name="default_text_color">@color/black_alpha_87</color>
     <color name="default_primary_color">#f2f2f2</color>
     <color name="light_normal_color">#5A5A5A</color>
@@ skipping 177 matching lines @@
     <color name="webapp_url_bar_separator">#e1e1e1</color>
 
     <!-- Bookmark UI colors -->
     <color name="bookmark_detail_section">#7C7B79</color>
 
     <!-- Favicon colors -->
     <color name="default_favicon_background_color">#ff787878</color>
 
     <!-- Photo Picker colors -->
     <color name="photo_picker_tile_bg_color">@color/google_grey_200</color>
-    <color name="photo_picker_special_tile_bg_color">@color/dark_action_bar_color</color>
-    <color name="photo_picker_special_tile_color">@android:color/white</color>
-    <color name="photo_picker_special_tile_disabled_bg_color">@color/google_grey_300</color>
+    <color name="photo_picker_special_tile_bg_color">@color/google_grey_300</color>
+    <color name="photo_picker_special_tile_color">@color/black_alpha_40</color>
     <color name="photo_picker_special_tile_disabled_color">@color/google_grey_400</color>
 
     <!-- Bookmark widget colors -->
     <color name="bookmark_widget_pressed_highlight">#1D000000</color>
 
     <!-- Physical Web diagnostics colors -->
     <color name="physical_web_diags_success_color">#00933b</color>
     <color name="physical_web_diags_failure_color">#f90101</color>
     <color name="physical_web_diags_indeterminate_color">#f2b50f</color>
 
     <!-- Payments UI colors -->
     <color name="payments_section_edit_background">#f5f5f5</color>
     <color name="payments_section_chevron">#b2b2b2</color>
     <color name="payments_section_separator">#e0e0e0</color>
 
     <!-- Translate Infobar colors -->
     <color name="translate_overflow_menu_divider_color">#e0e0e0</color>
 
     <!-- Other colors -->
     <color name="selectable_list_item_highlight_color">#804281f4</color>
     <color name="media_viewer_bg">#000000</color>
     <color name="image_viewer_bg">#0e0e0e</color>
 
 </resources>