[ios] Adds BrandedImageProvider and its associated image resources.

ios/chrome/app/theme/ios_theme_resources.grd

 <?xml version="1.0" encoding="utf-8"?>
 <!-- This grd file contains images that are pre-scaled for device scale
      factors. The image returned by |base::ResourceBundle::GetImageNamed|
      will contain multiple |gfx:ImageSkiaReps| for each scale factors. The
      |fallback_to_low_resolution| attribute controls behavior when
      an image file is missing for target scale factor. If true, chrome
      will automatically scale the 1x image to the target scale factor.
      If false, build will fail due to missing resources. This is
      currently set to true for all resources, but the default will
      become false in near future.
@@ skipping 14 matching lines @@
       <!-- KEEP THESE IN ALPHABETICAL ORDER!  DO NOT ADD TO RANDOM PLACES JUST
            BECAUSE YOUR RESOURCES ARE FUNCTIONALLY RELATED OR FALL UNDER THE
            SAME CONDITIONALS. -->
       <!-- The toolbar button images are mapped from name/style/state
            combinations to the appropriate resource ID using a 3-dimensional
            array built with macros. For example, 'IDR_IOS_TOOLBAR_DARK_BACK' and
            its variations do not appear in code.  Instead, a macro call is used,
            TOOLBAR_IDR_THREE_STATE(BACK), to add its variations to the array.
            The easiest way to find the use of a given resource ID:
            'git grep TOOLBAR_IDR_.*BACK' -->
+      <structure type="chrome_scaled_image" name="IDR_IOS_CONTEXTUAL_SEARCH_HEADER" file="contextual_search_header.png" />
       <structure type="chrome_scaled_image" name="IDR_IOS_INFOBAR_AUTOLOGIN" file="infobar_autologin.png" />
       <structure type="chrome_scaled_image" name="IDR_IOS_INFOBAR_SAVE_PASSWORD" file="infobar_save_password.png" />
       <structure type="chrome_scaled_image" name="IDR_IOS_INFOBAR_TRANSLATE" file="infobar_translate.png" />
       <structure type="chrome_scaled_image" name="IDR_IOS_LOCATION_BAR_HTTP" file="omnibox_http.png" />
       <structure type="chrome_scaled_image" name="IDR_IOS_OMNIBOX_HISTORY" file="omnibox_history.png" />
       <structure type="chrome_scaled_image" name="IDR_IOS_OMNIBOX_HISTORY_INCOGNITO" file="omnibox_history_incognito.png" />
       <structure type="chrome_scaled_image" name="IDR_IOS_OMNIBOX_HTTP" file="omnibox_http.png" />
       <structure type="chrome_scaled_image" name="IDR_IOS_OMNIBOX_HTTPS_INVALID" file="omnibox_https_invalid.png" />
       <structure type="chrome_scaled_image" name="IDR_IOS_OMNIBOX_HTTPS_POLICY_WARNING" file="controlled_setting_mandatory.png" />
       <structure type="chrome_scaled_image" name="IDR_IOS_OMNIBOX_HTTPS_VALID" file="omnibox_https_valid.png" />
       <structure type="chrome_scaled_image" name="IDR_IOS_OMNIBOX_HTTP_INCOGNITO" file="omnibox_http_incognito.png" />
       <structure type="chrome_scaled_image" name="IDR_IOS_OMNIBOX_SEARCH" file="omnibox_search.png" />
       <structure type="chrome_scaled_image" name="IDR_IOS_OMNIBOX_SEARCH_INCOGNITO" file="omnibox_search_incognito.png" />
       <structure type="chrome_scaled_image" name="IDR_IOS_OMNIBOX_STAR" file="omnibox_star.png" />
       <structure type="chrome_scaled_image" name="IDR_IOS_OMNIBOX_STAR_INCOGNITO" file="omnibox_star_incognito.png" />
+      <structure type="chrome_scaled_image" name="IDR_IOS_PROMO_INFO" file="promo_info.png" />
+      <structure type="chrome_scaled_image" name="IDR_IOS_SETTINGS_INFO_24" file="settings_info_24.png" />
       <structure type="chrome_scaled_image" name="IDR_IOS_TOOLBAR_DARK_BACK" file="toolbar_dark_back.png" />
       <structure type="chrome_scaled_image" name="IDR_IOS_TOOLBAR_DARK_BACK_DISABLED" file="toolbar_dark_back_disabled.png" />
       <structure type="chrome_scaled_image" name="IDR_IOS_TOOLBAR_DARK_BACK_PRESSED" file="toolbar_dark_back_pressed.png" />
       <structure type="chrome_scaled_image" name="IDR_IOS_TOOLBAR_DARK_BACKGROUND" file="toolbar_dark_background.png" />
       <structure type="chrome_scaled_image" name="IDR_IOS_TOOLBAR_DARK_FORWARD" file="toolbar_dark_forward.png" />
       <structure type="chrome_scaled_image" name="IDR_IOS_TOOLBAR_DARK_FORWARD_DISABLED" file="toolbar_dark_forward_disabled.png" />
       <structure type="chrome_scaled_image" name="IDR_IOS_TOOLBAR_DARK_FORWARD_PRESSED" file="toolbar_dark_forward_pressed.png" />
       <structure type="chrome_scaled_image" name="IDR_IOS_TOOLBAR_DARK_OVERVIEW" file="toolbar_dark_overview.png" />
       <structure type="chrome_scaled_image" name="IDR_IOS_TOOLBAR_DARK_OVERVIEW_DISABLED" file="toolbar_dark_overview_disabled.png" />
       <structure type="chrome_scaled_image" name="IDR_IOS_TOOLBAR_DARK_OVERVIEW_PRESSED" file="toolbar_dark_overview_pressed.png" />
@@ skipping 41 matching lines @@
       <structure type="chrome_scaled_image" name="IDR_IOS_TOOLBAR_LIGHT_TOOLS_PRESSED" file="toolbar_light_tools_pressed.png" />
       <structure type="chrome_scaled_image" name="IDR_IOS_TOOLBAR_LIGHT_TTS" file="toolbar_tts.png" />
       <structure type="chrome_scaled_image" name="IDR_IOS_TOOLBAR_LIGHT_TTS_PRESSED" file="toolbar_tts_pressed.png" />
       <structure type="chrome_scaled_image" name="IDR_IOS_TOOLBAR_LIGHT_VOICE" file="toolbar_light_voice.png" />
       <structure type="chrome_scaled_image" name="IDR_IOS_TOOLBAR_LIGHT_VOICE_PRESSED" file="toolbar_light_voice_pressed.png" />
       <structure type="chrome_scaled_image" name="IDR_IOS_TOOLBAR_SHADOW" file="toolbar_shadow.png" />
       <structure type="chrome_scaled_image" name="IDR_IOS_TOOLBAR_SHADOW_FULL_BLEED" file="toolbar_shadow_full_bleed.png" />
     </structures>
   </release>
 </grit>