Add channel-specific product logo to chrome://help

chrome/app/theme/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 579 matching lines @@
         <structure type="chrome_scaled_image" name="IDR_PRINTER_NOTIFICATION" file="cros/printer_notification.png" />
       </if>
       <if expr="not _google_chrome">
         <structure type="chrome_scaled_image" name="IDR_PRODUCT_LOGO" file="chromium/product_logo.png" />
         <structure type="chrome_scaled_image" name="IDR_PRODUCT_LOGO_16" file="chromium/product_logo_16.png" />
         <structure type="chrome_scaled_image" name="IDR_PRODUCT_LOGO_26" file="chromium/product_logo_26.png" />
         <structure type="chrome_scaled_image" name="IDR_PRODUCT_LOGO_32" file="chromium/product_logo_32.png" />
         <structure type="chrome_scaled_image" name="IDR_PRODUCT_LOGO_NAME_48" file="chromium/product_logo_name_48.png" />
         <structure type="chrome_scaled_image" name="IDR_PRODUCT_LOGO_WHITE" file="chromium/product_logo_white.png" />
       </if>
       <if expr="_google_chrome">

[Dan Beam, 2015/08/06 03:17:55]

ah, this is why

         <structure type="chrome_scaled_image" name="IDR_PRODUCT_LOGO" file="google_chrome/product_logo.png" />

[Dan Beam, 2015/08/05 22:41:25]

why can't we just change IDR_PRODUCT_LOGO based on the channel at compile time?

[Evan Stade, 2015/08/06 01:19:59]

channel is not a compile time property

         <structure type="chrome_scaled_image" name="IDR_PRODUCT_LOGO_16" file="google_chrome/product_logo_16.png" />
         <structure type="chrome_scaled_image" name="IDR_PRODUCT_LOGO_26" file="google_chrome/product_logo_26.png" />
         <structure type="chrome_scaled_image" name="IDR_PRODUCT_LOGO_32" file="google_chrome/product_logo_32.png" />
+        <structure type="chrome_scaled_image" name="IDR_PRODUCT_LOGO_32_BETA" file="google_chrome/product_logo_32_beta.png" />
+        <structure type="chrome_scaled_image" name="IDR_PRODUCT_LOGO_32_CANARY" file="google_chrome/product_logo_32_canary.png" />
+        <structure type="chrome_scaled_image" name="IDR_PRODUCT_LOGO_32_DEV" file="google_chrome/product_logo_32_dev.png" />
         <structure type="chrome_scaled_image" name="IDR_PRODUCT_LOGO_NAME_48" file="google_chrome/product_logo_name_48.png" />
         <structure type="chrome_scaled_image" name="IDR_PRODUCT_LOGO_WHITE" file="google_chrome/product_logo_white.png" />
       </if>
 
       <!-- TODO(noms): Once -enable-new-avatar-menu has landed and did not
           get reverted for an entire release, delete the old windows-only
           resources, and rename these to not be mac-specific -->
       <structure type="chrome_scaled_image" name="IDR_PROFILE_AVATAR_0" file="common/profile_avatar_generic_mac.png" />
       <structure type="chrome_scaled_image" name="IDR_PROFILE_AVATAR_1" file="common/profile_avatar_generic_aqua_mac.png" />
       <structure type="chrome_scaled_image" name="IDR_PROFILE_AVATAR_2" file="common/profile_avatar_generic_blue_mac.png" />
@@ skipping 407 matching lines @@
       <!-- People search images -->
       <structure type="chrome_scaled_image" name="IDR_PEOPLE_SEARCH_ACTION_EMAIL" file="common/mail.png" />
       <structure type="chrome_scaled_image" name="IDR_PEOPLE_SEARCH_ACTION_EMAIL_HOVER" file="common/mail_hover.png" />
       <structure type="chrome_scaled_image" name="IDR_PEOPLE_SEARCH_ACTION_EMAIL_PRESSED" file="common/mail_pressed.png" />
       <structure type="chrome_scaled_image" name="IDR_PEOPLE_SEARCH_ACTION_CHAT" file="common/chat.png" />
       <structure type="chrome_scaled_image" name="IDR_PEOPLE_SEARCH_ACTION_CHAT_HOVER" file="common/chat_hover.png" />
       <structure type="chrome_scaled_image" name="IDR_PEOPLE_SEARCH_ACTION_CHAT_PRESSED" file="common/chat_pressed.png" />
     </structures>
   </release>
 </grit>