Update avatar button to MD

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 415 matching lines @@
         <structure type="chrome_scaled_image" name="IDR_AVATAR_NATIVE_BUTTON_HOVER_TOP_RIGHT" file="win/avatar_button/win8/sign_in_button_hover_top_right.png" />
         <structure type="chrome_scaled_image" name="IDR_AVATAR_NATIVE_BUTTON_PRESSED_BOTTOM" file="win/avatar_button/win8/sign_in_button_pressed_bottom.png" />
         <structure type="chrome_scaled_image" name="IDR_AVATAR_NATIVE_BUTTON_PRESSED_BOTTOM_LEFT" file="win/avatar_button/win8/sign_in_button_pressed_bottom_left.png" />
         <structure type="chrome_scaled_image" name="IDR_AVATAR_NATIVE_BUTTON_PRESSED_BOTTOM_RIGHT" file="win/avatar_button/win8/sign_in_button_pressed_bottom_right.png" />
         <structure type="chrome_scaled_image" name="IDR_AVATAR_NATIVE_BUTTON_PRESSED_CENTER" file="win/avatar_button/win8/sign_in_button_pressed_center.png" />
         <structure type="chrome_scaled_image" name="IDR_AVATAR_NATIVE_BUTTON_PRESSED_LEFT" file="win/avatar_button/win8/sign_in_button_pressed_left.png" />
         <structure type="chrome_scaled_image" name="IDR_AVATAR_NATIVE_BUTTON_PRESSED_RIGHT" file="win/avatar_button/win8/sign_in_button_pressed_right.png" />
         <structure type="chrome_scaled_image" name="IDR_AVATAR_NATIVE_BUTTON_PRESSED_TOP" file="win/avatar_button/win8/sign_in_button_pressed_top.png" />
         <structure type="chrome_scaled_image" name="IDR_AVATAR_NATIVE_BUTTON_PRESSED_TOP_LEFT" file="win/avatar_button/win8/sign_in_button_pressed_top_left.png" />
         <structure type="chrome_scaled_image" name="IDR_AVATAR_NATIVE_BUTTON_PRESSED_TOP_RIGHT" file="win/avatar_button/win8/sign_in_button_pressed_top_right.png" />
+
+        <!-- Windows 10 Material Design -->
+        <structure type="chrome_scaled_image" name="IDR_AVATAR_MD_BUTTON_AVATAR" file="win/avatar_button/win10/sign_in_button_avatar.png" />

[Peter Kasting, 2017/04/26 02:09:53]

Please don't introduce new PNG resources; use vector resources (in .icon format)
instead.

You can easily create .icons from .svgs if the designers supply those, or
(ideally) from the original Material Design icons when they match -- looks like
this is https://material.io/icons/#ic_account_circle .

Check to make sure we don't already have this icon in our tree.

[emx, 2017/04/27 16:30:57]

Done.

       </if>  <!-- toolkit_views and not is_macosx -->
       <if expr="enable_app_list">
         <structure type="chrome_scaled_image" name="IDR_PROFILE_PICTURE_LOADING" file="profile_loading.png" />
       </if>
       <if expr="chromeos">
         <structure type="chrome_scaled_image" name="IDR_RESET_WARNING" file="cros/reset_warning.png" />
       </if>
       <structure type="chrome_scaled_image" name="IDR_RESTORE_BUTTON_MASK" file="common/restore_button_mask.png" />
       <if expr="is_macosx">
         <structure type="chrome_scaled_image" name="IDR_SAFEBROWSING_WARNING" file="legacy/safebrowsing_warning.png" />
@@ skipping 93 matching lines @@
       </if>
       <if expr="_google_chrome">
         <structure type="chrome_scaled_image" name="IDR_WEBSTORE_ICON" file="google_chrome/webstore_icon.png" />
         <structure type="chrome_scaled_image" name="IDR_WEBSTORE_ICON_16" file="google_chrome/webstore_icon_16.png" />
         <structure type="chrome_scaled_image" name="IDR_WEBSTORE_ICON_24" file="google_chrome/webstore_icon_24.png" />
         <structure type="chrome_scaled_image" name="IDR_WEBSTORE_ICON_32" file="google_chrome/webstore_icon_32.png" />
       </if>
     </structures>
   </release>
 </grit>