Add Crostini Mascot

The Crostini Installer spec uses a mascot icon without a background rather than
the version with the background circle and shadow.

This adds the mascot for use in the WebUI Installer.

Bug: 867117
Change-Id: Id56d65c625e86f085e43d067b89395fa669c7012
Reviewed-on: https://chromium-review.googlesource.com/c/1319393Reviewed-by: Nicholas Verne <nverne@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Commit-Queue: Josh Pratt <jopra@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606680}

chrome/app/theme/chrome_unscaled_resources.grd

@@ -128,6 +128,7 @@
         <include name="IDR_LOGO_CROSTINI_TERMINAL" file="crostini/logo_crostini_terminal.png" type="BINDATA" />
         <include name="IDR_LOGO_CROSTINI_DEFAULT_32" file="crostini/logo_crostini_default_32.png" type="BINDATA" />
         <include name="IDR_LOGO_CROSTINI_DEFAULT_192" file="crostini/logo_crostini_default_192.png" type="BINDATA" />
+        <include name="IDR_CROSTINI_MASCOT" file="crostini/crostini_mascot_1x.svg" type="BINDATA" />
         <include name="IDR_LINUX_ILLUSTRATION" file="crostini/linux_illustration_2x.png" type="BINDATA" />
       </if>
     </includes>

chrome/app/theme/crostini/crostini_mascot_1x.svg

+<svg xmlns="http://www.w3.org/2000/svg" width="116" height="121" viewBox="0 0 116 121">
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+</svg>