chromium/chrome/app/visual_elements_resources/chrome.VisualElementsManifest.xml

<!-- This is only meant to be copied by chrome.exe in developer builds. -->
<Application xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <VisualElements
    BackgroundColor="#212121"
    ShowNameOnSquare150x150Logo="on"
    ForegroundText="light"
    Square150x150Logo="Logo.png"
    Square70x70Logo="SmallLogo.png"
    Square44x44Logo="SmallLogo.png"/>
</Application>