ChromeOS OOBE: Add new image to Welcome dialog.

chrome/browser/resources/chromeos/login/oobe_welcome_dialog.html

Index: chrome/browser/resources/chromeos/login/oobe_welcome_dialog.html
diff --git a/chrome/browser/resources/chromeos/login/oobe_welcome_dialog.html b/chrome/browser/resources/chromeos/login/oobe_welcome_dialog.html
index 5e290c1f361754ec857bca0b78141617d6f55152..7105dd763aef62b352a52ec8cfe6f4f16b9898e3 100644
--- a/chrome/browser/resources/chromeos/login/oobe_welcome_dialog.html
+++ b/chrome/browser/resources/chromeos/login/oobe_welcome_dialog.html
@@ -16,8 +16,9 @@
       <div class="vertical-margin"></div>
       <div class="welcome-content flex layout vertical center">
         <h1 id="title" i18n-content="networkScreenGreeting"></h1>
-        <!-- TODO(alemate): Display images depending on screen ppi. -->
-        <img id="welcomeIllustration" src="images/welcome_illustration_2x.png">
+        <img id="welcomeIllustration"
+            srcset="images/welcome_illustration_1x.png 1x,
+                    images/welcome_illustration_2x.png 2x">
         <div hidden="[[!debuggingLinkVisible]]">
           <a href="#" i18n-content="debuggingFeaturesLink"
               on-tap="onDebuggingLinkClicked_"></a>