New illustrations for the Data Reduction Proxy promo

Also, fix the button alignment.

BUG=470433, 527266

Review URL: https://codereview.chromium.org/1303213004

Cr-Original-Commit-Position: refs/heads/master@{#347798}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 963891f0ae6078b07aa256c5024a618905c5d287

android/lint/suppressions.xml

@@ -104,4 +104,7 @@ Still reading?
   <issue id="UnusedAttribute" severity="ignore"/>
   <issue id="ViewConstructor" severity="ignore"/>
   <issue id="WrongCall" severity="ignore"/>
+  <issue id="UselessParent">
+    <ignore path="chrome/android/java/res/layout/data_reduction_promo_screen.xml" />
+  </issue>
 </lint>