Replaced onboarding image.

Also adjusted the paddings to account for the different aspect ratio of the new image.

Bug: 806868
Change-Id: I7bd161dfd8b74b784d934ba5ec1dce37793bfe85
Reviewed-on: https://chromium-review.googlesource.com/c/1352161Reviewed-by: Peter Wen <wnwen@chromium.org>
Reviewed-by: Theresa <twellington@chromium.org>
Commit-Queue: Theresa <twellington@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612227}

build/android/lint/suppressions.xml

@@ -119,6 +119,8 @@ Still reading?
     <ignore regexp="content/public/android/java/res/drawable-xxxhdpi"/>
     <ignore regexp="ui/android/java/res/drawable-xxhdpi"/>
     <ignore regexp="ui/android/java/res/drawable-xxxhdpi"/>
+    <!-- This is intentional to reduce APK size. See: http://crrev/c/1352161 -->
+    <ignore regexp="chrome/android/java/res_autofill_assistant/drawable-*"/>
   </issue>
   <issue id="IconDipSize">
     <ignore regexp="chromecast/internal"/>

chrome/android/java/res_autofill_assistant/layout/init_screen.xml

@@ -38,10 +38,13 @@
         <ImageView
             tools:ignore="contentDescription"
             android:layout_width="250dp"
-            android:layout_height="170dp"
+            android:layout_height="141dp"
             android:scaleType="centerCrop"
             android:src="@drawable/onboarding_background"
-            android:paddingStart="50dp"/>
+            android:paddingStart="25dp"
+            android:paddingEnd="25dp"
+            android:paddingTop="10dp"
+            android:paddingBottom="15dp"/>
 
         <TextView
             android:layout_height="wrap_content"