DevTools: Bundle device images for Chrome OS

Bug: 747349
Change-Id: I66b8eed3b9652d33122c97c33319373088ab9347
Reviewed-on: https://chromium-review.googlesource.com/1030756Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Commit-Queue: Paul Irish <paulirish@chromium.org>
Cr-Commit-Position: refs/heads/master@{#555268}

third_party/blink/renderer/devtools/BUILD.gn

@@ -1127,7 +1127,7 @@ action("generate_devtools_grd") {
 
   # Bundle remote modules in ChromeOS.
   if (is_chromeos) {
-    grd_files += generated_remote_modules
+    grd_files += generated_remote_modules + devtools_emulated_devices_images
   }
 
   inputs = grd_files + devtools_image_files