[iOS] Add chrome://suggestions WebUI

This WebUI is already present on other platforms. It will be useful for
testing upcoming refactoring of the suggestions component.

Change-Id: I303b02c04b0f90c34dd72bf0157199a60a26eb97
Reviewed-on: https://chromium-review.googlesource.com/574592
Reviewed-by: Sylvain Defresne <[email protected]>
Reviewed-by: Marc Treib <[email protected]>
Commit-Queue: Colin Blundell <[email protected]>
Cr-Commit-Position: refs/heads/master@{#488274}
diff --git a/ios/chrome/browser/ui/webui/BUILD.gn b/ios/chrome/browser/ui/webui/BUILD.gn
index fcda20bd..a17bac5 100644
--- a/ios/chrome/browser/ui/webui/BUILD.gn
+++ b/ios/chrome/browser/ui/webui/BUILD.gn
@@ -16,6 +16,8 @@
     "ntp_tiles_internals_ui.h",
     "physical_web_ui.cc",
     "physical_web_ui.h",
+    "suggestions_ui.cc",
+    "suggestions_ui.h",
     "terms_ui.h",
     "terms_ui.mm",
     "version_handler.cc",
@@ -36,6 +38,7 @@
     "//components/prefs",
     "//components/resources",
     "//components/strings",
+    "//components/suggestions",
     "//components/version_info",
     "//components/version_ui",
     "//google_apis",
@@ -46,6 +49,7 @@
     "//ios/chrome/browser/favicon:favicon",
     "//ios/chrome/browser/metrics",
     "//ios/chrome/browser/ntp_tiles",
+    "//ios/chrome/browser/suggestions",
     "//ios/chrome/browser/ui",
     "//ios/chrome/common",
     "//ios/web",