Add a chrome://webapks page.

chrome/chrome_paks.gni

Index: chrome/chrome_paks.gni
diff --git a/chrome/chrome_paks.gni b/chrome/chrome_paks.gni
index 27c483c27b3592829c5c675790de795fd371d354..f7485a7ee1fa801cac93976f93ae59fa01e37f16 100644
--- a/chrome/chrome_paks.gni
+++ b/chrome/chrome_paks.gni
@@ -98,6 +98,7 @@ template("chrome_extra_paks") {
       "$root_gen_dir/chrome/policy_resources.pak",
       "$root_gen_dir/chrome/task_scheduler_internals_resources.pak",
       "$root_gen_dir/chrome/translate_internals_resources.pak",
+      "$root_gen_dir/chrome/webapks_ui_resources.pak",

[Dan Beam, 2017/01/27 21:52:15]

i think you only want to add these on android, right?

[gonzalon, 2017/01/27 22:45:03]

Done.

       "$root_gen_dir/components/components_resources.pak",
       "$root_gen_dir/content/browser/tracing/tracing_resources.pak",
       "$root_gen_dir/content/content_resources.pak",
@@ -113,6 +114,7 @@ template("chrome_extra_paks") {
       "//chrome/browser/resources:policy_resources",
       "//chrome/browser/resources:task_scheduler_internals_resources",
       "//chrome/browser/resources:translate_internals_resources",
+      "//chrome/browser/resources:webapks_ui_resources",
       "//chrome/common:resources",
       "//components/resources",
       "//content:resources",