Implement signin using webview

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
diff --git a/chrome/app/generated_resources.grd b/chrome/app/generated_resources.grd
index c214ca111f5d2e16ec9303e571f91e3963e1f15f..4796c728ccae7dd1ef97fbfc3ada1c081345dd55 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -13795,6 +13795,12 @@ Do you accept?
     <message name="IDS_FLAGS_ENABLE_WEB_BASED_SIGNIN_DESCRIPTION" desc="Description for the flag to enable web-based sign-in flows">
       When enabled, will use a pure web-based sign-in flow on first run/NTP/wrench menu/settings page. Otherwise use a native flow with embedded webview.
     </message>
+    <message name="IDS_FLAGS_ENABLE_WEBVIEW_BASED_SIGNIN_NAME" desc="Title for the flag to enable webview-based sign-in flows.">
+      Enable webview-based Chrome sign-in flows
+    </message>
+    <message name="IDS_FLAGS_ENABLE_WEBVIEW_BASED_SIGNIN_DESCRIPTION" desc="Description for the flag to enable webview-based sign-in flows">
+      When enabled, will use a webview-based Chrome sign-in flow.
+    </message>
     <message name="IDS_FLAGS_ENABLE_GOOGLE_PROFILE_INFO_NAME" desc="Title for the flag to enable the google profile information">
       Enable Google profile name and icon
     </message>