Implement new password separated sign in flow for chrome desktop.

tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index f1cfd4d689e1849af3878486fce15af7ddfa8475..0824e74525faba7b012ea54075a6b5cbae95ce30 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -63706,6 +63706,7 @@ To add a new entry, add it with any value and run test to compute valid value.
   <int value="-749048160" label="enable-panels"/>
   <int value="-744159181" label="disable-spdy-proxy-dev-auth-origin"/>
   <int value="-743103250" label="enable-linkable-ephemeral-apps"/>
+  <int value="-716953514" label="disable-password-separated-signin-flow"/>
   <int value="-711890895" label="enable-website-settings-manager"/>
   <int value="-699767107" label="enable-sync-app-list"/>
   <int value="-697751423" label="disable-quickoffice-component-app"/>
@@ -64015,6 +64016,7 @@ To add a new entry, add it with any value and run test to compute valid value.
   <int value="1862207743" label="enable-android-spellchecker"/>
   <int value="1865799183" label="javascript-harmony"/>
   <int value="1891210939" label="enable-blink-features"/>
+  <int value="1892201400" label="enable-password-separated-signin-flow"/>
   <int value="1896456311" label="enable-password-save-in-page-navigation"/>
   <int value="1900529524" label="disable-touch-drag-drop"/>
   <int value="1906942630" label="enable-easy-unlock"/>