Modify experimental identity flow to display scope descriptions and details.

chrome/common/chrome_switches.cc

Index: chrome/common/chrome_switches.cc
diff --git a/chrome/common/chrome_switches.cc b/chrome/common/chrome_switches.cc
index 477eedd483d3a13532f17e2f273861ed8144e70f..d6d1d130ca71317a6041c36641298bd6da662161 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -231,6 +231,10 @@ const char kDebugEnableFrameToggle[]        = "debug-enable-frame-toggle";
 // Enables support to debug printing subsystem.
 const char kDebugPrint[]                    = "debug-print";
 
+// For the experimental identity API, do not grant scopes unless the user has
+// explicitly approved them.
+const char kDemandUserScopeApproval[]        = "demand-user-scope-approval";
+
 // Specifies the URL at which to fetch configuration policy from the device
 // management backend. Specifying this switch turns on managed policy from the
 // device management backend.