Transmit a X-Chrome-UMA-Enabled bit to Google domains from clients that have UMA enabled.

chrome/browser/profiles/profile_io_data.h

Index: chrome/browser/profiles/profile_io_data.h
diff --git a/chrome/browser/profiles/profile_io_data.h b/chrome/browser/profiles/profile_io_data.h
index 2f892ed9705340dff99fe79fe7e0f3f351b0146f..39169dd6dc058aaa8a0cacd4df1c71e403b86be0 100644
--- a/chrome/browser/profiles/profile_io_data.h
+++ b/chrome/browser/profiles/profile_io_data.h
@@ -107,6 +107,10 @@ class ProfileIOData {
     return &safe_browsing_enabled_;
   }
 
+  BooleanPrefMember* enable_metrics() const {
+    return &enable_metrics_;
+  }
+
   net::TransportSecurityState* transport_security_state() const {
     return transport_security_state_.get();
   }
@@ -114,6 +118,10 @@ class ProfileIOData {
   chrome_browser_net::HttpServerPropertiesManager*
       http_server_properties_manager() const;
 
+  bool is_incognito() const {
+    return is_incognito_;
+  }
+
  protected:
   class AppRequestContext : public ChromeURLRequestContext {
    public:
@@ -290,6 +298,7 @@ class ProfileIOData {
 
   // Member variables which are pointed to by the various context objects.
   mutable BooleanPrefMember enable_referrers_;
+  mutable BooleanPrefMember enable_metrics_;
   mutable BooleanPrefMember clear_local_state_on_exit_;
   mutable BooleanPrefMember safe_browsing_enabled_;
   // TODO(marja): Remove session_startup_pref_ if no longer needed.
@@ -333,6 +342,8 @@ class ProfileIOData {
   // TODO(jhawkins): Remove once crbug.com/102004 is fixed.
   bool initialized_on_UI_thread_;
 
+  mutable bool is_incognito_;

[battre, 2012/04/27 09:44:35]

why mutable?

[SteveT, 2012/04/27 14:17:47]

Oops - that shouldn't be mutable anymore. Originally, this was being initialized
in a const method along-side other mutable fields, but we now initialize it in
the ctor. Fixed.

+
   DISALLOW_COPY_AND_ASSIGN(ProfileIOData);
 };