Adding DRP specfic UMA for FirstContentfulPaint

content/public/browser/navigation_handle.h

Index: content/public/browser/navigation_handle.h
diff --git a/content/public/browser/navigation_handle.h b/content/public/browser/navigation_handle.h
index f8a3b5e02fda3d45e37658e55253a77c4d3740bf..35161f52272fe9e987cdb313fc92dcdd82b665ef 100644
--- a/content/public/browser/navigation_handle.h
+++ b/content/public/browser/navigation_handle.h
@@ -159,15 +159,21 @@ class CONTENT_EXPORT NavigationHandle {
                                  bool has_user_gesture,
                                  ui::PageTransition transition,
                                  bool is_external_protocol) = 0;
 
   // Simulates the network request being redirected.
   virtual NavigationThrottle::ThrottleCheckResult
   CallWillRedirectRequestForTesting(const GURL& new_url,
                                     bool new_method_is_post,
                                     const GURL& new_referrer_url,
                                     bool new_is_external_protocol) = 0;
+
+  // Whether the navigation requested a LoFi version of the resource or not

[bengr, 2016/02/26 22:53:58]

All comments should be complete sentences. At the very least, end with a period.

[RyanSturm, 2016/03/01 19:36:04]

Done.

+  virtual bool IsUsingLofi() = 0;

[bengr, 2016/02/26 22:53:57]

This should probably be a const method.

[RyanSturm, 2016/03/01 19:36:04]

Done.

+
+  // Whether this navigation fetched it's resource through DataReductionProxy

[bengr, 2016/02/26 22:53:58]

Wrong "its."

+  virtual bool WasFetchedViaDataReductionProxy() = 0;

[bengr, 2016/02/26 22:53:58]

Also const.

[RyanSturm, 2016/03/01 19:36:04]

Done.

 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_NAVIGATION_HANDLE_H_