Add histograms for network activity, and total/cumulative

net/base/network_delegate.h

Index: net/base/network_delegate.h
===================================================================
--- net/base/network_delegate.h	(revision 150909)
+++ net/base/network_delegate.h	(working copy)
@@ -48,10 +48,12 @@
   };
   typedef base::Callback<void(AuthRequiredResponse)> AuthCallback;
 
-  enum CacheWaitState {
-    CACHE_WAIT_STATE_START,
-    CACHE_WAIT_STATE_FINISH,
-    CACHE_WAIT_STATE_RESET
+  enum RequestWaitState {
+    REQUEST_WAIT_STATE_CACHE_START,
+    REQUEST_WAIT_STATE_CACHE_FINISH,
+    REQUEST_WAIT_STATE_NETWORK_START,
+    REQUEST_WAIT_STATE_NETWORK_FINISH,
+    REQUEST_WAIT_STATE_RESET
   };
 
   virtual ~NetworkDelegate() {}
@@ -96,8 +98,8 @@
   int NotifyBeforeSocketStreamConnect(SocketStream* socket,
                                       const CompletionCallback& callback);
 
-  void NotifyCacheWaitStateChange(const URLRequest& request,
-                                  CacheWaitState state);
+  void NotifyRequestWaitStateChange(const URLRequest& request,
+                                    RequestWaitState state);
 
  private:
   // This is the interface for subclasses of NetworkDelegate to implement. These
@@ -225,15 +227,11 @@
       SocketStream* socket, const CompletionCallback& callback) = 0;
 
   // Called when the completion of a URLRequest is blocking on a cache
-  // transaction (CACHE_WAIT_STATE_START), or when a URLRequest is no longer
-  // blocked on a cache transaction (CACHE_WAIT_STATE_FINISH), or when a
-  // URLRequest is reset (CACHE_WAIT_STATE_RESET), indicating
-  // cancellation of any pending cache waits for this request.  Notice that
-  // START can be called several times for the same request.  It is the
-  // responsibility of the delegate to keep track of the number of outstanding
-  // cache transactions.
-  virtual void OnCacheWaitStateChange(const URLRequest& request,
-                                      CacheWaitState state) = 0;
+  // action or a network action, or when that is no longer the case.
+  // REQUEST_WAIT_STATE_RESET indicates for a given URLRequest
+  // cancellation of any pending waits for this request.
+  virtual void OnRequestWaitStateChange(const URLRequest& request,
+                                        RequestWaitState state) = 0;
 };
 
 }  // namespace net