Enable Activity Logging by default

chrome/browser/extensions/api/web_request/web_request_api.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/extensions/api/web_request/web_request_api.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 1658 matching lines @@
     return;
 
   BlockedRequest& blocked_request = blocked_requests_[request_id];
   int num_handlers_blocking = --blocked_request.num_handlers_blocking;
   CHECK_GE(num_handlers_blocking, 0);
 
   if (response) {
     helpers::EventResponseDelta* delta =
         CalculateDelta(&blocked_request, response);
 
-    if (extensions::ActivityLog::IsLogEnabledOnAnyProfile()) {
-      LogExtensionActivity(profile,
-                           blocked_request.is_incognito,
-                           extension_id,
-                           blocked_request.request->url(),
-                           event_name,
-                           SummarizeResponseDelta(event_name, *delta));
-    }
+    LogExtensionActivity(profile,

[Matt Perry, 2013/08/30 20:49:20]

Actually, I just realized that LogAction is not the interesting call to measure.
I'd be interested to measure calls like this (and all the other ones that used
to be gated on ActivityLog::IsEnabled()), because that's where the extra
processing is done to create the args details object. Would you mind doing the
test again measuring those? For the webRequest one, make sure Adblock is
installed.

+                         blocked_request.is_incognito,
+                         extension_id,
+                         blocked_request.request->url(),
+                         event_name,
+                         SummarizeResponseDelta(event_name, *delta));
 
     blocked_request.response_deltas.push_back(
         linked_ptr<helpers::EventResponseDelta>(delta));
   }
 
   base::TimeDelta block_time =
       base::Time::Now() - blocked_request.blocking_time;
   if (!extension_id.empty()) {
     request_time_tracker_->IncrementExtensionBlockTime(
         extension_id, request_id, block_time);
@@ skipping 601 matching lines @@
       } else if ((*it)->name().find("AdBlock") != std::string::npos) {
         adblock = true;
       } else {
         other = true;
       }
     }
   }
 
   host->Send(new ExtensionMsg_UsingWebRequestAPI(adblock, adblock_plus, other));
 }