Adding instrumentation to locate the source of jankiness.

content/browser/webui/url_data_manager_backend.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 "content/browser/webui/url_data_manager_backend.h"
 
 #include <set>
 
 #include "base/basictypes.h"
 #include "base/bind.h"
@@ skipping 319 matching lines @@
   TRACE_EVENT_ASYNC_END0("browser", "DataManager:Request", this);
   if (bytes) {
     // The request completed, and we have all the data.
     // Clear any IO pending status.
     SetStatus(net::URLRequestStatus());
 
     data_ = bytes;
     int bytes_read;
     if (pending_buf_.get()) {
       CHECK(pending_buf_->data());
+      // TODO(pkasting): Remove ScopedTracker below once crbug.com/455423 is
+      // fixed.
+      tracked_objects::ScopedTracker tracking_profile(
+          FROM_HERE_WITH_EXPLICIT_FUNCTION(
+              "455423 URLRequestChromeJob::CompleteRead"));
       CompleteRead(pending_buf_.get(), pending_buf_size_, &bytes_read);
       pending_buf_ = NULL;
       NotifyReadComplete(bytes_read);
     }
   } else {
+    // TODO(pkasting): Remove ScopedTracker below once crbug.com/455423 is
+    // fixed.
+    tracked_objects::ScopedTracker tracking_profile(
+        FROM_HERE_WITH_EXPLICIT_FUNCTION("455423 URLRequestJob::NotifyDone"));
     // The request failed.
     NotifyDone(net::URLRequestStatus(net::URLRequestStatus::FAILED,
                                      net::ERR_FAILED));
   }
 }
 
 bool URLRequestChromeJob::ReadRawData(net::IOBuffer* buf, int buf_size,
                                       int* bytes_read) {
   // TODO(vadimt): Remove ScopedTracker below once crbug.com/423948 is fixed.
   tracked_objects::ScopedTracker tracking_profile(
@@ skipping 354 matching lines @@
        i != pending_requests_.end(); ++i) {
     if (i->second == job) {
       pending_requests_.erase(i);
       return;
     }
   }
 }
 
 void URLDataManagerBackend::DataAvailable(RequestID request_id,
                                           base::RefCountedMemory* bytes) {
+  // TODO(pkasting): Remove ScopedTracker below once crbug.com/455423 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "455423 URLDataManagerBackend::DataAvailable"));
   // Forward this data on to the pending net::URLRequest, if it exists.
   PendingRequestMap::iterator i = pending_requests_.find(request_id);
   if (i != pending_requests_.end()) {
-    URLRequestChromeJob* job(i->second);
+    URLRequestChromeJob* job = i->second;
     pending_requests_.erase(i);
     job->DataAvailable(bytes);
   }
 }
 
 namespace {
 
 class DevToolsJobFactory
     : public net::URLRequestJobFactory::ProtocolHandler {
  public:
@@ skipping 37 matching lines @@
 
 }  // namespace
 
 net::URLRequestJobFactory::ProtocolHandler*
 CreateDevToolsProtocolHandler(content::ResourceContext* resource_context,
                               bool is_incognito) {
   return new DevToolsJobFactory(resource_context, is_incognito);
 }
 
 }  // namespace content