Update from https://crrev.com/308996

net/http/http_cache_transaction.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 "net/http/http_cache_transaction.h"
 
 #include "build/build_config.h"
 
 #if defined(OS_POSIX)
 #include <unistd.h>
@@ skipping 985 matching lines @@
     }
   } while (rv != ERR_IO_PENDING && next_state_ != STATE_NONE);
 
   if (rv != ERR_IO_PENDING)
     HandleResult(rv);
 
   return rv;
 }
 
 int HttpCache::Transaction::DoGetBackend() {
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/422516 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "422516 HttpCache::Transaction::DoGetBackend"));
+
   cache_pending_ = true;
   next_state_ = STATE_GET_BACKEND_COMPLETE;
   net_log_.BeginEvent(NetLog::TYPE_HTTP_CACHE_GET_BACKEND);
   return cache_->GetBackendForTransaction(this);
 }
 
 int HttpCache::Transaction::DoGetBackendComplete(int result) {
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/422516 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "422516 HttpCache::Transaction::DoGetBackendComplete"));
+
   DCHECK(result == OK || result == ERR_FAILED);
   net_log_.EndEventWithNetErrorCode(NetLog::TYPE_HTTP_CACHE_GET_BACKEND,
                                     result);
   cache_pending_ = false;
 
   if (!ShouldPassThrough()) {
     cache_key_ = cache_->GenerateCacheKey(request_);
 
     // Requested cache access mode.
     if (effective_load_flags_ & LOAD_ONLY_FROM_CACHE) {
@@ skipping 45 matching lines @@
     next_state_ = STATE_INIT_ENTRY;
   }
 
   // This is only set if we have something to do with the response.
   range_requested_ = (partial_.get() != NULL);
 
   return OK;
 }
 
 int HttpCache::Transaction::DoSendRequest() {
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/422516 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "422516 HttpCache::Transaction::DoSendRequest"));
+
   DCHECK(mode_ & WRITE || mode_ == NONE);
   DCHECK(!network_trans_.get());
 
   send_request_since_ = TimeTicks::Now();
 
   // Create a network transaction.
   int rv = cache_->network_layer_->CreateTransaction(priority_,
                                                      &network_trans_);
   if (rv != OK)
     return rv;
   network_trans_->SetBeforeNetworkStartCallback(before_network_start_callback_);
   network_trans_->SetBeforeProxyHeadersSentCallback(
       before_proxy_headers_sent_callback_);
 
   // Old load timing information, if any, is now obsolete.
   old_network_trans_load_timing_.reset();
 
   if (websocket_handshake_stream_base_create_helper_)
     network_trans_->SetWebSocketHandshakeStreamCreateHelper(
         websocket_handshake_stream_base_create_helper_);
 
   next_state_ = STATE_SEND_REQUEST_COMPLETE;
   rv = network_trans_->Start(request_, io_callback_, net_log_);
   return rv;
 }
 
 int HttpCache::Transaction::DoSendRequestComplete(int result) {
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/422516 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "422516 HttpCache::Transaction::DoSendRequestComplete"));
+
   if (!cache_.get())
     return ERR_UNEXPECTED;
 
   // If requested, and we have a readable cache entry, and we have
   // an error indicating that we're offline as opposed to in contact
   // with a bad server, read from cache anyway.
   if (IsOfflineError(result)) {
     if (mode_ == READ_WRITE && entry_ && !partial_) {
       RecordOfflineStatus(effective_load_flags_,
                           OFFLINE_STATUS_DATA_AVAILABLE_OFFLINE);
@@ skipping 35 matching lines @@
     DCHECK(response);
     response_.cert_request_info = response->cert_request_info;
   } else if (response_.was_cached) {
     DoneWritingToEntry(true);
   }
   return result;
 }
 
 // We received the response headers and there is no error.
 int HttpCache::Transaction::DoSuccessfulSendRequest() {
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/422516 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "422516 HttpCache::Transaction::DoSuccessfulSendRequest"));
+
   DCHECK(!new_response_);
   const HttpResponseInfo* new_response = network_trans_->GetResponseInfo();
   bool authentication_failure = false;
 
   if (new_response->headers->response_code() == 401 ||
       new_response->headers->response_code() == 407) {
     auth_response_ = *new_response;
     if (!reading_)
       return OK;
 
@@ skipping 81 matching lines @@
     }
     UpdateTransactionPattern(PATTERN_ENTRY_UPDATED);
     mode_ = WRITE;
   }
 
   next_state_ = STATE_OVERWRITE_CACHED_RESPONSE;
   return OK;
 }
 
 int HttpCache::Transaction::DoNetworkRead() {
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/422516 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "422516 HttpCache::Transaction::DoNetworkRead"));
+
   next_state_ = STATE_NETWORK_READ_COMPLETE;
   return network_trans_->Read(read_buf_.get(), io_buf_len_, io_callback_);
 }
 
 int HttpCache::Transaction::DoNetworkReadComplete(int result) {
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/422516 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "422516 HttpCache::Transaction::DoNetworkReadComplete"));
+
   DCHECK(mode_ & WRITE || mode_ == NONE);
 
   if (!cache_.get())
     return ERR_UNEXPECTED;
 
   // If there is an error or we aren't saving the data, we are done; just wait
   // until the destructor runs to see if we can keep the data.
   if (mode_ == NONE || result < 0)
     return result;
 
   next_state_ = STATE_CACHE_WRITE_DATA;
   return result;
 }
 
 int HttpCache::Transaction::DoInitEntry() {
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/422516 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "422516 HttpCache::Transaction::DoInitEntry"));
+
   DCHECK(!new_entry_);
 
   if (!cache_.get())
     return ERR_UNEXPECTED;
 
   if (mode_ == WRITE) {
     next_state_ = STATE_DOOM_ENTRY;
     return OK;
   }
 
   next_state_ = STATE_OPEN_ENTRY;
   return OK;
 }
 
 int HttpCache::Transaction::DoOpenEntry() {
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/422516 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "422516 HttpCache::Transaction::DoOpenEntry"));
+
   DCHECK(!new_entry_);
   next_state_ = STATE_OPEN_ENTRY_COMPLETE;
   cache_pending_ = true;
   net_log_.BeginEvent(NetLog::TYPE_HTTP_CACHE_OPEN_ENTRY);
   first_cache_access_since_ = TimeTicks::Now();
   return cache_->OpenEntry(cache_key_, &new_entry_, this);
 }
 
 int HttpCache::Transaction::DoOpenEntryComplete(int result) {
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/422516 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "422516 HttpCache::Transaction::DoOpenEntryComplete"));
+
   // It is important that we go to STATE_ADD_TO_ENTRY whenever the result is
   // OK, otherwise the cache will end up with an active entry without any
   // transaction attached.
   net_log_.EndEventWithNetErrorCode(NetLog::TYPE_HTTP_CACHE_OPEN_ENTRY, result);
   cache_pending_ = false;
   if (result == OK) {
     next_state_ = STATE_ADD_TO_ENTRY;
     return OK;
   }
 
@@ skipping 23 matching lines @@
   }
   if (cache_->mode() == PLAYBACK)
     DVLOG(1) << "Playback Cache Miss: " << request_->url;
 
   // The entry does not exist, and we are not permitted to create a new entry,
   // so we must fail.
   return ERR_CACHE_MISS;
 }
 
 int HttpCache::Transaction::DoCreateEntry() {
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/422516 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "422516 HttpCache::Transaction::DoCreateEntry"));
+
   DCHECK(!new_entry_);
   next_state_ = STATE_CREATE_ENTRY_COMPLETE;
   cache_pending_ = true;
   net_log_.BeginEvent(NetLog::TYPE_HTTP_CACHE_CREATE_ENTRY);
   return cache_->CreateEntry(cache_key_, &new_entry_, this);
 }
 
 int HttpCache::Transaction::DoCreateEntryComplete(int result) {
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/422516 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "422516 HttpCache::Transaction::DoCreateEntryComplete"));
+
   // It is important that we go to STATE_ADD_TO_ENTRY whenever the result is
   // OK, otherwise the cache will end up with an active entry without any
   // transaction attached.
   net_log_.EndEventWithNetErrorCode(NetLog::TYPE_HTTP_CACHE_CREATE_ENTRY,
                                     result);
   cache_pending_ = false;
   next_state_ = STATE_ADD_TO_ENTRY;
 
   if (result == ERR_CACHE_RACE) {
     next_state_ = STATE_INIT_ENTRY;
     return OK;
   }
 
   if (result != OK) {
     // We have a race here: Maybe we failed to open the entry and decided to
     // create one, but by the time we called create, another transaction already
     // created the entry. If we want to eliminate this issue, we need an atomic
     // OpenOrCreate() method exposed by the disk cache.
     DLOG(WARNING) << "Unable to create cache entry";
     mode_ = NONE;
     if (partial_.get())
       partial_->RestoreHeaders(&custom_request_->extra_headers);
     next_state_ = STATE_SEND_REQUEST;
   }
   return OK;
 }
 
 int HttpCache::Transaction::DoDoomEntry() {
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/422516 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "422516 HttpCache::Transaction::DoDoomEntry"));
+
   next_state_ = STATE_DOOM_ENTRY_COMPLETE;
   cache_pending_ = true;
   if (first_cache_access_since_.is_null())
     first_cache_access_since_ = TimeTicks::Now();
   net_log_.BeginEvent(NetLog::TYPE_HTTP_CACHE_DOOM_ENTRY);
   return cache_->DoomEntry(cache_key_, this);
 }
 
 int HttpCache::Transaction::DoDoomEntryComplete(int result) {
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/422516 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "422516 HttpCache::Transaction::DoDoomEntryComplete"));
+
   net_log_.EndEventWithNetErrorCode(NetLog::TYPE_HTTP_CACHE_DOOM_ENTRY, result);
   next_state_ = STATE_CREATE_ENTRY;
   cache_pending_ = false;
   if (result == ERR_CACHE_RACE)
     next_state_ = STATE_INIT_ENTRY;
   return OK;
 }
 
 int HttpCache::Transaction::DoAddToEntry() {
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/422516 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "422516 HttpCache::Transaction::DoAddToEntry"));
+
   DCHECK(new_entry_);
   cache_pending_ = true;
   next_state_ = STATE_ADD_TO_ENTRY_COMPLETE;
   net_log_.BeginEvent(NetLog::TYPE_HTTP_CACHE_ADD_TO_ENTRY);
   DCHECK(entry_lock_waiting_since_.is_null());
   entry_lock_waiting_since_ = TimeTicks::Now();
   int rv = cache_->AddTransactionToEntry(new_entry_, this);
   if (rv == ERR_IO_PENDING) {
     if (bypass_lock_for_test_) {
       OnAddToEntryTimeout(entry_lock_waiting_since_);
@@ skipping 21 matching lines @@
           FROM_HERE,
           base::Bind(&HttpCache::Transaction::OnAddToEntryTimeout,
                      weak_factory_.GetWeakPtr(), entry_lock_waiting_since_),
           TimeDelta::FromMilliseconds(timeout_milliseconds));
     }
   }
   return rv;
 }
 
 int HttpCache::Transaction::DoAddToEntryComplete(int result) {
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/422516 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "422516 HttpCache::Transaction::DoAddToEntryComplete"));
+
   net_log_.EndEventWithNetErrorCode(NetLog::TYPE_HTTP_CACHE_ADD_TO_ENTRY,
                                     result);
   const TimeDelta entry_lock_wait =
       TimeTicks::Now() - entry_lock_waiting_since_;
   UMA_HISTOGRAM_TIMES("HttpCache.EntryLockWait", entry_lock_wait);
 
   entry_lock_waiting_since_ = TimeTicks();
   DCHECK(new_entry_);
   cache_pending_ = false;
 
@@ skipping 31 matching lines @@
   } else {
     // We have to read the headers from the cached entry.
     DCHECK(mode_ & READ_META);
     next_state_ = STATE_CACHE_READ_RESPONSE;
   }
   return OK;
 }
 
 // We may end up here multiple times for a given request.
 int HttpCache::Transaction::DoStartPartialCacheValidation() {
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/422516 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "422516 HttpCache::Transaction::DoStartPartialCacheValidation"));
+
   if (mode_ == NONE)
     return OK;
 
   next_state_ = STATE_COMPLETE_PARTIAL_CACHE_VALIDATION;
   return partial_->ShouldValidateCache(entry_->disk_entry, io_callback_);
 }
 
 int HttpCache::Transaction::DoCompletePartialCacheValidation(int result) {
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/422516 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "422516 HttpCache::Transaction::DoCompletePartialCacheValidation"));
+
   if (!result) {
     // This is the end of the request.
     if (mode_ & WRITE) {
       DoneWritingToEntry(true);
     } else {
       cache_->DoneReadingFromEntry(entry_, this);
       entry_ = NULL;
     }
     return result;
   }
 
   if (result < 0)
     return result;
 
   partial_->PrepareCacheValidation(entry_->disk_entry,
                                    &custom_request_->extra_headers);
 
   if (reading_ && partial_->IsCurrentRangeCached()) {
     next_state_ = STATE_CACHE_READ_DATA;
     return OK;
   }
 
   return BeginCacheValidation();
 }
 
 // We received 304 or 206 and we want to update the cached response headers.
 int HttpCache::Transaction::DoUpdateCachedResponse() {
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/422516 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "422516 HttpCache::Transaction::DoUpdateCachedResponse"));
+
   next_state_ = STATE_UPDATE_CACHED_RESPONSE_COMPLETE;
   int rv = OK;
   // Update cached response based on headers in new_response.
   // TODO(wtc): should we update cached certificate (response_.ssl_info), too?
   response_.headers->Update(*new_response_->headers.get());
   response_.response_time = new_response_->response_time;
   response_.request_time = new_response_->request_time;
   response_.network_accessed = new_response_->network_accessed;
 
   if (response_.headers->HasHeaderValue("cache-control", "no-store")) {
     if (!entry_->doomed) {
       int ret = cache_->DoomEntry(cache_key_, NULL);
       DCHECK_EQ(OK, ret);
     }
   } else {
     // If we are already reading, we already updated the headers for this
     // request; doing it again will change Content-Length.
     if (!reading_) {
       target_state_ = STATE_UPDATE_CACHED_RESPONSE_COMPLETE;
       next_state_ = STATE_CACHE_WRITE_RESPONSE;
       rv = OK;
     }
   }
   return rv;
 }
 
 int HttpCache::Transaction::DoUpdateCachedResponseComplete(int result) {
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/422516 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "422516 HttpCache::Transaction::DoUpdateCachedResponseComplete"));
+
   if (mode_ == UPDATE) {
     DCHECK(!handling_206_);
     // We got a "not modified" response and already updated the corresponding
     // cache entry above.
     //
     // By closing the cached entry now, we make sure that the 304 rather than
     // the cached 200 response, is what will be returned to the user.
     DoneWritingToEntry(true);
   } else if (entry_ && !handling_206_) {
     DCHECK_EQ(READ_WRITE, mode_);
@@ skipping 13 matching lines @@
     new_response_ = NULL;
     next_state_ = STATE_START_PARTIAL_CACHE_VALIDATION;
     partial_->SetRangeToStartDownload();
     return OK;
   }
   next_state_ = STATE_OVERWRITE_CACHED_RESPONSE;
   return OK;
 }
 
 int HttpCache::Transaction::DoOverwriteCachedResponse() {
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/422516 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "422516 HttpCache::Transaction::DoOverwriteCachedResponse"));
+
   if (mode_ & READ) {
     next_state_ = STATE_PARTIAL_HEADERS_RECEIVED;
     return OK;
   }
 
   // We change the value of Content-Length for partial content.
   if (handling_206_ && partial_.get())
     partial_->FixContentLength(new_response_->headers.get());
 
   response_ = *new_response_;
 
   if (request_->method == "HEAD") {
     // This response is replacing the cached one.
     DoneWritingToEntry(false);
     mode_ = NONE;
     new_response_ = NULL;
     return OK;
   }
 
   target_state_ = STATE_TRUNCATE_CACHED_DATA;
   next_state_ = truncated_ ? STATE_CACHE_WRITE_TRUNCATED_RESPONSE :
                              STATE_CACHE_WRITE_RESPONSE;
   return OK;
 }
 
 int HttpCache::Transaction::DoTruncateCachedData() {
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/422516 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "422516 HttpCache::Transaction::DoTruncateCachedData"));
+
   next_state_ = STATE_TRUNCATE_CACHED_DATA_COMPLETE;
   if (!entry_)
     return OK;
   if (net_log_.IsLogging())
     net_log_.BeginEvent(NetLog::TYPE_HTTP_CACHE_WRITE_DATA);
   // Truncate the stream.
   return WriteToEntry(kResponseContentIndex, 0, NULL, 0, io_callback_);
 }
 
 int HttpCache::Transaction::DoTruncateCachedDataComplete(int result) {
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/422516 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "422516 HttpCache::Transaction::DoTruncateCachedDataComplete"));
+
   if (entry_) {
     if (net_log_.IsLogging()) {
       net_log_.EndEventWithNetErrorCode(NetLog::TYPE_HTTP_CACHE_WRITE_DATA,
                                         result);
     }
   }
 
   next_state_ = STATE_TRUNCATE_CACHED_METADATA;
   return OK;
 }
 
 int HttpCache::Transaction::DoTruncateCachedMetadata() {
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/422516 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "422516 HttpCache::Transaction::DoTruncateCachedMetadata"));
+
   next_state_ = STATE_TRUNCATE_CACHED_METADATA_COMPLETE;
   if (!entry_)
     return OK;
 
   if (net_log_.IsLogging())
     net_log_.BeginEvent(NetLog::TYPE_HTTP_CACHE_WRITE_INFO);
   return WriteToEntry(kMetadataIndex, 0, NULL, 0, io_callback_);
 }
 
 int HttpCache::Transaction::DoTruncateCachedMetadataComplete(int result) {
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/422516 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "422516 HttpCache::Transaction::DoTruncateCachedMetadataComplete"));
+
   if (entry_) {
     if (net_log_.IsLogging()) {
       net_log_.EndEventWithNetErrorCode(NetLog::TYPE_HTTP_CACHE_WRITE_INFO,
                                         result);
     }
   }
 
   next_state_ = STATE_PARTIAL_HEADERS_RECEIVED;
   return OK;
 }
 
 int HttpCache::Transaction::DoPartialHeadersReceived() {
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/422516 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "422516 HttpCache::Transaction::DoPartialHeadersReceived"));
+
   new_response_ = NULL;
   if (entry_ && !partial_.get() &&
       entry_->disk_entry->GetDataSize(kMetadataIndex))
     next_state_ = STATE_CACHE_READ_METADATA;
 
   if (!partial_.get())
     return OK;
 
   if (reading_) {
     if (network_trans_.get()) {
       next_state_ = STATE_NETWORK_READ;
     } else {
       next_state_ = STATE_CACHE_READ_DATA;
     }
   } else if (mode_ != NONE) {
     // We are about to return the headers for a byte-range request to the user,
     // so let's fix them.
     partial_->FixResponseHeaders(response_.headers.get(), true);
   }
   return OK;
 }
 
 int HttpCache::Transaction::DoCacheReadResponse() {
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/422516 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "422516 HttpCache::Transaction::DoCacheReadResponse"));
+
   DCHECK(entry_);
   next_state_ = STATE_CACHE_READ_RESPONSE_COMPLETE;
 
   io_buf_len_ = entry_->disk_entry->GetDataSize(kResponseInfoIndex);
   read_buf_ = new IOBuffer(io_buf_len_);
 
   net_log_.BeginEvent(NetLog::TYPE_HTTP_CACHE_READ_INFO);
   return entry_->disk_entry->ReadData(kResponseInfoIndex, 0, read_buf_.get(),
                                       io_buf_len_, io_callback_);
 }
 
 int HttpCache::Transaction::DoCacheReadResponseComplete(int result) {
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/422516 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "422516 HttpCache::Transaction::DoCacheReadResponseComplete"));
+
   net_log_.EndEventWithNetErrorCode(NetLog::TYPE_HTTP_CACHE_READ_INFO, result);
   if (result != io_buf_len_ ||
       !HttpCache::ParseResponseInfo(read_buf_->data(), io_buf_len_,
                                     &response_, &truncated_)) {
     return OnCacheReadError(result, true);
   }
 
   // cert_cache() will be null if the CertCacheTrial field trial is disabled.
   if (cache_->cert_cache() && response_.ssl_info.is_valid())
     ReadCertChain();
@@ skipping 29 matching lines @@
       break;
     case WRITE:
     default:
       NOTREACHED();
       result = ERR_FAILED;
   }
   return result;
 }
 
 int HttpCache::Transaction::DoCacheWriteResponse() {
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/422516 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "422516 HttpCache::Transaction::DoCacheWriteResponse"));
+
   if (entry_) {
     if (net_log_.IsLogging())
       net_log_.BeginEvent(NetLog::TYPE_HTTP_CACHE_WRITE_INFO);
   }
   return WriteResponseInfoToEntry(false);
 }
 
 int HttpCache::Transaction::DoCacheWriteTruncatedResponse() {
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/422516 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "422516 HttpCache::Transaction::DoCacheWriteTruncatedResponse"));
+
   if (entry_) {
     if (net_log_.IsLogging())
       net_log_.BeginEvent(NetLog::TYPE_HTTP_CACHE_WRITE_INFO);
   }
   return WriteResponseInfoToEntry(true);
 }
 
 int HttpCache::Transaction::DoCacheWriteResponseComplete(int result) {
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/422516 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "422516 HttpCache::Transaction::DoCacheWriteResponseComplete"));
+
   next_state_ = target_state_;
   target_state_ = STATE_NONE;
   if (!entry_)
     return OK;
   if (net_log_.IsLogging()) {
     net_log_.EndEventWithNetErrorCode(NetLog::TYPE_HTTP_CACHE_WRITE_INFO,
                                       result);
   }
 
   // Balance the AddRef from WriteResponseInfoToEntry.
   if (result != io_buf_len_) {
     DLOG(ERROR) << "failed to write response info to cache";
     DoneWritingToEntry(false);
   }
   return OK;
 }
 
 int HttpCache::Transaction::DoCacheReadMetadata() {
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/422516 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "422516 HttpCache::Transaction::DoCacheReadMetadata"));
+
   DCHECK(entry_);
   DCHECK(!response_.metadata.get());
   next_state_ = STATE_CACHE_READ_METADATA_COMPLETE;
 
   response_.metadata =
       new IOBufferWithSize(entry_->disk_entry->GetDataSize(kMetadataIndex));
 
   net_log_.BeginEvent(NetLog::TYPE_HTTP_CACHE_READ_INFO);
   return entry_->disk_entry->ReadData(kMetadataIndex, 0,
                                       response_.metadata.get(),
                                       response_.metadata->size(),
                                       io_callback_);
 }
 
 int HttpCache::Transaction::DoCacheReadMetadataComplete(int result) {
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/422516 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "422516 HttpCache::Transaction::DoCacheReadMetadataComplete"));
+
   net_log_.EndEventWithNetErrorCode(NetLog::TYPE_HTTP_CACHE_READ_INFO, result);
   if (result != response_.metadata->size())
     return OnCacheReadError(result, false);
   return OK;
 }
 
 int HttpCache::Transaction::DoCacheQueryData() {
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/422516 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "422516 HttpCache::Transaction::DoCacheQueryData"));
+
   next_state_ = STATE_CACHE_QUERY_DATA_COMPLETE;
   return entry_->disk_entry->ReadyForSparseIO(io_callback_);
 }
 
 int HttpCache::Transaction::DoCacheQueryDataComplete(int result) {
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/422516 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "422516 HttpCache::Transaction::DoCacheQueryDataComplete"));
+
   if (result == ERR_NOT_IMPLEMENTED) {
     // Restart the request overwriting the cache entry.
     // TODO(pasko): remove this workaround as soon as the SimpleBackendImpl
     // supports Sparse IO.
     return DoRestartPartialRequest();
   }
   DCHECK_EQ(OK, result);
   if (!cache_.get())
     return ERR_UNEXPECTED;
 
   return ValidateEntryHeadersAndContinue();
 }
 
 int HttpCache::Transaction::DoCacheReadData() {
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/422516 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "422516 HttpCache::Transaction::DoCacheReadData"));
+
   DCHECK(entry_);
   next_state_ = STATE_CACHE_READ_DATA_COMPLETE;
 
   if (net_log_.IsLogging())
     net_log_.BeginEvent(NetLog::TYPE_HTTP_CACHE_READ_DATA);
   if (partial_.get()) {
     return partial_->CacheRead(entry_->disk_entry, read_buf_.get(), io_buf_len_,
                                io_callback_);
   }
 
   return entry_->disk_entry->ReadData(kResponseContentIndex, read_offset_,
                                       read_buf_.get(), io_buf_len_,
                                       io_callback_);
 }
 
 int HttpCache::Transaction::DoCacheReadDataComplete(int result) {
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/422516 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "422516 HttpCache::Transaction::DoCacheReadDataComplete"));
+
   if (net_log_.IsLogging()) {
     net_log_.EndEventWithNetErrorCode(NetLog::TYPE_HTTP_CACHE_READ_DATA,
                                       result);
   }
 
   if (!cache_.get())
     return ERR_UNEXPECTED;
 
   if (partial_.get()) {
     // Partial requests are confusing to report in histograms because they may
     // have multiple underlying requests.
     UpdateTransactionPattern(PATTERN_NOT_COVERED);
     return DoPartialCacheReadCompleted(result);
   }
 
   if (result > 0) {
     read_offset_ += result;
   } else if (result == 0) {  // End of file.
     RecordHistograms();
     cache_->DoneReadingFromEntry(entry_, this);
     entry_ = NULL;
   } else {
     return OnCacheReadError(result, false);
   }
   return result;
 }
 
 int HttpCache::Transaction::DoCacheWriteData(int num_bytes) {
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/422516 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "422516 HttpCache::Transaction::DoCacheWriteData"));
+
   next_state_ = STATE_CACHE_WRITE_DATA_COMPLETE;
   write_len_ = num_bytes;
   if (entry_) {
     if (net_log_.IsLogging())
       net_log_.BeginEvent(NetLog::TYPE_HTTP_CACHE_WRITE_DATA);
   }
 
   return AppendResponseDataToEntry(read_buf_.get(), num_bytes, io_callback_);
 }
 
 int HttpCache::Transaction::DoCacheWriteDataComplete(int result) {
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/422516 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "422516 HttpCache::Transaction::DoCacheWriteDataComplete"));
+
   if (entry_) {
     if (net_log_.IsLogging()) {
       net_log_.EndEventWithNetErrorCode(NetLog::TYPE_HTTP_CACHE_WRITE_DATA,
                                         result);
     }
   }
   // Balance the AddRef from DoCacheWriteData.
   if (!cache_.get())
     return ERR_UNEXPECTED;
 
@@ skipping 1069 matching lines @@
 
 void HttpCache::Transaction::OnIOComplete(int result) {
   // TODO(vadimt): Remove ScopedTracker below once crbug.com/422516 is fixed.
   tracked_objects::ScopedTracker tracking_profile(
       FROM_HERE_WITH_EXPLICIT_FUNCTION("422516 Transaction::OnIOComplete"));
 
   DoLoop(result);
 }
 
 }  // namespace net