[NOT FOR LANDING] Detailed loading traces

net/http/http_cache_transaction.cc

Index: net/http/http_cache_transaction.cc
diff --git a/net/http/http_cache_transaction.cc b/net/http/http_cache_transaction.cc
index 38da8f3bd7b0fc8a7492cef49a0666fd027c8668..baa68d6e27962f02d7ad17df6fc1bdc7e9f51a75 100644
--- a/net/http/http_cache_transaction.cc
+++ b/net/http/http_cache_transaction.cc
@@ -13,6 +13,7 @@
 #include <algorithm>
 #include <string>
 
+#include "base/trace_event/trace_event.h"
 #include "base/bind.h"
 #include "base/callback_helpers.h"
 #include "base/compiler_specific.h"
@@ -179,6 +180,8 @@ HttpCache::Transaction::Transaction(RequestPriority priority, HttpCache* cache)
 }
 
 HttpCache::Transaction::~Transaction() {
+  TRACE_EVENT0("toplevel", "HttpCache::Transaction::~Transaction");
+
   // We may have to issue another IO, but we should never invoke the callback_
   // after this point.
   callback_.Reset();
@@ -867,6 +870,7 @@ int HttpCache::Transaction::DoLoop(int result) {
 }
 
 int HttpCache::Transaction::DoGetBackend() {
+  TRACE_EVENT0("toplevel", "HttpCache::Transaction::DoGetBackend");
   cache_pending_ = true;
   next_state_ = STATE_GET_BACKEND_COMPLETE;
   net_log_.BeginEvent(NetLog::TYPE_HTTP_CACHE_GET_BACKEND);
@@ -874,6 +878,7 @@ int HttpCache::Transaction::DoGetBackend() {
 }
 
 int HttpCache::Transaction::DoGetBackendComplete(int result) {
+  TRACE_EVENT0("toplevel", "HttpCache::Transaction::DoGetBackendComplete");
   DCHECK(result == OK || result == ERR_FAILED);
   net_log_.EndEventWithNetErrorCode(NetLog::TYPE_HTTP_CACHE_GET_BACKEND,
                                     result);
@@ -939,6 +944,7 @@ int HttpCache::Transaction::DoGetBackendComplete(int result) {
 }
 
 int HttpCache::Transaction::DoInitEntry() {
+  TRACE_EVENT0("toplevel", "HttpCache::Transaction::DoInitEntry");
   DCHECK(!new_entry_);
 
   if (!cache_.get())
@@ -954,6 +960,7 @@ int HttpCache::Transaction::DoInitEntry() {
 }
 
 int HttpCache::Transaction::DoOpenEntry() {
+  TRACE_EVENT0("toplevel", "HttpCache::Transaction::DoOpenEntry");
   DCHECK(!new_entry_);
   next_state_ = STATE_OPEN_ENTRY_COMPLETE;
   cache_pending_ = true;
@@ -963,6 +970,7 @@ int HttpCache::Transaction::DoOpenEntry() {
 }
 
 int HttpCache::Transaction::DoOpenEntryComplete(int result) {
+  TRACE_EVENT0("toplevel", "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.
@@ -1060,6 +1068,7 @@ int HttpCache::Transaction::DoCreateEntryComplete(int result) {
 }
 
 int HttpCache::Transaction::DoAddToEntry() {
+  TRACE_EVENT0("toplevel", "HttpCache::Transaction::DoAddToEntry");
   DCHECK(new_entry_);
   cache_pending_ = true;
   next_state_ = STATE_ADD_TO_ENTRY_COMPLETE;
@@ -1101,6 +1110,7 @@ int HttpCache::Transaction::DoAddToEntry() {
 }
 
 int HttpCache::Transaction::DoAddToEntryComplete(int result) {
+  TRACE_EVENT0("toplevel", "HttpCache::Transaction::DoAddToEntryComplete");
   net_log_.EndEventWithNetErrorCode(NetLog::TYPE_HTTP_CACHE_ADD_TO_ENTRY,
                                     result);
   const TimeDelta entry_lock_wait =
@@ -1151,6 +1161,7 @@ int HttpCache::Transaction::DoAddToEntryComplete(int result) {
 }
 
 int HttpCache::Transaction::DoCacheReadResponse() {
+  TRACE_EVENT0("toplevel", "HttpCache::Transaction::DoCacheReadResponse");
   DCHECK(entry_);
   next_state_ = STATE_CACHE_READ_RESPONSE_COMPLETE;
 
@@ -1163,6 +1174,8 @@ int HttpCache::Transaction::DoCacheReadResponse() {
 }
 
 int HttpCache::Transaction::DoCacheReadResponseComplete(int result) {
+  TRACE_EVENT0("toplevel",
+               "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_,