First pass at adding http/backend cache to NetLog

net/http/http_cache_transaction.cc

Index: net/http/http_cache_transaction.cc
===================================================================
--- net/http/http_cache_transaction.cc	(revision 68857)
+++ net/http/http_cache_transaction.cc	(working copy)
@@ -385,6 +385,10 @@
   return LOAD_STATE_WAITING_FOR_CACHE;
 }
 
+const BoundNetLog& HttpCache::Transaction::net_log() const {
+  return net_log_;
+}
+
 //-----------------------------------------------------------------------------
 
 void HttpCache::Transaction::DoCallback(int rv) {
@@ -566,13 +570,13 @@
 int HttpCache::Transaction::DoGetBackend() {
   cache_pending_ = true;
   next_state_ = STATE_GET_BACKEND_COMPLETE;
-  net_log_.BeginEvent(NetLog::TYPE_HTTP_CACHE_WAITING, NULL);
+  net_log_.BeginEvent(NetLog::TYPE_HTTP_CACHE_GET_BACKEND, NULL);
   return cache_->GetBackendForTransaction(this);
 }
 
 int HttpCache::Transaction::DoGetBackendComplete(int result) {
   DCHECK(result == OK || result == ERR_FAILED);
-  net_log_.EndEvent(NetLog::TYPE_HTTP_CACHE_WAITING, NULL);
+  net_log_.EndEventWithErrorCode(NetLog::TYPE_HTTP_CACHE_GET_BACKEND, result);
   cache_pending_ = false;
 
   if (!ShouldPassThrough()) {
@@ -746,7 +750,7 @@
   // 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_.EndEvent(NetLog::TYPE_HTTP_CACHE_OPEN_ENTRY, NULL);
+  net_log_.EndEventWithErrorCode(NetLog::TYPE_HTTP_CACHE_OPEN_ENTRY, result);
   cache_pending_ = false;
   if (result == OK) {
     next_state_ = STATE_ADD_TO_ENTRY;
@@ -789,7 +793,7 @@
   // 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_.EndEvent(NetLog::TYPE_HTTP_CACHE_CREATE_ENTRY, NULL);
+  net_log_.EndEventWithErrorCode(NetLog::TYPE_HTTP_CACHE_CREATE_ENTRY, result);
   cache_pending_ = false;
   next_state_ = STATE_ADD_TO_ENTRY;
 
@@ -820,7 +824,7 @@
 }
 
 int HttpCache::Transaction::DoDoomEntryComplete(int result) {
-  net_log_.EndEvent(NetLog::TYPE_HTTP_CACHE_DOOM_ENTRY, NULL);
+  net_log_.EndEventWithErrorCode(NetLog::TYPE_HTTP_CACHE_DOOM_ENTRY, result);
   next_state_ = STATE_CREATE_ENTRY;
   cache_pending_ = false;
   if (result == ERR_CACHE_RACE)
@@ -833,14 +837,14 @@
   DCHECK(new_entry_);
   cache_pending_ = true;
   next_state_ = STATE_ADD_TO_ENTRY_COMPLETE;
-  net_log_.BeginEvent(NetLog::TYPE_HTTP_CACHE_WAITING, NULL);
+  net_log_.BeginEvent(NetLog::TYPE_HTTP_CACHE_ADD_TO_ENTRY, NULL);
   DCHECK(entry_lock_waiting_since_.is_null());
   entry_lock_waiting_since_ = base::TimeTicks::Now();
   return cache_->AddTransactionToEntry(new_entry_, this);
 }
 
 int HttpCache::Transaction::DoAddToEntryComplete(int result) {
-  net_log_.EndEvent(NetLog::TYPE_HTTP_CACHE_WAITING, NULL);
+  net_log_.EndEventWithErrorCode(NetLog::TYPE_HTTP_CACHE_ADD_TO_ENTRY, result);
 
   const base::TimeDelta entry_lock_wait =
       base::TimeTicks::Now() - entry_lock_waiting_since_;
@@ -991,12 +995,17 @@
   cache_callback_->AddRef();  // Balanced in DoTruncateCachedDataComplete.
   if (!entry_)
     return OK;
+  if (net_log_.IsLoggingAllEvents())
+    net_log_.BeginEvent(NetLog::TYPE_HTTP_CACHE_WRITE_DATA, NULL);
 
   // Truncate the stream.
   return WriteToEntry(kResponseContentIndex, 0, NULL, 0, cache_callback_);
 }
 
 int HttpCache::Transaction::DoTruncateCachedDataComplete(int result) {
+  if (net_log_.IsLoggingAllEvents() && entry_)
+    net_log_.EndEventWithErrorCode(NetLog::TYPE_HTTP_CACHE_WRITE_DATA, result);
+
   // Balance the AddRef from DoTruncateCachedData.
   cache_callback_->Release();
   next_state_ = STATE_TRUNCATE_CACHED_METADATA;
@@ -1009,10 +1018,15 @@
   if (!entry_)
     return OK;
 
+  if (net_log_.IsLoggingAllEvents())
+    net_log_.BeginEvent(NetLog::TYPE_HTTP_CACHE_WRITE_INFO, NULL);
   return WriteToEntry(kMetadataIndex, 0, NULL, 0, cache_callback_);
 }
 
 int HttpCache::Transaction::DoTruncateCachedMetadataComplete(int result) {
+  if (net_log_.IsLoggingAllEvents() && entry_)
+    net_log_.EndEventWithErrorCode(NetLog::TYPE_HTTP_CACHE_WRITE_INFO, result);
+
   // Balance the AddRef from DoTruncateCachedMetadata.
   cache_callback_->Release();
 
@@ -1062,7 +1076,7 @@
 
 int HttpCache::Transaction::DoCacheReadResponseComplete(int result) {
   cache_callback_->Release();  // Balance the AddRef from DoCacheReadResponse.
-  net_log_.EndEvent(NetLog::TYPE_HTTP_CACHE_READ_INFO, NULL);
+  net_log_.EndEventWithErrorCode(NetLog::TYPE_HTTP_CACHE_READ_INFO, result);
   if (result != io_buf_len_ ||
       !HttpCache::ParseResponseInfo(read_buf_->data(), io_buf_len_,
                                     &response_, &truncated_)) {
@@ -1102,10 +1116,14 @@
 }
 
 int HttpCache::Transaction::DoCacheWriteResponse() {
+  if (net_log_.IsLoggingAllEvents() && entry_)
+    net_log_.BeginEvent(NetLog::TYPE_HTTP_CACHE_WRITE_INFO, NULL);
   return WriteResponseInfoToEntry(false);
 }
 
 int HttpCache::Transaction::DoCacheWriteTruncatedResponse() {
+  if (net_log_.IsLoggingAllEvents() && entry_)
+    net_log_.BeginEvent(NetLog::TYPE_HTTP_CACHE_WRITE_INFO, NULL);
   return WriteResponseInfoToEntry(true);
 }
 
@@ -1114,6 +1132,8 @@
   target_state_ = STATE_NONE;
   if (!entry_)
     return OK;
+  if (net_log_.IsLoggingAllEvents())
+    net_log_.EndEventWithErrorCode(NetLog::TYPE_HTTP_CACHE_WRITE_INFO, result);
 
   // Balance the AddRef from WriteResponseInfoToEntry.
   write_headers_callback_->Release();
@@ -1141,7 +1161,7 @@
 
 int HttpCache::Transaction::DoCacheReadMetadataComplete(int result) {
   cache_callback_->Release();  // Balance the AddRef from DoCacheReadMetadata.
-  net_log_.EndEvent(NetLog::TYPE_HTTP_CACHE_READ_INFO, NULL);
+  net_log_.EndEventWithErrorCode(NetLog::TYPE_HTTP_CACHE_READ_INFO, result);
   if (result != response_.metadata->size()) {
     DLOG(ERROR) << "ReadData failed: " << result;
     return ERR_CACHE_READ_FAILURE;
@@ -1172,6 +1192,9 @@
   DCHECK(entry_);
   next_state_ = STATE_CACHE_READ_DATA_COMPLETE;
   cache_callback_->AddRef();  // Balanced in DoCacheReadDataComplete.
+
+  if (net_log_.IsLoggingAllEvents())
+    net_log_.BeginEvent(NetLog::TYPE_HTTP_CACHE_READ_DATA, NULL);
   if (partial_.get()) {
     return partial_->CacheRead(entry_->disk_entry, read_buf_, io_buf_len_,
                                cache_callback_);
@@ -1183,6 +1206,8 @@
 
 int HttpCache::Transaction::DoCacheReadDataComplete(int result) {
   cache_callback_->Release();  // Balance the AddRef from DoCacheReadData.
+  if (net_log_.IsLoggingAllEvents())
+    net_log_.EndEventWithErrorCode(NetLog::TYPE_HTTP_CACHE_READ_DATA, result);
 
   if (!cache_)
     return ERR_UNEXPECTED;
@@ -1202,12 +1227,16 @@
 int HttpCache::Transaction::DoCacheWriteData(int num_bytes) {
   next_state_ = STATE_CACHE_WRITE_DATA_COMPLETE;
   write_len_ = num_bytes;
+  if (net_log_.IsLoggingAllEvents() && entry_)
+    net_log_.BeginEvent(NetLog::TYPE_HTTP_CACHE_WRITE_DATA, NULL);
   cache_callback_->AddRef();  // Balanced in DoCacheWriteDataComplete.
 
   return AppendResponseDataToEntry(read_buf_, num_bytes, cache_callback_);
 }
 
 int HttpCache::Transaction::DoCacheWriteDataComplete(int result) {
+  if (net_log_.IsLoggingAllEvents() && entry_)
+    net_log_.EndEventWithErrorCode(NetLog::TYPE_HTTP_CACHE_WRITE_DATA, result);
   // Balance the AddRef from DoCacheWriteData.
   cache_callback_->Release();
   if (!cache_)