Update from https://crrev.com/304418

net/url_request/sdch_dictionary_fetcher.cc

Index: net/url_request/sdch_dictionary_fetcher.cc
diff --git a/net/url_request/sdch_dictionary_fetcher.cc b/net/url_request/sdch_dictionary_fetcher.cc
index 580619312c8ef646ef9d469b4fccdb1691c60dd6..5ac65efc96df2813918c298a7c41d1919d54d015 100644
--- a/net/url_request/sdch_dictionary_fetcher.cc
+++ b/net/url_request/sdch_dictionary_fetcher.cc
@@ -11,6 +11,7 @@
 #include "base/compiler_specific.h"
 #include "base/thread_task_runner_handle.h"
 #include "net/base/load_flags.h"
+#include "net/base/sdch_net_log_params.h"
 #include "net/url_request/url_request_context.h"
 #include "net/url_request/url_request_status.h"
 #include "net/url_request/url_request_throttler_manager.h"
@@ -45,16 +46,15 @@ void SdchDictionaryFetcher::Schedule(const GURL& dictionary_url) {
   // Avoid pushing duplicate copy onto queue. We may fetch this url again later
   // and get a different dictionary, but there is no reason to have it in the
   // queue twice at one time.
-  if (!fetch_queue_.empty() && fetch_queue_.back() == dictionary_url) {
+  if ((!fetch_queue_.empty() && fetch_queue_.back() == dictionary_url) ||
+      attempted_load_.find(dictionary_url) != attempted_load_.end()) {
+    // TODO(rdsmith): log this error to the net log of the URLRequest
+    // initiating this fetch, once URLRequest will be passed here.
     SdchManager::SdchErrorRecovery(
-        SdchManager::DICTIONARY_ALREADY_SCHEDULED_TO_DOWNLOAD);
-    return;
-  }
-  if (attempted_load_.find(dictionary_url) != attempted_load_.end()) {
-    SdchManager::SdchErrorRecovery(
-        SdchManager::DICTIONARY_ALREADY_TRIED_TO_DOWNLOAD);
+        SDCH_DICTIONARY_PREVIOUSLY_SCHEDULED_TO_DOWNLOAD);
     return;
   }
+
   attempted_load_.insert(dictionary_url);
   fetch_queue_.push(dictionary_url);
 
@@ -166,6 +166,7 @@ int SdchDictionaryFetcher::DoDispatchRequest(int rv) {
 
   next_state_ = STATE_REQUEST_STARTED;
   current_request_->Start();
+  current_request_->net_log().AddEvent(NetLog::TYPE_SDCH_DICTIONARY_FETCH);
 
   return OK;
 }
@@ -207,7 +208,12 @@ int SdchDictionaryFetcher::DoRead(int rv) {
       // an infinite loop.  It's not clear how to handle a read failure
       // without a promise to invoke the callback at some point in the future,
       // so the request is failed.
-      SdchManager::SdchErrorRecovery(SdchManager::DICTIONARY_FETCH_READ_FAILED);
+      SdchManager::SdchErrorRecovery(SDCH_DICTIONARY_FETCH_READ_FAILED);
+      current_request_->net_log().AddEvent(
+          NetLog::TYPE_SDCH_DICTIONARY_ERROR,
+          base::Bind(&NetLogSdchDictionaryFetchProblemCallback,
+                     SDCH_DICTIONARY_FETCH_READ_FAILED, current_request_->url(),
+                     true));
       DLOG(FATAL)
           << "URLRequest::Read() returned false without IO pending or error!";
       return ERR_FAILED;
@@ -228,8 +234,10 @@ int SdchDictionaryFetcher::DoCompleteRequest(int rv) {
   DCHECK(CalledOnValidThread());
 
   // If the dictionary was successfully fetched, add it to the manager.
-  if (rv == OK)
-    dictionary_fetched_callback_.Run(dictionary_, current_request_->url());
+  if (rv == OK) {
+    dictionary_fetched_callback_.Run(dictionary_, current_request_->url(),
+                                     current_request_->net_log());
+  }
 
   current_request_.reset();
   buffer_ = NULL;