Modified cancel and interrupt processing to avoid race with history.

content/browser/net/url_request_slow_download_job.cc

Index: content/browser/net/url_request_slow_download_job.cc
diff --git a/content/browser/net/url_request_slow_download_job.cc b/content/browser/net/url_request_slow_download_job.cc
index ef1370ff32329b41538af42a002002efbe73ef68..87584b092f8cea6ffa930bace47644cd8d55b72d 100644
--- a/content/browser/net/url_request_slow_download_job.cc
+++ b/content/browser/net/url_request_slow_download_job.cc
@@ -10,9 +10,11 @@
 #include "base/string_util.h"
 #include "googleurl/src/gurl.h"
 #include "net/base/io_buffer.h"
+#include "net/base/net_errors.h"
 #include "net/http/http_response_headers.h"
 #include "net/url_request/url_request.h"
 #include "net/url_request/url_request_filter.h"
+#include "net/url_request/url_request_status.h"
 
 const int kFirstDownloadSize = 1024 * 35;
 const int kSecondDownloadSize = 1024 * 10;
@@ -23,10 +25,21 @@ const char URLRequestSlowDownloadJob::kKnownSizeUrl[] =
   "http://url.handled.by.slow.download/download-known-size";
 const char URLRequestSlowDownloadJob::kFinishDownloadUrl[] =
   "http://url.handled.by.slow.download/download-finish";
+const char URLRequestSlowDownloadJob::kErrorFinishDownloadUrl[] =
+  "http://url.handled.by.slow.download/download-error";
 
 std::vector<URLRequestSlowDownloadJob*>
     URLRequestSlowDownloadJob::kPendingRequests;
 
+// Return whether this is the finish or error URL
+static bool IsCompletionUrl(GURL url) {
+  return (LowerCaseEqualsASCII(
+      URLRequestSlowDownloadJob::kFinishDownloadUrl, url.spec().c_str()) ||
+          LowerCaseEqualsASCII(
+              URLRequestSlowDownloadJob::kErrorFinishDownloadUrl,
+              url.spec().c_str()));
+}
+
 void URLRequestSlowDownloadJob::Start() {
   MessageLoop::current()->PostTask(
       FROM_HERE,
@@ -43,6 +56,8 @@ void URLRequestSlowDownloadJob::AddUrlHandler() {
                         &URLRequestSlowDownloadJob::Factory);
   filter->AddUrlHandler(GURL(kFinishDownloadUrl),
                         &URLRequestSlowDownloadJob::Factory);
+  filter->AddUrlHandler(GURL(kErrorFinishDownloadUrl),
+                        &URLRequestSlowDownloadJob::Factory);
 }
 
 /*static */
@@ -50,17 +65,21 @@ net::URLRequestJob* URLRequestSlowDownloadJob::Factory(
     net::URLRequest* request,
     const std::string& scheme) {
   URLRequestSlowDownloadJob* job = new URLRequestSlowDownloadJob(request);
-  if (request->url().spec() != kFinishDownloadUrl)
+  if (!IsCompletionUrl(request->url()))
     URLRequestSlowDownloadJob::kPendingRequests.push_back(job);
   return job;
 }
 
 /* static */
-void URLRequestSlowDownloadJob::FinishPendingRequests() {
+void URLRequestSlowDownloadJob::FinishPendingRequests(bool error) {
   typedef std::vector<URLRequestSlowDownloadJob*> JobList;
   for (JobList::iterator it = kPendingRequests.begin(); it !=
        kPendingRequests.end(); ++it) {
-    (*it)->set_should_finish_download();
+    if (error) {
+      (*it)->set_should_error_download();
+    } else {
+      (*it)->set_should_finish_download();
+    }
   }
   kPendingRequests.clear();
 }
@@ -70,19 +89,24 @@ URLRequestSlowDownloadJob::URLRequestSlowDownloadJob(net::URLRequest* request)
       first_download_size_remaining_(kFirstDownloadSize),
       should_finish_download_(false),
       should_send_second_chunk_(false),
+      should_error_download_(false),
       ALLOW_THIS_IN_INITIALIZER_LIST(method_factory_(this)) {}
 
 void URLRequestSlowDownloadJob::StartAsync() {
   if (LowerCaseEqualsASCII(kFinishDownloadUrl, request_->url().spec().c_str()))
-    URLRequestSlowDownloadJob::FinishPendingRequests();
+    URLRequestSlowDownloadJob::FinishPendingRequests(false);
+
+  if (LowerCaseEqualsASCII(kErrorFinishDownloadUrl,
+                           request_->url().spec().c_str())) {
+    URLRequestSlowDownloadJob::FinishPendingRequests(true);
+  }
 
   NotifyHeadersComplete();
 }
 
 bool URLRequestSlowDownloadJob::ReadRawData(net::IOBuffer* buf, int buf_size,
                                             int *bytes_read) {
-  if (LowerCaseEqualsASCII(kFinishDownloadUrl,
-                           request_->url().spec().c_str())) {
+  if (IsCompletionUrl(request_->url())) {
     *bytes_read = 0;
     return true;
   }
@@ -132,6 +156,9 @@ void URLRequestSlowDownloadJob::CheckDoneStatus() {
     should_send_second_chunk_ = true;
     SetStatus(net::URLRequestStatus());
     NotifyReadComplete(kSecondDownloadSize);
+  } else if (should_error_download_) {
+    NotifyDone(
+        net::URLRequestStatus(net::URLRequestStatus::FAILED, net::ERR_FAILED));
   } else {
     MessageLoop::current()->PostDelayedTask(
         FROM_HERE,
@@ -154,8 +181,7 @@ void URLRequestSlowDownloadJob::GetResponseInfoConst(
     net::HttpResponseInfo* info) const {
   // Send back mock headers.
   std::string raw_headers;
-  if (LowerCaseEqualsASCII(kFinishDownloadUrl,
-                           request_->url().spec().c_str())) {
+  if (IsCompletionUrl(request_->url())) {
     raw_headers.append(
       "HTTP/1.1 200 OK\n"
       "Content-type: text/plain\n");