Adds a new class HttpCache::Writers for multiple cache transactions reading from the network.

net/url_request/url_request_job_unittest.cc

Index: net/url_request/url_request_job_unittest.cc
diff --git a/net/url_request/url_request_job_unittest.cc b/net/url_request/url_request_job_unittest.cc
index 4546552eeca5ac59ded4d9281949776d23da12b7..6057b4962f9557f016d87676d4c806364efec191 100644
--- a/net/url_request/url_request_job_unittest.cc
+++ b/net/url_request/url_request_job_unittest.cc
@@ -93,44 +93,91 @@ void MakeMockReferrerPolicyTransaction(const char* original_url,
   }
   transaction->cert_status = 0;
   transaction->ssl_connection_status = 0;
-  transaction->return_code = OK;
+  transaction->start_return_code = OK;
 }
 
 const MockTransaction kNoFilter_Transaction = {
-    "http://www.google.com/gzyp", "GET", base::Time(), "", LOAD_NORMAL,
+    "http://www.google.com/gzyp",
+    "GET",
+    base::Time(),
+    "",
+    LOAD_NORMAL,
     "HTTP/1.1 200 OK",
     "Cache-Control: max-age=10000\n"
     "Content-Length: 30\n",  // Intentionally wrong.
     base::Time(),
-    "hello", TEST_MODE_NORMAL, nullptr, nullptr, 0, 0, OK,
+    "hello",
+    TEST_MODE_NORMAL,
+    nullptr,
+    nullptr,
+    0,
+    0,
+    OK,
+    OK,
 };
 
 const MockTransaction kGZip_Transaction = {
-    "http://www.google.com/gzyp", "GET", base::Time(), "", LOAD_NORMAL,
+    "http://www.google.com/gzyp",
+    "GET",
+    base::Time(),
+    "",
+    LOAD_NORMAL,
     "HTTP/1.1 200 OK",
     "Cache-Control: max-age=10000\n"
     "Content-Encoding: gzip\n"
     "Content-Length: 30\n",  // Intentionally wrong.
     base::Time(),
-    "", TEST_MODE_NORMAL, &GZipServer, nullptr, nullptr, 0, 0, OK,
+    "",
+    TEST_MODE_NORMAL,
+    &GZipServer,
+    nullptr,
+    nullptr,
+    0,
+    0,
+    OK,
+    OK,
 };
 
 const MockTransaction kGzip_Slow_Transaction = {
-    "http://www.google.com/gzyp", "GET", base::Time(), "", LOAD_NORMAL,
+    "http://www.google.com/gzyp",
+    "GET",
+    base::Time(),
+    "",
+    LOAD_NORMAL,
     "HTTP/1.1 200 OK",
     "Cache-Control: max-age=10000\n"
     "Content-Encoding: gzip\n",
-    base::Time(), "", TEST_MODE_SLOW_READ, &GZipHelloServer, nullptr, nullptr,
-    0, 0, OK,
+    base::Time(),
+    "",
+    TEST_MODE_SLOW_READ,
+    &GZipHelloServer,
+    nullptr,
+    nullptr,
+    0,
+    0,
+    OK,
+    OK,
 };
 
 const MockTransaction kRedirect_Transaction = {
-    "http://www.google.com/redirect", "GET", base::Time(), "", LOAD_NORMAL,
+    "http://www.google.com/redirect",
+    "GET",
+    base::Time(),
+    "",
+    LOAD_NORMAL,
     "HTTP/1.1 302 Found",
     "Cache-Control: max-age=10000\n"
     "Location: http://www.google.com/destination\n"
     "Content-Length: 5\n",
-    base::Time(), "hello", TEST_MODE_NORMAL, nullptr, nullptr, nullptr, 0, 0,
+    base::Time(),
+    "hello",
+    TEST_MODE_NORMAL,
+    nullptr,
+    nullptr,
+    nullptr,
+    0,
+    0,
+    OK,
     OK,
 };
 
@@ -151,24 +198,49 @@ const MockTransaction kEmptyBodyGzip_Transaction = {
     0,
     0,
     OK,
+    OK,
 };
 
 const MockTransaction kInvalidContentGZip_Transaction = {
-    "http://www.google.com/gzyp", "GET", base::Time(), "", LOAD_NORMAL,
+    "http://www.google.com/gzyp",
+    "GET",
+    base::Time(),
+    "",
+    LOAD_NORMAL,
     "HTTP/1.1 200 OK",
     "Content-Encoding: gzip\n"
     "Content-Length: 21\n",
-    base::Time(), "not a valid gzip body", TEST_MODE_NORMAL, nullptr, nullptr,
-    nullptr, 0, 0, OK,
+    base::Time(),
+    "not a valid gzip body",
+    TEST_MODE_NORMAL,
+    nullptr,
+    nullptr,
+    nullptr,
+    0,
+    0,
+    OK,
+    OK,
 };
 
 const MockTransaction kBrotli_Slow_Transaction = {
-    "http://www.google.com/brotli", "GET", base::Time(), "", LOAD_NORMAL,
+    "http://www.google.com/brotli",
+    "GET",
+    base::Time(),
+    "",
+    LOAD_NORMAL,
     "HTTP/1.1 200 OK",
     "Cache-Control: max-age=10000\n"
     "Content-Encoding: br\n",
-    base::Time(), "", TEST_MODE_SLOW_READ, &BrotliHelloServer, nullptr, nullptr,
-    0, 0, OK,
+    base::Time(),
+    "",
+    TEST_MODE_SLOW_READ,
+    &BrotliHelloServer,
+    nullptr,
+    nullptr,
+    0,
+    0,
+    OK,
+    OK,
 };
 
 }  // namespace