Fix headless_browsertests failures with PlzNavigate.

content/browser/devtools/protocol/network_handler.cc

Index: content/browser/devtools/protocol/network_handler.cc
diff --git a/content/browser/devtools/protocol/network_handler.cc b/content/browser/devtools/protocol/network_handler.cc
index 013609738d34bb0c010df75e2bc86050e3b409d1..4e3f2746c56f08364e7a7b8f03a2a7bfb6654140 100644
--- a/content/browser/devtools/protocol/network_handler.cc
+++ b/content/browser/devtools/protocol/network_handler.cc
@@ -9,6 +9,7 @@
 #include "base/barrier_closure.h"
 #include "base/command_line.h"
 #include "base/containers/hash_tables.h"
+#include "base/process/process_handle.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/stringprintf.h"
 #include "base/time/time.h"
@@ -17,6 +18,7 @@
 #include "content/browser/devtools/protocol/security.h"
 #include "content/browser/frame_host/frame_tree_node.h"
 #include "content/browser/frame_host/render_frame_host_impl.h"
+#include "content/common/navigation_params.h"
 #include "content/common/resource_request.h"
 #include "content/common/resource_request_completion_status.h"
 #include "content/public/browser/browser_context.h"
@@ -31,6 +33,7 @@
 #include "content/public/common/content_switches.h"
 #include "content/public/common/resource_devtools_info.h"
 #include "content/public/common/resource_response.h"
+#include "net/base/net_errors.h"
 #include "net/cookies/cookie_store.h"
 #include "net/http/http_response_headers.h"
 #include "net/url_request/url_request_context.h"
@@ -671,6 +674,53 @@ void NetworkHandler::NavigationPreloadCompleted(
       completion_status.encoded_data_length);
 }
 
+void NetworkHandler::NavigationFailed(
+    const CommonNavigationParams& common_params,
+    const BeginNavigationParams& begin_params,
+    net::Error error_code) {
+  if (!enabled_)
+    return;
+
+  static int next_id = 0;
+  std::string request_id = base::IntToString(base::GetCurrentProcId()) + "." +
+                           base::IntToString(++next_id);
+  std::string error_string = net::ErrorToString(error_code);
+  bool cancelled = error_code == net::Error::ERR_ABORTED;
+
+  std::unique_ptr<DictionaryValue> headers_dict(DictionaryValue::create());
+  net::HttpRequestHeaders headers;
+  headers.AddHeadersFromString(begin_params.headers);
+  for (net::HttpRequestHeaders::Iterator it(headers); it.GetNext();)
+    headers_dict->setString(it.name(), it.value());
+  frontend_->RequestWillBeSent(
+      request_id, request_id /* frameId */, request_id /* loaderId */,
+      common_params.url.spec(),
+      Network::Request::Create()
+          .SetUrl(common_params.url.spec())
+          .SetMethod(common_params.method)
+          .SetHeaders(Object::fromValue(headers_dict.get(), nullptr))
+          // Note: the priority value is copied from
+          // ResourceDispatcherHostImpl::BeginNavigationRequest but there isn't
+          // a good way of sharing this.
+          .SetInitialPriority(resourcePriority(net::HIGHEST))
+          .SetReferrerPolicy(referrerPolicy(common_params.referrer.policy))
+          .Build(),
+      base::TimeTicks::Now().ToInternalValue() /
+          static_cast<double>(base::Time::kMicrosecondsPerSecond),
+      base::Time::Now().ToDoubleT(),
+      Network::Initiator::Create()
+          .SetType(Network::Initiator::TypeEnum::Parser)
+          .Build(),
+      std::unique_ptr<Network::Response>(),
+      std::string(Page::ResourceTypeEnum::Document));
+
+  frontend_->LoadingFailed(
+      request_id,
+      base::TimeTicks::Now().ToInternalValue() /
+          static_cast<double>(base::Time::kMicrosecondsPerSecond),
+      Page::ResourceTypeEnum::Document, error_string, cancelled);
+}
+
 std::string NetworkHandler::UserAgentOverride() const {
   return enabled_ ? user_agent_ : std::string();
 }