Introduce Origin-Trial for Service Worker Navigation Preload

content/browser/service_worker/service_worker_version.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/service_worker/service_worker_version.h"
 
 #include <stddef.h>
 
 #include <limits>
 #include <map>
 #include <string>
 
 #include "base/command_line.h"
 #include "base/debug/alias.h"
+#include "base/feature_list.h"
 #include "base/guid.h"
 #include "base/location.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/single_thread_task_runner.h"
 #include "base/stl_util.h"
 #include "base/strings/string16.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/threading/thread_task_runner_handle.h"
@@ skipping 14 matching lines @@
 #include "content/common/origin_trials/trial_token_validator.h"
 #include "content/common/service_worker/embedded_worker_messages.h"
 #include "content/common/service_worker/embedded_worker_start_params.h"
 #include "content/common/service_worker/service_worker_messages.h"
 #include "content/common/service_worker/service_worker_type_converters.h"
 #include "content/common/service_worker/service_worker_utils.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/content_browser_client.h"
 #include "content/public/browser/render_process_host.h"
 #include "content/public/common/content_client.h"
+#include "content/public/common/content_features.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/common/result_codes.h"
 #include "net/http/http_response_headers.h"
 #include "net/http/http_response_info.h"
 
 namespace content {
 
 using StatusCallback = ServiceWorkerVersion::StatusCallback;
 
 namespace {
@@ skipping 1065 matching lines @@
 
 void ServiceWorkerVersion::NotifyMainScriptRequestHandlerCreated() {
   main_script_request_handler_created_ = true;
 }
 
 void ServiceWorkerVersion::NotifyMainScriptJobCreated(
     ServiceWorkerContextRequestHandler::CreateJobStatus status) {
   main_script_job_created_ = status;
 }
 
+ServiceWorkerVersion::NavigationPreloadSupportStatus
+ServiceWorkerVersion::GetNavigationPreloadSupportStatus() const {
+  // The origin trial of Navigation Preload started from M57. And the worker
+  // entry in the database written by Chrome (>= M56) must have the
+  // origin_trial_tokens field.
+  const bool has_valid_token =
+      origin_trial_tokens_ &&
+      base::ContainsKey(*origin_trial_tokens_,
+                        "ServiceWorkerNavigationPreload");
+  if (!has_valid_token) {
+    if (base::FeatureList::GetInstance()->IsFeatureOverriddenFromCommandLine(
+            features::kServiceWorkerNavigationPreload.name,
+            base::FeatureList::OVERRIDE_ENABLE_FEATURE)) {
+      return NavigationPreloadSupportStatus::SUPPORTED;
+    } else {
+      return NavigationPreloadSupportStatus::
+          NOT_SUPPORTED_NO_VALID_ORIGIN_TRIAL_TOKEN;
+    }
+  }
+  if (base::FeatureList::GetInstance()->IsFeatureOverriddenFromCommandLine(
+          features::kServiceWorkerNavigationPreload.name,
+          base::FeatureList::OVERRIDE_ENABLE_FEATURE)) {
+    return NavigationPreloadSupportStatus::SUPPORTED;
+  }
+  if (base::FeatureList::GetInstance()->IsFeatureOverriddenFromCommandLine(
+          features::kServiceWorkerNavigationPreload.name,
+          base::FeatureList::OVERRIDE_DISABLE_FEATURE)) {
+    return NavigationPreloadSupportStatus::
+        NOT_SUPPORTED_DISABLED_BY_COMMAND_LINE;
+  }
+  if (base::FeatureList::IsEnabled(features::kServiceWorkerNavigationPreload)) {
+    return NavigationPreloadSupportStatus::SUPPORTED;
+  }
+  return NavigationPreloadSupportStatus::NOT_SUPPORTED_FIELD_TRIAL_STOPPED;
+}
+
 void ServiceWorkerVersion::OnSimpleEventResponse(
     int request_id,
     blink::WebServiceWorkerEventResult result,
     base::Time dispatch_event_time) {
   ServiceWorkerStatusCode status = SERVICE_WORKER_OK;
   if (result == blink::WebServiceWorkerEventResultRejected)
     status = SERVICE_WORKER_ERROR_EVENT_WAITUNTIL_REJECTED;
   OnSimpleEventFinished(request_id, status, dispatch_event_time);
 }
 
@@ skipping 781 matching lines @@
 
 void ServiceWorkerVersion::CleanUpExternalRequest(
     const std::string& request_uuid,
     ServiceWorkerStatusCode status) {
   if (status == SERVICE_WORKER_OK)
     return;
   external_request_uuid_to_request_id_.erase(request_uuid);
 }
 
 }  // namespace content