First-Party Cookies: Wire it up as an experimental web platform feature

chrome/browser/net/chrome_network_delegate.cc

Index: chrome/browser/net/chrome_network_delegate.cc
diff --git a/chrome/browser/net/chrome_network_delegate.cc b/chrome/browser/net/chrome_network_delegate.cc
index 39e3626fbfdaa6c5f547c3a03846acb06af9693b..45ded26c648684defe1b77542a4ff949eb1c910b 100644
--- a/chrome/browser/net/chrome_network_delegate.cc
+++ b/chrome/browser/net/chrome_network_delegate.cc
@@ -9,6 +9,7 @@
 #include <vector>
 
 #include "base/base_paths.h"
+#include "base/command_line.h"
 #include "base/debug/alias.h"
 #include "base/debug/dump_without_crashing.h"
 #include "base/debug/stack_trace.h"
@@ -41,6 +42,7 @@
 #include "content/public/browser/render_frame_host.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/resource_request_info.h"
+#include "content/public/common/content_switches.h"
 #include "content/public/common/process_type.h"
 #include "net/base/host_port_pair.h"
 #include "net/base/load_flags.h"
@@ -61,7 +63,6 @@
 #endif
 
 #if defined(OS_CHROMEOS)
-#include "base/command_line.h"
 #include "base/sys_info.h"
 #include "chrome/common/chrome_switches.h"
 #endif
@@ -295,6 +296,7 @@ ChromeNetworkDelegate::ChromeNetworkDelegate(
       url_blacklist_manager_(NULL),
 #endif
       domain_reliability_monitor_(NULL),
+      experimental_web_platform_features_enabled_(false),
       first_request_(true),
       prerender_tracker_(NULL) {
   DCHECK(enable_referrers);
@@ -330,6 +332,10 @@ void ChromeNetworkDelegate::SetEnableClientHints() {
   client_hints_->Init();
 }
 
+void ChromeNetworkDelegate::SetExperimentalWebPlatformFeaturesEnabled() {
+  experimental_web_platform_features_enabled_ = true;
+}
+
 // static
 #if defined(ENABLE_EXTENSIONS)
 void ChromeNetworkDelegate::NeverThrottleRequests() {
@@ -742,6 +748,10 @@ bool ChromeNetworkDelegate::OnCanEnablePrivacyMode(
   return privacy_mode;
 }
 
+bool ChromeNetworkDelegate::OnFirstPartyCookieExperimentEnabled() const {
+  return experimental_web_platform_features_enabled_;
+}
+
 bool ChromeNetworkDelegate::OnCancelURLRequestWithPolicyViolatingReferrerHeader(
     const net::URLRequest& request,
     const GURL& target_url,