[TooManyTabs] Add TabNavigationThrottle

chrome/browser/chrome_content_browser_client.cc

Index: chrome/browser/chrome_content_browser_client.cc
diff --git a/chrome/browser/chrome_content_browser_client.cc b/chrome/browser/chrome_content_browser_client.cc
index 9d061cb3fd76543097c1850d84746350aaa5fb9c..1bcd57e9b875218dfa8d9a286ea080c985ea9ebd 100644
--- a/chrome/browser/chrome_content_browser_client.cc
+++ b/chrome/browser/chrome_content_browser_client.cc
@@ -73,6 +73,7 @@
 #include "chrome/browser/renderer_host/chrome_navigation_ui_data.h"
 #include "chrome/browser/renderer_host/chrome_render_message_filter.h"
 #include "chrome/browser/renderer_host/pepper/chrome_browser_pepper_host_factory.h"
+#include "chrome/browser/resource_coordinator/background_tab_navigation_throttle.h"
 #include "chrome/browser/safe_browsing/browser_url_loader_throttle.h"
 #include "chrome/browser/safe_browsing/certificate_reporting_service.h"
 #include "chrome/browser/safe_browsing/certificate_reporting_service_factory.h"
@@ -3243,6 +3244,14 @@ ChromeContentBrowserClient::CreateThrottlesForNavigation(
                                                               &throttles);
   }
 
+#if !defined(OS_ANDROID)

[Charlie Reis, 2017/07/07 22:07:56]

Please include a comment for why this isn't enabled on Android.

[Zhen Wang, 2017/07/10 17:21:54]

Done.

+  std::unique_ptr<content::NavigationThrottle>
+      background_tab_navigation_throttle = resource_coordinator::
+          BackgroundTabNavigationThrottle::MaybeCreateThrottleFor(handle);
+  if (background_tab_navigation_throttle)
+    throttles.push_back(std::move(background_tab_navigation_throttle));
+#endif
+
   return throttles;
 }