Pass distillability updates from renderer to browser

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 d3d8f4f831e571d7fe6919744a70adaa9c04e4db..2cd5a26b279a96d2ec0f33437e1d2d3e2143e551 100644
--- a/chrome/browser/chrome_content_browser_client.cc
+++ b/chrome/browser/chrome_content_browser_client.cc
@@ -109,6 +109,7 @@
 #include "components/content_settings/core/browser/host_content_settings_map.h"
 #include "components/content_settings/core/common/content_settings.h"
 #include "components/data_reduction_proxy/content/browser/data_reduction_proxy_message_filter.h"
+#include "components/dom_distiller/core/dom_distiller_switches.h"
 #include "components/dom_distiller/core/url_constants.h"
 #include "components/google/core/browser/google_util.h"
 #include "components/metrics/client_info.h"
@@ -1582,6 +1583,7 @@ void ChromeContentBrowserClient::AppendExtraCommandLineSwitches(
       switches::kProfilingAtStart,
       switches::kProfilingFile,
       switches::kProfilingFlush,
+      switches::kReaderModeHeuristics,
       switches::kUnsafelyTreatInsecureOriginAsSecure,
       translate::switches::kTranslateSecurityOrigin,
     };