Add the client for accessing Subresource Filter only list.

components/subresource_filter/content/browser/content_subresource_filter_driver_factory.cc

Index: components/subresource_filter/content/browser/content_subresource_filter_driver_factory.cc
diff --git a/components/subresource_filter/content/browser/content_subresource_filter_driver_factory.cc b/components/subresource_filter/content/browser/content_subresource_filter_driver_factory.cc
index 593095a8d802e33a09accbee6e41b5c222206dd3..0f40f1586b863ccff2e45f206babe60ed864862d 100644
--- a/components/subresource_filter/content/browser/content_subresource_filter_driver_factory.cc
+++ b/components/subresource_filter/content/browser/content_subresource_filter_driver_factory.cc
@@ -354,6 +354,7 @@ int ContentSubresourceFilterDriverFactory::CalculateHitPatternForActivationList(
   const int kInitialURLHitMask = 0x4;
   const int kRedirectURLHitMask = 0x2;
   const int kFinalURLHitMask = 0x1;
+
   if (navigation_chain_.size() > 1) {
     if (DidURLMatchActivationList(navigation_chain_.back(), activation_list))
       hits_pattern |= kFinalURLHitMask;
@@ -381,6 +382,7 @@ void ContentSubresourceFilterDriverFactory::RecordRedirectChainMatchPattern()
   RecordRedirectChainMatchPatternForList(
       ActivationList::SOCIAL_ENG_ADS_INTERSTITIAL);
   RecordRedirectChainMatchPatternForList(ActivationList::PHISHING_INTERSTITIAL);
+  RecordRedirectChainMatchPatternForList(ActivationList::SUBRESOURCE_FILTER);
 }
 
 void ContentSubresourceFilterDriverFactory::
@@ -399,6 +401,10 @@ void ContentSubresourceFilterDriverFactory::
       REPORT_REDIRECT_PATTERN_FOR_SUFFIX("PhishingInterstital", hits_pattern,
                                          chain_size);
       break;
+    case ActivationList::SUBRESOURCE_FILTER:
+      REPORT_REDIRECT_PATTERN_FOR_SUFFIX("SubresourceFilterOnly", hits_pattern,

[vakh (use Gerrit instead), 2017/03/16 20:51:18]

s/Only// ?

[melandory, 2017/03/24 15:49:27]

I like "Only" in suffix, without it full histogram name sounds strange to me

+                                         chain_size);
+      break;
     default:
       NOTREACHED();
       break;