Add non-host functionality to the previews blacklist

components/previews/core/previews_experiments.h

Index: components/previews/core/previews_experiments.h
diff --git a/components/previews/core/previews_experiments.h b/components/previews/core/previews_experiments.h
index 9c8d7add0574d9a8f0a42d6a9bcdd75d41866221..36e4dd7494dc4f74416ca7ffe8c9d3c03d373505 100644
--- a/components/previews/core/previews_experiments.h
+++ b/components/previews/core/previews_experiments.h
@@ -6,31 +6,42 @@
 #define COMPONENTS_PREVIEWS_CORE_PREVIEWS_EXPERIMENTS_H_
 
 #include "base/time/time.h"
 
 namespace previews {
 
 namespace params {
 
 // The maximum number of recent previews navigations the black list looks at to
 // determine if a host is blacklisted.
-size_t MaxStoredHistoryLengthForBlackList();
+size_t MaxStoredHistoryLengthForPerHostBlackList();
+
+// The maximum number of recent previews navigations the black list looks at to
+// determine if all previews navigations are disallowed.
+size_t MaxStoredHistoryLengthForHostIndifferentBlackList();
 
 // The maximum number of hosts allowed in the in memory black list.
 size_t MaxInMemoryHostsInBlackList();
 
 // The number of recent navigations that were opted out of that would trigger
 // the host to be blacklisted.
-int BlackListOptOutThreshold();
+int PerHostBlackListOptOutThreshold();
+
+// The number of recent navigations that were opted out of that would trigger
+// the all previews navigations to be disallowed.
+int HostIndifferentBlackListOptOutThreshold();
 
 // The amount of time a host remains blacklisted due to opt outs.
-base::TimeDelta BlackListDuration();
+base::TimeDelta PerHostBlackListDuration();
+
+// The amount of time all previews navigations are disallowed due to opt outs.
+base::TimeDelta HostIndifferentBlackListPerHostDuration();
 
 }  // namespace params
 
 // Returns true if any client-side previews experiment is active.
 bool IsIncludedInClientSidePreviewsExperimentsFieldTrial();
 
 // Returns true if the field trial that should enable offline pages for
 // prohibitvely slow networks is active.
 bool IsOfflinePreviewsEnabled();