Discardable property support on TabManager

chrome/browser/memory/tab_manager_web_contents_data.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/memory/tab_manager_web_contents_data.h"
 
 #include "base/metrics/histogram.h"
 #include "base/time/tick_clock.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/engagement/site_engagement_service.h"
@@ skipping 80 matching lines @@
         tab_data_.engagement_score_ =
             service->GetScore(web_contents()->GetLastCommittedURL());
         UMA_HISTOGRAM_COUNTS_100(
             "TabManager.Discarding.DiscardedEngagementScore",
             tab_data_.engagement_score_);
       }
     }
   }
 
   tab_data_.is_discarded_ = state;
-
-  // TabManager could not exist in tests.
-  if (g_browser_process->GetTabManager()) {
-    g_browser_process->GetTabManager()->OnDiscardedStateChange(web_contents(),
-                                                               state);
-  }
+  g_browser_process->GetTabManager()->OnDiscardedStateChange(web_contents(),
+                                                             state);
 }
 
 int TabManager::WebContentsData::DiscardCount() {
   return tab_data_.discard_count_;
 }
 
 void TabManager::WebContentsData::IncrementDiscardCount() {
   tab_data_.discard_count_++;
 }
 
@@ skipping 48 matching lines @@
 }
 
 TabManager::WebContentsData::Data::Data()
     : is_discarded_(false),
       discard_count_(0),
       is_recently_audible_(false),
       last_audio_change_time_(TimeTicks::UnixEpoch()),
       last_discard_time_(TimeTicks::UnixEpoch()),
       last_reload_time_(TimeTicks::UnixEpoch()),
       last_inactive_time_(TimeTicks::UnixEpoch()),
-      engagement_score_(-1.0) {}
+      engagement_score_(-1.0),
+      is_auto_discardable(true) {}
 
 bool TabManager::WebContentsData::Data::operator==(const Data& right) const {
   return is_discarded_ == right.is_discarded_ &&
          is_recently_audible_ == right.is_recently_audible_ &&
          last_audio_change_time_ == right.last_audio_change_time_ &&
          last_discard_time_ == right.last_discard_time_ &&
          last_reload_time_ == right.last_reload_time_ &&
          last_inactive_time_ == right.last_inactive_time_ &&
          engagement_score_ == right.engagement_score_;
 }
 
 bool TabManager::WebContentsData::Data::operator!=(const Data& right) const {
   return !(*this == right);
 }
 
+void TabManager::WebContentsData::SetAutoDiscardableState(bool state) {
+  if (tab_data_.is_auto_discardable == state)
+    return;
+
+  tab_data_.is_auto_discardable = state;
+  g_browser_process->GetTabManager()->OnAutoDiscardableStateChange(
+      web_contents(), state);
+}
+
+bool TabManager::WebContentsData::IsAutoDiscardable() {
+  return tab_data_.is_auto_discardable;
+}
+
 }  // namespace memory