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 154 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_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::SetDiscardableState(bool state) {
+  if (tab_data_.is_discardable == state)
+    return;
+
+  tab_data_.is_discardable = state;
+
+  // TabManager could not exist in tests.

[Georges Khalil, 2016/07/21 20:51:51]

I don't think that's true anymore. We don't need that check.

[Anderson Silva, 2016/07/21 21:14:49]

Done.

+  if (g_browser_process->GetTabManager()) {
+    g_browser_process->GetTabManager()->OnDiscardableStateChange(web_contents(),
+                                                                 state);
+  }
+}
+
+bool TabManager::WebContentsData::IsDiscardable() {
+  return tab_data_.is_discardable;
+}
+
 }  // namespace memory