Move responsiblity of tab suspending from renderer to TabManager

chrome/browser/memory/tab_manager.cc

 // Copyright (c) 2012 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.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <set>
@@ skipping 462 matching lines @@
                 stats_list);
     // The active browser window is processed in the first iteration.
     browser_active = false;
   }
 }
 
 void TabManager::AddTabStats(const TabStripModel* model,
                              bool is_app,
                              bool active_model,
                              TabStatsList* stats_list) {
-for (int i = 0; i < model->count(); i++) {
+  for (int i = 0; i < model->count(); i++) {
     WebContents* contents = model->GetWebContentsAt(i);
     if (!contents->IsCrashed()) {
       TabStats stats;
       stats.is_app = is_app;
       stats.is_internal_page =
           IsInternalPage(contents->GetLastCommittedURL());
       stats.is_media = IsMediaTab(contents);
       stats.is_pinned = model->IsTabPinned(i);
       stats.is_selected = active_model && model->IsTabSelected(i);
       stats.is_discarded = GetWebContentsData(contents)->IsDiscarded();
@@ skipping 31 matching lines @@
     if (suspend_time.InSeconds() > kSuspendThresholdSeconds) {
       // System was probably suspended, move the event timers forward in time so
       // when they get subtracted out later, "uptime" is being counted.
       start_time_ += suspend_time;
       if (!last_discard_time_.is_null())
         last_discard_time_ += suspend_time;
     }
   }
   last_adjust_time_ = NowTicks();
 
+#if defined(OS_ANDROID)

[Georges Khalil, 2016/04/19 13:55:19]

Move this to an android delegate, similar to chromeos.

+  auto tab_stats = GetUnsortedTabStats();
+  for (auto& tab : tab_stats) {
+    if (!tab.render_process_host->IsProcessBackgrounded())
+      continue;
+    if (NowTicks() - tab.last_active <
+        base::TimeDelta::FromSeconds(
+            kSuspendTimersWhenBackgroundedDelayInSeconds)) {
+      continue;
+    }
+    tab.render_process_host->Suspend();
+  }
+#endif
+
 #if defined(OS_CHROMEOS)
   TabStatsList stats_list = GetTabStats();
   // This starts the CrOS specific OOM adjustments in /proc/<pid>/oom_score_adj.
   delegate_->AdjustOomPriorities(stats_list);
 #endif
 }
 
 bool TabManager::CanDiscardTab(int64_t target_web_contents_id) const {
   TabStripModel* model;
   int idx = FindTabStripModelById(target_web_contents_id, &model);
@@ skipping 295 matching lines @@
     }
   } else {
     // The code here can only be tested under a full browser test.
     AddTabStats(&stats_list);
   }
 
   return stats_list;
 }
 
 }  // namespace memory