Move responsiblity of tab suspending from renderer to TabManager

chrome/browser/memory/tab_manager.cc

Index: chrome/browser/memory/tab_manager.cc
diff --git a/chrome/browser/memory/tab_manager.cc b/chrome/browser/memory/tab_manager.cc
index a2299862de6deec44a10eb2a4db511c985a7d215..a5610185afee6fcff6fefe766f2a3758829756a8 100644
--- a/chrome/browser/memory/tab_manager.cc
+++ b/chrome/browser/memory/tab_manager.cc
@@ -480,7 +480,7 @@ 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;
@@ -532,6 +532,20 @@ void TabManager::UpdateTimerCallback() {
   }
   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.