Add MemoryCoordinatorDelegate

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 400 matching lines @@
 
 bool TabManager::IsTabAutoDiscardable(content::WebContents* contents) const {
   return GetWebContentsData(contents)->IsAutoDiscardable();
 }
 
 void TabManager::SetTabAutoDiscardableState(content::WebContents* contents,
                                             bool state) {
   GetWebContentsData(contents)->SetAutoDiscardableState(state);
 }
 
+bool TabManager::CanSuspendBackgroundedRenderer(int render_process_id) {
+  // A renderer can be suspended if it's not playing media.
+  auto tab_stats = GetUnsortedTabStats();
+  for (auto& tab : tab_stats) {
+    if (tab.child_process_host_id != render_process_id)
+      continue;
+    TabStripModel* model;
+    int index = FindTabStripModelById(tab.tab_contents_id, &model);
+    if (index == -1)
+      return false;
+    WebContents* web_contents = model->GetWebContentsAt(index);
+    if (IsMediaTab(web_contents))
+      return false;
+  }
+  return true;
+}
+
 // static
 bool TabManager::CompareTabStats(const TabStats& first,
                                  const TabStats& second) {
   // Being currently selected is most important to protect.
   if (first.is_selected != second.is_selected)
     return first.is_selected;
 
   // Non auto-discardable tabs are more important to protect.
   if (first.is_auto_discardable != second.is_auto_discardable)
     return !first.is_auto_discardable;
@@ skipping 509 matching lines @@
   // platform.
   std::string allow_multiple_discards = variations::GetVariationParamValue(
       features::kAutomaticTabDiscarding.name, "AllowMultipleDiscards");
   return (allow_multiple_discards != "true");
 #else
   return false;
 #endif
 }
 
 }  // namespace memory