Fix tab backgrounding on Linux / ChromeOS

base/process_win.cc

 // Copyright (c) 2011 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 "base/process.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/process_util.h"
 #include "base/win/windows_version.h"
 
@@ skipping 61 matching lines @@
 
 bool Process::is_current() const {
   return process_ == GetCurrentProcess();
 }
 
 // static
 Process Process::Current() {
   return Process(::GetCurrentProcess());
 }
 
+// static
+bool Process::CanBackgroundProcesses() {
+  return true;
+}
+
 int Process::GetPriority() const {
   DCHECK(process_);
   return ::GetPriorityClass(process_);
 }
 
 }  // namespace base