Destroy GLX windows when they are backgrounded

content/common/gpu/gpu_memory_manager.h

 // 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.
 
 #ifndef CONTENT_COMMON_GPU_GPU_MEMORY_MANAGER_H_
 #define CONTENT_COMMON_GPU_GPU_MEMORY_MANAGER_H_
 
 #include <list>
 #include <map>
 
@@ skipping 10 matching lines @@
 namespace content {
 
 class GpuChannelManager;
 class GpuMemoryManagerClient;
 class GpuMemoryManagerClientState;
 class GpuMemoryTrackingGroup;
 
 class CONTENT_EXPORT GpuMemoryManager :
     public base::SupportsWeakPtr<GpuMemoryManager> {
  public:
-#if defined(OS_ANDROID)
+#if defined(OS_ANDROID) || (defined(OS_LINUX) && !defined(OS_CHROMEOS))
   enum { kDefaultMaxSurfacesWithFrontbufferSoftLimit = 1 };
 #else
   enum { kDefaultMaxSurfacesWithFrontbufferSoftLimit = 8 };
 #endif
   enum ScheduleManageTime {
     // Add a call to Manage to the thread's message loop immediately.
     kScheduleManageNow,
     // Add a Manage call to the thread's message loop for execution 1/60th of
     // of a second from now.
     kScheduleManageLater,
@@ skipping 214 matching lines @@
 
   // Used to disable automatic changes to Manage() in testing.
   bool disable_schedule_manage_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuMemoryManager);
 };
 
 }  // namespace content
 
 #endif // CONTENT_COMMON_GPU_GPU_MEMORY_MANAGER_H_