Add PERSISTENT_MAP usage for GpuMemoryBuffers.

content/public/common/content_switches.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 "content/public/common/content_switches.h"
 
 namespace switches {
 
 // The number of MSAA samples for canvas2D. Requires MSAA support by GPU to
 // have an effect. 0 disables MSAA.
@@ skipping 821 matching lines @@
 extern const char kUIPrioritizeInGpuProcess[] =
     "ui-prioritize-in-gpu-process";
 
 // Bypass the media stream infobar by selecting the default device for media
 // streams (e.g. WebRTC). Works with --use-fake-device-for-media-stream.
 const char kUseFakeUIForMediaStream[]     = "use-fake-ui-for-media-stream";
 
 // Enable native GPU memory buffer support when available.
 const char kEnableNativeGpuMemoryBuffers[] = "enable-native-gpu-memory-buffers";
 
-// Overrides the default texture target used with CHROMIUM_image extension.
-const char kUseImageTextureTarget[] = "use-image-texture-target";
+// Overrides the default texture target used with CHROMIUM_image extension for
+// mapable GpuMemoryBuffers.
+const char kMapImageTextureTarget[] = "map-image-texture-target";
+
+// Overrides the default texture target used with CHROMIUM_image extension for
+// persistent-mapable GpuMemoryBuffers.
+const char kPersistentMapImageTextureTarget[] =
+    "persistent-map-image-texture-target";
 
 // Set when Chromium should use a mobile user agent.
 const char kUseMobileUserAgent[] = "use-mobile-user-agent";
 
 // Use normal priority for tile task worker threads.  Otherwise they may
 // be run at background priority on some platforms.
 const char kUseNormalPriorityForTileTaskWorkerThreads[] =
     "use-normal-priority-for-tile-task-worker-threads";
 
 // Use the new surfaces system to handle compositor delegation.
@@ skipping 140 matching lines @@
 // Windows Vista and later.
 const char kTraceExportEventsToETW[] = "trace-export-events-to-etw";
 #endif
 
 // Enables the use of NPAPI plugins.
 const char kEnableNpapi[]                   = "enable-npapi";
 
 // Don't dump stuff here, follow the same order as the header.
 
 }  // namespace switches