Add PERSISTENT_MAP usage for GpuMemoryBuffers.

content/public/common/content_switches.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.
 
 // Defines all the "content" command-line switches.
 
 #ifndef CONTENT_PUBLIC_COMMON_CONTENT_SWITCHES_H_
 #define CONTENT_PUBLIC_COMMON_CONTENT_SWITCHES_H_
 
 #include "build/build_config.h"
@@ skipping 210 matching lines @@
 CONTENT_EXPORT extern const char kTouchTextSelectionStrategy[];
 CONTENT_EXPORT extern const char kTraceShutdown[];
 extern const char kTraceShutdownFile[];
 extern const char kTraceStartup[];
 extern const char kTraceStartupDuration[];
 extern const char kTraceStartupFile[];
 CONTENT_EXPORT extern const char kTraceUploadURL[];
 CONTENT_EXPORT extern const char kUIPrioritizeInGpuProcess[];
 CONTENT_EXPORT extern const char kUseFakeUIForMediaStream[];
 CONTENT_EXPORT extern const char kEnableNativeGpuMemoryBuffers[];
-CONTENT_EXPORT extern const char kUseImageTextureTarget[];
+CONTENT_EXPORT extern const char kMapImageTextureTarget[];
+CONTENT_EXPORT extern const char kPersistentMapImageTextureTarget[];

[reveman, 2015/05/20 14:26:08]

See my content/renderer/gpu/compositor_dependencies.h comment. I don't think a
different command line switch for each combination of format and usage is an
acceptable solution.

[danakj, 2015/05/20 17:51:14]

This is just to support partial update vs not. I agree with you, but the
compositor only uses a single format and we don't know what it is in the
embedder. This is only going as far as we need to go for supporting partial tile
updates. Please don't make me rewrite everything about choosing GpuMemoryBuffer
formats in order to implement partial tile updates. This is blocking implside
painting and I just don't see the need.

 CONTENT_EXPORT extern const char kUseMobileUserAgent[];
 CONTENT_EXPORT extern const char kUseNormalPriorityForTileTaskWorkerThreads[];
 extern const char kUseSurfaces[];
 CONTENT_EXPORT extern const char kDisableSurfaces[];
 extern const char kUtilityCmdPrefix[];
 CONTENT_EXPORT extern const char kUtilityProcess[];
 extern const char kUtilityProcessAllowedDir[];
 CONTENT_EXPORT extern const char kUtilityProcessEnableMDns[];
 CONTENT_EXPORT extern const char kUtilityProcessRunningElevated[];
 CONTENT_EXPORT extern const char kV8CacheOptions[];
@@ skipping 55 matching lines @@
 #endif
 
 CONTENT_EXPORT extern const char kEnableNpapi[];
 
 // DON'T ADD RANDOM STUFF HERE. Put it in the main section above in
 // alphabetical order, or in one of the ifdefs (also in order in each section).
 
 }  // namespace switches
 
 #endif  // CONTENT_PUBLIC_COMMON_CONTENT_SWITCHES_H_