Fixed existing launch cause for video decode accelerator initialization,

content/common/gpu/gpu_process_launch_causes.h

 // 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.
 
 #ifndef CONTENT_COMMON_GPU_GPU_PROCESS_LAUNCH_CAUSES_H_
 #define CONTENT_COMMON_GPU_GPU_PROCESS_LAUNCH_CAUSES_H_
 #pragma once
 
 namespace content {
 
 // If you change this enum you also need to update
 // tools/histograms/histograms.xml.
 enum CauseForGpuLaunch {
   CAUSE_FOR_GPU_LAUNCH_ABOUT_GPUCRASH,
   CAUSE_FOR_GPU_LAUNCH_ABOUT_GPUHANG,
   CAUSE_FOR_GPU_LAUNCH_GPUDATAMANAGER_REQUESTCOMPLETEGPUINFOIFNEEDED,
   CAUSE_FOR_GPU_LAUNCH_RENDERWIDGETFULLSCREENPEPPER_CREATECONTEXT,
   CAUSE_FOR_GPU_LAUNCH_WEBGRAPHICSCONTEXT3DCOMMANDBUFFERIMPL_INITIALIZE,
+  CAUSE_FOR_GPU_LAUNCH_NO_LAUNCH,
   CAUSE_FOR_GPU_LAUNCH_VIDEODECODEACCELERATOR_INITIALIZE,
   CAUSE_FOR_GPU_LAUNCH_PEPPERPLATFORMCONTEXT3DIMPL_INITIALIZE,
-  CAUSE_FOR_GPU_LAUNCH_NO_LAUNCH,
+
+  // All new values should be inserted above this point so that
+  // existing values continue to match up with those in histograms.xml.
   CAUSE_FOR_GPU_LAUNCH_MAX_ENUM
 };
 
 }  // namespace content
 
 
 #endif  // CONTENT_COMMON_GPU_GPU_PROCESS_LAUNCH_CAUSES_H_