Fix crash in Canvas2DLayerBridge flushing + reliability metrics

third_party/WebKit/Source/platform/graphics/CanvasMetrics.h

 // Copyright 2015 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 CanvasMetrics_h
 #define CanvasMetrics_h
 
 #include "platform/PlatformExport.h"
 #include "wtf/Allocator.h"
 
 namespace blink {
 
 class PLATFORM_EXPORT CanvasMetrics {
     STATIC_ONLY(CanvasMetrics);
 public:
     enum CanvasContextUsage {
         CanvasCreated = 0,
         GPUAccelerated2DCanvasImageBufferCreated = 1,
         DisplayList2DCanvasImageBufferCreated = 2,
         Unaccelerated2DCanvasImageBufferCreated = 3,
         Accelerated2DCanvasGPUContextLost = 4,
         Unaccelerated2DCanvasImageBufferCreationFailed = 5,
         GPUAccelerated2DCanvasImageBufferCreationFailed = 6,
         DisplayList2DCanvasFallbackToRaster = 7,
+        GPUAccelerated2DCanvasDeferralDisabled = 8,
+        GPUAccelerated2DCanvasSurfaceCreationFailed = 9,
         NumberOfUsages
     };
 
     static void countCanvasContextUsage(const CanvasContextUsage);
 };
 
 } // namespace blink
 
 #endif // CanvasMetrics_h