publish canvas context API stat 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"
+
+namespace blink {
+
+class PLATFORM_EXPORT CanvasMetrics {
+public:
+    enum CanvasContextUsage {
+        CanvasCreated = 0,
+        GPUAccelerated2DCanvasImageBufferCreated = 1,
+        DisplayList2DCanvasImageBufferCreated = 2,
+        Unaccelerated2DCanvasImageBufferCreated = 3,
+        Accelerated2DCanvasGPUContextLost = 4,
+        Unaccelerated2DCanvasImageBufferCreationFailed = 5,
+        GPUAccelerated2DCanvasImageBufferCreationFailed = 6,
+        DisplayList2DCanvasFallbackToRaster = 7,
+        NumberOfUsages
+    };
+
+    static void countCanvasContextUsage(const CanvasContextUsage);
+};
+
+} // namespace blink
+
+#endif // CanvasMetrics_h