publish canvas context API stat metrics

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

Index: third_party/WebKit/Source/platform/graphics/CanvasMetrics.cpp
diff --git a/third_party/WebKit/Source/platform/graphics/CanvasMetrics.cpp b/third_party/WebKit/Source/platform/graphics/CanvasMetrics.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..29ff842b52a277c4b879ecc7849a5711bbe78c8b
--- /dev/null
+++ b/third_party/WebKit/Source/platform/graphics/CanvasMetrics.cpp
@@ -0,0 +1,17 @@
+// 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.
+
+#include "config.h"
+#include "platform/graphics/CanvasMetrics.h"
+
+#include "public/platform/Platform.h"
+
+namespace blink {
+
+void CanvasMetrics::countCanvasContextUsage(const CanvasContextUsage canvasContextUsage)
+{
+    Platform::current()->histogramEnumeration("WebCore.CanvasContextUsage", canvasContextUsage, CanvasContextUsage::NumberOfUsages);
+}
+
+} // namespace blink