Remove Enumeration Histograms from the Blink Platform API.

third_party/WebKit/Source/core/html/HTMLCanvasElement.cpp

 /*
  * Copyright (C) 2004, 2006, 2007 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alp Toker <alp@atoker.com>
  * Copyright (C) 2010 Torch Mobile (Beijing) Co. Ltd. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 28 matching lines @@
 #include "core/frame/Settings.h"
 #include "core/html/ImageData.h"
 #include "core/html/canvas/CanvasAsyncBlobCreator.h"
 #include "core/html/canvas/CanvasContextCreationAttributes.h"
 #include "core/html/canvas/CanvasFontCache.h"
 #include "core/html/canvas/CanvasRenderingContext.h"
 #include "core/html/canvas/CanvasRenderingContextFactory.h"
 #include "core/imagebitmap/ImageBitmapOptions.h"
 #include "core/layout/LayoutHTMLCanvas.h"
 #include "core/paint/PaintLayer.h"
+#include "platform/Histogram.h"
 #include "platform/MIMETypeRegistry.h"
 #include "platform/RuntimeEnabledFeatures.h"
 #include "platform/graphics/Canvas2DImageBufferSurface.h"
 #include "platform/graphics/CanvasMetrics.h"
 #include "platform/graphics/ExpensiveCanvasHeuristicParameters.h"
 #include "platform/graphics/ImageBuffer.h"
 #include "platform/graphics/RecordingImageBufferSurface.h"
 #include "platform/graphics/StaticBitmapImage.h"
 #include "platform/graphics/UnacceleratedImageBufferSurface.h"
 #include "platform/graphics/gpu/AcceleratedImageBufferSurface.h"
@@ skipping 171 matching lines @@
 
 CanvasRenderingContext* HTMLCanvasElement::getCanvasRenderingContext(const String& type, const CanvasContextCreationAttributes& attributes)
 {
     CanvasRenderingContext::ContextType contextType = CanvasRenderingContext::contextTypeFromId(type);
 
     // Unknown type.
     if (contextType == CanvasRenderingContext::ContextTypeCount)
         return nullptr;
 
     // Log the aliased context type used.
-    if (!m_context)
-        Platform::current()->histogramEnumeration("Canvas.ContextType", contextType, CanvasRenderingContext::ContextTypeCount);
+    if (!m_context) {
+        DEFINE_STATIC_LOCAL(EnumerationHistogram, contextTypeHistogram, ("Canvas.ContextType", CanvasRenderingContext::ContextTypeCount));
+        contextTypeHistogram.count(contextType);
+    }
 
     contextType = CanvasRenderingContext::resolveContextTypeAliases(contextType);
 
     CanvasRenderingContextFactory* factory = getRenderingContextFactory(contextType);
     if (!factory)
         return nullptr;
 
     // FIXME - The code depends on the context not going away once created, to prevent JS from
     // seeing a dangling pointer. So for now we will disallow the context from being changed
     // once it is created.
@@ skipping 769 matching lines @@
     }
     return ImageBitmapSource::fulfillImageBitmap(scriptState, isPaintable() ? ImageBitmap::create(this, IntRect(sx, sy, sw, sh), options) : nullptr);
 }
 
 bool HTMLCanvasElement::isOpaque() const
 {
     return m_context && !m_context->hasAlpha();
 }
 
 } // namespace blink