Add an heuristic for promoting canvases to GPU acceleration

third_party/WebKit/Source/modules/canvas2d/BaseRenderingContext2D.cpp

 // Copyright 2016 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 "modules/canvas2d/BaseRenderingContext2D.h"
 
 #include "bindings/core/v8/ExceptionMessages.h"
 #include "bindings/core/v8/ExceptionState.h"
 #include "core/css/cssom/CSSURLImageValue.h"
 #include "core/css/parser/CSSParser.h"
@@ skipping 1156 matching lines @@
     return;
 
   DisableDeferralReason reason = DisableDeferralReasonUnknown;
   if (shouldDisableDeferral(imageSource, &reason))
     disableDeferral(reason);
   else if (image->isTextureBacked())
     disableDeferral(DisableDeferralDrawImageWithTextureBackedSourceImage);
 
   validateStateStack();
 
+  willDrawImage(imageSource);
+
+  validateStateStack();
+
   // Heuristic for disabling acceleration based on anticipated texture upload
   // overhead.
   // See comments in ExpensiveCanvasHeuristicParameters.h for explanation.
   ImageBuffer* buffer = imageBuffer();
   if (buffer && buffer->isAccelerated() && !imageSource->isAccelerated()) {
     float srcArea = srcRect.width() * srcRect.height();
     if (srcArea > ExpensiveCanvasHeuristicParameters::
                       DrawImageTextureUploadHardSizeLimit) {
       buffer->disableAcceleration();
     } else if (srcArea > ExpensiveCanvasHeuristicParameters::
@@ skipping 826 matching lines @@
       ExpensiveCanvasHeuristicParameters::ShadowFixedCost[index] *
           m_usageCounters.numBlurredShadows +
       ExpensiveCanvasHeuristicParameters::
               ShadowVariableCostPerAreaTimesShadowBlurSquared[index] *
           m_usageCounters.boundingBoxAreaTimesShadowBlurSquared;
 
   return basicCostOfDrawCalls + fillTypeAdjustment + shadowAdjustment;
 }
 
 }  // namespace blink