Add display list fallback reason histograms for 2D canvas

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 414 matching lines @@
 
     bool listenerNeedsNewFrameCapture = false;
     for (const CanvasDrawListener* listener : m_listeners) {
         if (listener->needsNewFrame()) {
             listenerNeedsNewFrameCapture = true;
         }
     }
 
     if (listenerNeedsNewFrameCapture) {
         SourceImageStatus status;
-        RefPtr<Image> sourceImage = getSourceImageForCanvas(&status, PreferNoAcceleration);
+        RefPtr<Image> sourceImage = getSourceImageForCanvas(&status, PreferNoAcceleration, SnapshotReasonCanvasListenerCapture);
         if (status != NormalSourceImageStatus)
             return;
         RefPtr<SkImage> image = sourceImage->imageForCurrentFrame();
         for (CanvasDrawListener* listener : m_listeners) {
             if (listener->needsNewFrame()) {
                 listener->sendNewFrame(image);
             }
         }
     }
 
@@ skipping 60 matching lines @@
     return AtomicString(toDataURLInternal(DefaultMimeType, 0, FrontBuffer));
 }
 
 void HTMLCanvasElement::prepareSurfaceForPaintingIfNeeded() const
 {
     ASSERT(m_context && m_context->is2d()); // This function is called by the 2d context
     if (buffer())
         m_imageBuffer->prepareSurfaceForPaintingIfNeeded();
 }
 
-ImageData* HTMLCanvasElement::toImageData(SourceDrawingBuffer sourceBuffer) const
+ImageData* HTMLCanvasElement::toImageData(SourceDrawingBuffer sourceBuffer, SnapshotReason reason) const
 {
     ImageData* imageData;
     if (is3D()) {
         // Get non-premultiplied data because of inaccurate premultiplied alpha conversion of buffer()->toDataURL().
         imageData = m_context->paintRenderingResultsToImageData(sourceBuffer);
         if (imageData)
             return imageData;
 
         m_context->paintRenderingResultsToCanvas(sourceBuffer);
         imageData = ImageData::create(m_size);
-        RefPtr<SkImage> snapshot = buffer()->newSkImageSnapshot(PreferNoAcceleration);
+        RefPtr<SkImage> snapshot = buffer()->newSkImageSnapshot(PreferNoAcceleration, reason);
         if (snapshot) {
             SkImageInfo imageInfo = SkImageInfo::Make(width(), height(), kRGBA_8888_SkColorType, kUnpremul_SkAlphaType);
             snapshot->readPixels(imageInfo, imageData->data()->data(), imageInfo.minRowBytes(), 0, 0);
         }
         return imageData;
     }
 
     imageData = ImageData::create(m_size);
 
     if (!m_context)
         return imageData;
 
     ASSERT(m_context->is2d());
-    RefPtr<SkImage> snapshot = buffer()->newSkImageSnapshot(PreferNoAcceleration);
+    RefPtr<SkImage> snapshot = buffer()->newSkImageSnapshot(PreferNoAcceleration, reason);
     if (snapshot) {
         SkImageInfo imageInfo = SkImageInfo::Make(width(), height(), kRGBA_8888_SkColorType, kUnpremul_SkAlphaType);
         snapshot->readPixels(imageInfo, imageData->data()->data(), imageInfo.minRowBytes(), 0, 0);
     }
 
     return imageData;
 }
 
 String HTMLCanvasElement::toDataURLInternal(const String& mimeType, const double& quality, SourceDrawingBuffer sourceBuffer) const
 {
     if (!isPaintable())
         return String("data:,");
 
     String encodingMimeType = toEncodingMimeType(mimeType);
 
-    ImageData* imageData = toImageData(sourceBuffer);
+    ImageData* imageData = toImageData(sourceBuffer, SnapshotReasonToDataURL);
     ScopedDisposal<ImageData> disposer(imageData);
 
     return ImageDataBuffer(imageData->size(), imageData->data()->data()).toDataURL(encodingMimeType, quality);
 }
 
 String HTMLCanvasElement::toDataURL(const String& mimeType, const ScriptValue& qualityArgument, ExceptionState& exceptionState) const
 {
     if (!originClean()) {
         exceptionState.throwSecurityError("Tainted canvases may not be exported.");
         return String();
@@ skipping 24 matching lines @@
     double quality = UndefinedQualityValue;
     if (!qualityArgument.isEmpty()) {
         v8::Local<v8::Value> v8Value = qualityArgument.v8Value();
         if (v8Value->IsNumber()) {
             quality = v8Value.As<v8::Number>()->Value();
         }
     }
 
     String encodingMimeType = toEncodingMimeType(mimeType);
 
-    ImageData* imageData = toImageData(BackBuffer);
+    ImageData* imageData = toImageData(BackBuffer, SnapshotReasonToBlob);
     // imageData unref its data, which we still keep alive for the async toBlob thread
     ScopedDisposal<ImageData> disposer(imageData);
     // Add a ref to keep image data alive until completion of encoding
     RefPtr<DOMUint8ClampedArray> imageDataRef(imageData->data());
 
     RefPtr<CanvasAsyncBlobCreator> asyncCreatorRef = CanvasAsyncBlobCreator::create(imageDataRef.release(), encodingMimeType, imageData->size(), callback);
 
     // TODO(xlai): Remove idle-periods version of implementation completely, http://crbug.com/564218
     asyncCreatorRef->scheduleAsyncBlobCreation(false, quality);
 }
@@ skipping 226 matching lines @@
     // Subtracting two intptr_t that are known to be positive will never underflow.
     v8::Isolate::GetCurrent()->AdjustAmountOfExternalAllocatedMemory(externallyAllocatedMemory - m_externallyAllocatedMemory);
     m_externallyAllocatedMemory = externallyAllocatedMemory;
 }
 
 SkCanvas* HTMLCanvasElement::drawingCanvas() const
 {
     return buffer() ? m_imageBuffer->canvas() : nullptr;
 }
 
-void HTMLCanvasElement::disableDeferral() const
+void HTMLCanvasElement::disableDeferral(DisableDeferralReason reason) const
 {
     if (buffer())
-        m_imageBuffer->disableDeferral();
+        m_imageBuffer->disableDeferral(reason);
 }
 
 SkCanvas* HTMLCanvasElement::existingDrawingCanvas() const
 {
     if (!hasImageBuffer())
         return nullptr;
 
     return m_imageBuffer->canvas();
 }
 
@@ skipping 84 matching lines @@
 }
 
 void HTMLCanvasElement::didMoveToNewDocument(Document& oldDocument)
 {
     setObservedDocument(document());
     if (m_context)
         m_context->didMoveToNewDocument(&document());
     HTMLElement::didMoveToNewDocument(oldDocument);
 }
 
-PassRefPtr<Image> HTMLCanvasElement::getSourceImageForCanvas(SourceImageStatus* status, AccelerationHint hint) const
+PassRefPtr<Image> HTMLCanvasElement::getSourceImageForCanvas(SourceImageStatus* status, AccelerationHint hint, SnapshotReason reason) const
 {
     if (!width() || !height()) {
         *status = ZeroSizeCanvasSourceImageStatus;
         return nullptr;
     }
 
     if (!isPaintable()) {
         *status = InvalidSourceImageStatus;
         return nullptr;
     }
 
     if (!m_context) {
         *status = NormalSourceImageStatus;
         return createTransparentImage(size());
     }
 
     if (m_context->is3d()) {
         m_context->paintRenderingResultsToCanvas(BackBuffer);
     }
 
-    RefPtr<SkImage> image = buffer()->newSkImageSnapshot(hint);
+    RefPtr<SkImage> image = buffer()->newSkImageSnapshot(hint, reason);
     if (image) {
         *status = NormalSourceImageStatus;
         return StaticBitmapImage::create(image.release());
     }
 
     *status = InvalidSourceImageStatus;
     return nullptr;
 }
 
 bool HTMLCanvasElement::wouldTaintOrigin(SecurityOrigin*) const
@@ skipping 20 matching lines @@
     }
     return ImageBitmapSource::fulfillImageBitmap(scriptState, isPaintable() ? ImageBitmap::create(this, IntRect(sx, sy, sw, sh)) : nullptr);
 }
 
 bool HTMLCanvasElement::isOpaque() const
 {
     return m_context && !m_context->hasAlpha();
 }
 
 } // blink