Add display list fallback reason histograms for 2D canvas

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

Index: third_party/WebKit/Source/core/html/HTMLCanvasElement.cpp
diff --git a/third_party/WebKit/Source/core/html/HTMLCanvasElement.cpp b/third_party/WebKit/Source/core/html/HTMLCanvasElement.cpp
index 07a62ea5587f2ff592a812e4e0c7b9b6349a9656..62cc704cc60108ba6e859f57d1a3bff6ed96339b 100644
--- a/third_party/WebKit/Source/core/html/HTMLCanvasElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLCanvasElement.cpp
@@ -432,7 +432,7 @@ void HTMLCanvasElement::notifyListenersCanvasChanged()
 
     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();
@@ -513,7 +513,7 @@ void HTMLCanvasElement::prepareSurfaceForPaintingIfNeeded() const
         m_imageBuffer->prepareSurfaceForPaintingIfNeeded();
 }
 
-ImageData* HTMLCanvasElement::toImageData(SourceDrawingBuffer sourceBuffer) const
+ImageData* HTMLCanvasElement::toImageData(SourceDrawingBuffer sourceBuffer, SnapshotReason reason) const
 {
     ImageData* imageData;
     if (is3D()) {
@@ -524,7 +524,7 @@ ImageData* HTMLCanvasElement::toImageData(SourceDrawingBuffer sourceBuffer) cons
 
         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);
@@ -538,7 +538,7 @@ ImageData* HTMLCanvasElement::toImageData(SourceDrawingBuffer sourceBuffer) cons
         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);
@@ -554,7 +554,7 @@ String HTMLCanvasElement::toDataURLInternal(const String& mimeType, const double
 
     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);
@@ -599,7 +599,7 @@ void HTMLCanvasElement::toBlob(FileCallback* callback, const String& mimeType, c
 
     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
@@ -846,10 +846,10 @@ 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
@@ -954,7 +954,7 @@ void HTMLCanvasElement::didMoveToNewDocument(Document& oldDocument)
     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;
@@ -975,7 +975,7 @@ PassRefPtr<Image> HTMLCanvasElement::getSourceImageForCanvas(SourceImageStatus*
         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());