Add display list fallback reason histograms for 2D canvas

third_party/WebKit/Source/core/frame/ImageBitmap.cpp

Index: third_party/WebKit/Source/core/frame/ImageBitmap.cpp
diff --git a/third_party/WebKit/Source/core/frame/ImageBitmap.cpp b/third_party/WebKit/Source/core/frame/ImageBitmap.cpp
index 8b15261e63ae2965a1dc172c04c2f1c6d0f94da7..23ebeb37bbe12a6800d05829f6ceaa223110d134 100644
--- a/third_party/WebKit/Source/core/frame/ImageBitmap.cpp
+++ b/third_party/WebKit/Source/core/frame/ImageBitmap.cpp
@@ -65,7 +65,7 @@ ImageBitmap::ImageBitmap(HTMLVideoElement* video, const IntRect& cropRect, Docum
 
     IntPoint dstPoint = IntPoint(std::max(0, -cropRect.x()), std::max(0, -cropRect.y()));
     video->paintCurrentFrame(buffer->canvas(), IntRect(dstPoint, srcRect.size()), nullptr);
-    m_image = StaticBitmapImage::create(buffer->newSkImageSnapshot(PreferNoAcceleration));
+    m_image = StaticBitmapImage::create(buffer->newSkImageSnapshot(PreferNoAcceleration, SnapshotReasonUnknown));
     m_image->setOriginClean(!video->wouldTaintOrigin(document->securityOrigin()));
 }
 
@@ -85,7 +85,7 @@ ImageBitmap::ImageBitmap(ImageData* data, const IntRect& cropRect)
         return;
 
     if (srcRect.isEmpty()) {
-        m_image = StaticBitmapImage::create(buffer->newSkImageSnapshot(PreferNoAcceleration));
+        m_image = StaticBitmapImage::create(buffer->newSkImageSnapshot(PreferNoAcceleration, SnapshotReasonUnknown));
         return;
     }
 
@@ -95,7 +95,7 @@ ImageBitmap::ImageBitmap(ImageData* data, const IntRect& cropRect)
     if (cropRect.y() < 0)
         dstPoint.setY(-cropRect.y());
     buffer->putByteArray(Unmultiplied, data->data()->data(), data->size(), srcRect, dstPoint);
-    m_image = StaticBitmapImage::create(buffer->newSkImageSnapshot(PreferNoAcceleration));
+    m_image = StaticBitmapImage::create(buffer->newSkImageSnapshot(PreferNoAcceleration, SnapshotReasonUnknown));
 }
 
 ImageBitmap::ImageBitmap(ImageBitmap* bitmap, const IntRect& cropRect)
@@ -204,7 +204,7 @@ void ImageBitmap::notifyImageSourceChanged()
 {
 }
 
-PassRefPtr<Image> ImageBitmap::getSourceImageForCanvas(SourceImageStatus* status, AccelerationHint) const
+PassRefPtr<Image> ImageBitmap::getSourceImageForCanvas(SourceImageStatus* status, AccelerationHint, SnapshotReason) const
 {
     *status = NormalSourceImageStatus;
     return m_image ? m_image : nullptr;