The Skia bug was closed since this is an intended behavior. Skia does not keep a cached link to the decoded image, since the decoded image does not have some of the info set correctly, and it fails on peekPixmap. The solution to this is to create a raster version of the decoded image and access the pixmap then.

See this fiddle: https://fiddle.skia.org/c/6bc9f45f821533f128003add293c14f8

*peekPixmap* --> *peekPixels*

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/18c9afdfdca9ba786f0feed6c14074cc468984b9

commit 18c9afdfdca9ba786f0feed6c14074cc468984b9
Author: Reza.Zakerinasab <zakerinasab@chromium.org>
Date: Wed May 30 21:04:11 2018

Implement HTMLCanvaElement::convertToBlob()

HTMLCanvaElement::convertToBlob() is a new promise-based toBlob
API that allows to specify the color space and the pixel format
of the target blob.

Bug:  840372 , 847436 
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
Change-Id: I77c8b98ada3a5f9fbef38ad1b86d9ef15fdea570
Reviewed-on: https://chromium-review.googlesource.com/1048169
Commit-Queue: Mohammad Reza Zakerinasab <zakerinasab@chromium.org>
Reviewed-by: Justin Novosad <junov@chromium.org>
Reviewed-by: Mohammad Reza Zakerinasab <zakerinasab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#562990}
[add] https://crrev.com/18c9afdfdca9ba786f0feed6c14074cc468984b9/third_party/WebKit/LayoutTests/fast/canvas/color-space/canvas-colorManaged-convertToBlob-roundtrip.html
[delete] https://crrev.com/5d3781923cdbfff3a168ab1284888c01923d1543/third_party/WebKit/LayoutTests/platform/win/virtual/color_space/fast/canvas/color-space/toDataURL-color-managed-round-trip-expected.png
[modify] https://crrev.com/18c9afdfdca9ba786f0feed6c14074cc468984b9/third_party/WebKit/LayoutTests/webexposed/element-instance-property-listing-expected.txt
[modify] https://crrev.com/18c9afdfdca9ba786f0feed6c14074cc468984b9/third_party/WebKit/LayoutTests/webexposed/global-interface-listing-expected.txt
[modify] https://crrev.com/18c9afdfdca9ba786f0feed6c14074cc468984b9/third_party/blink/public/platform/web_feature.mojom
[modify] https://crrev.com/18c9afdfdca9ba786f0feed6c14074cc468984b9/third_party/blink/renderer/core/core_idl_files.gni
[modify] https://crrev.com/18c9afdfdca9ba786f0feed6c14074cc468984b9/third_party/blink/renderer/core/html/canvas/canvas_async_blob_creator.cc
[modify] https://crrev.com/18c9afdfdca9ba786f0feed6c14074cc468984b9/third_party/blink/renderer/core/html/canvas/canvas_async_blob_creator.h
[modify] https://crrev.com/18c9afdfdca9ba786f0feed6c14074cc468984b9/third_party/blink/renderer/core/html/canvas/canvas_async_blob_creator_test.cc
[modify] https://crrev.com/18c9afdfdca9ba786f0feed6c14074cc468984b9/third_party/blink/renderer/core/html/canvas/canvas_rendering_context_host.cc
[modify] https://crrev.com/18c9afdfdca9ba786f0feed6c14074cc468984b9/third_party/blink/renderer/core/html/canvas/canvas_rendering_context_host.h
[modify] https://crrev.com/18c9afdfdca9ba786f0feed6c14074cc468984b9/third_party/blink/renderer/core/html/canvas/html_canvas_element.cc
[modify] https://crrev.com/18c9afdfdca9ba786f0feed6c14074cc468984b9/third_party/blink/renderer/core/html/canvas/html_canvas_element.h
[modify] https://crrev.com/18c9afdfdca9ba786f0feed6c14074cc468984b9/third_party/blink/renderer/core/html/canvas/html_canvas_element.idl
[add] https://crrev.com/18c9afdfdca9ba786f0feed6c14074cc468984b9/third_party/blink/renderer/core/html/canvas/image_encode_options.idl
[modify] https://crrev.com/18c9afdfdca9ba786f0feed6c14074cc468984b9/third_party/blink/renderer/core/inspector/inspector_audits_agent.cc
[delete] https://crrev.com/5d3781923cdbfff3a168ab1284888c01923d1543/third_party/blink/renderer/core/offscreencanvas/image_encode_options.idl
[modify] https://crrev.com/18c9afdfdca9ba786f0feed6c14074cc468984b9/third_party/blink/renderer/core/offscreencanvas/offscreen_canvas.cc
[modify] https://crrev.com/18c9afdfdca9ba786f0feed6c14074cc468984b9/third_party/blink/renderer/core/offscreencanvas/offscreen_canvas.h
[modify] https://crrev.com/18c9afdfdca9ba786f0feed6c14074cc468984b9/third_party/blink/renderer/platform/graphics/canvas_color_params.cc
[modify] https://crrev.com/18c9afdfdca9ba786f0feed6c14074cc468984b9/third_party/blink/renderer/platform/graphics/canvas_color_params.h
[modify] https://crrev.com/18c9afdfdca9ba786f0feed6c14074cc468984b9/third_party/blink/renderer/platform/graphics/color_correction_test_utils.cc
[modify] https://crrev.com/18c9afdfdca9ba786f0feed6c14074cc468984b9/third_party/blink/renderer/platform/graphics/color_correction_test_utils.h
[modify] https://crrev.com/18c9afdfdca9ba786f0feed6c14074cc468984b9/third_party/blink/renderer/platform/graphics/image_data_buffer.cc
[modify] https://crrev.com/18c9afdfdca9ba786f0feed6c14074cc468984b9/third_party/blink/renderer/platform/graphics/image_data_buffer.h
[modify] https://crrev.com/18c9afdfdca9ba786f0feed6c14074cc468984b9/tools/metrics/histograms/enums.xml