This doesn't seem too unbelievable to me. Skia includes appear in platform and gfx code, which is then included in almost all of Blink and a bunch of chromium. Just SkColor alone hits a huge amount of code.

One thing to look at is whether we can trim the header includes some (use fwdecl instead).

Yep, that's one of my hopes. Unfortunately sk_sp<> seems to need #includes where skia::RefPtr could make do with forward declarations.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/1a794d387568cadc30e8e585dec2f6514ddef821

commit 1a794d387568cadc30e8e585dec2f6514ddef821
Author: tomhudson <tomhudson@google.com>
Date: Thu Apr 28 18:19:18 2016

Trim Skia dependencies in Blink

Reduce coupling by removing Skia #includes from headers, switching to the *correct* Skia #includes, or changing to
forward declarations.

R=fmalita@chromium.org,junov@chromium.org
BUG= 604716 

Review-Url: https://codereview.chromium.org/1913283002
Cr-Commit-Position: refs/heads/master@{#390423}

[modify] https://crrev.com/1a794d387568cadc30e8e585dec2f6514ddef821/third_party/WebKit/Source/core/frame/ImageBitmap.cpp
[modify] https://crrev.com/1a794d387568cadc30e8e585dec2f6514ddef821/third_party/WebKit/Source/core/frame/ImageBitmapTest.cpp
[modify] https://crrev.com/1a794d387568cadc30e8e585dec2f6514ddef821/third_party/WebKit/Source/core/html/canvas/CanvasDrawListener.h
[modify] https://crrev.com/1a794d387568cadc30e8e585dec2f6514ddef821/third_party/WebKit/Source/core/imagebitmap/ImageBitmapFactories.h
[modify] https://crrev.com/1a794d387568cadc30e8e585dec2f6514ddef821/third_party/WebKit/Source/modules/canvas2d/CanvasStyle.cpp
[modify] https://crrev.com/1a794d387568cadc30e8e585dec2f6514ddef821/third_party/WebKit/Source/modules/csspaint/PaintRenderingContext2D.h
[modify] https://crrev.com/1a794d387568cadc30e8e585dec2f6514ddef821/third_party/WebKit/Source/platform/DragImageTest.cpp
[modify] https://crrev.com/1a794d387568cadc30e8e585dec2f6514ddef821/third_party/WebKit/Source/platform/graphics/BitmapImageTest.cpp
[modify] https://crrev.com/1a794d387568cadc30e8e585dec2f6514ddef821/third_party/WebKit/Source/platform/graphics/Canvas2DLayerBridge.h
[modify] https://crrev.com/1a794d387568cadc30e8e585dec2f6514ddef821/third_party/WebKit/Source/platform/graphics/DeferredImageDecoder.h
[modify] https://crrev.com/1a794d387568cadc30e8e585dec2f6514ddef821/third_party/WebKit/Source/platform/graphics/FrameData.cpp
[modify] https://crrev.com/1a794d387568cadc30e8e585dec2f6514ddef821/third_party/WebKit/Source/platform/graphics/FrameData.h
[modify] https://crrev.com/1a794d387568cadc30e8e585dec2f6514ddef821/third_party/WebKit/Source/platform/graphics/GraphicsLayer.h
[modify] https://crrev.com/1a794d387568cadc30e8e585dec2f6514ddef821/third_party/WebKit/Source/platform/graphics/GraphicsTypes.h
[modify] https://crrev.com/1a794d387568cadc30e8e585dec2f6514ddef821/third_party/WebKit/Source/platform/graphics/Image.h
[modify] https://crrev.com/1a794d387568cadc30e8e585dec2f6514ddef821/third_party/WebKit/Source/platform/graphics/ImageFrameGenerator.cpp
[modify] https://crrev.com/1a794d387568cadc30e8e585dec2f6514ddef821/third_party/WebKit/Source/platform/graphics/ImageFrameGenerator.h
[modify] https://crrev.com/1a794d387568cadc30e8e585dec2f6514ddef821/third_party/WebKit/Source/platform/graphics/PaintGeneratedImage.h
[modify] https://crrev.com/1a794d387568cadc30e8e585dec2f6514ddef821/third_party/WebKit/Source/platform/graphics/RecordingImageBufferSurface.h
[modify] https://crrev.com/1a794d387568cadc30e8e585dec2f6514ddef821/third_party/WebKit/Source/platform/graphics/ReplayingCanvas.h
[modify] https://crrev.com/1a794d387568cadc30e8e585dec2f6514ddef821/third_party/WebKit/Source/platform/graphics/StrokeData.cpp
[modify] https://crrev.com/1a794d387568cadc30e8e585dec2f6514ddef821/third_party/WebKit/Source/platform/graphics/StrokeData.h
[modify] https://crrev.com/1a794d387568cadc30e8e585dec2f6514ddef821/third_party/WebKit/Source/platform/graphics/skia/ImagePixelLocker.h
[modify] https://crrev.com/1a794d387568cadc30e8e585dec2f6514ddef821/third_party/WebKit/Source/platform/graphics/skia/SkiaUtils.h
[modify] https://crrev.com/1a794d387568cadc30e8e585dec2f6514ddef821/third_party/WebKit/Source/platform/image-decoders/ImageDecoderTestHelpers.h
[modify] https://crrev.com/1a794d387568cadc30e8e585dec2f6514ddef821/third_party/WebKit/public/platform/WebDisplayItemList.h

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/7e34e79b1d047678d872ae73c70d3870fef27693

commit 7e34e79b1d047678d872ae73c70d3870fef27693
Author: tomhudson <tomhudson@google.com>
Date: Fri May 27 02:02:48 2016

Remove unused Skia headers from Blink

skia/ext/refptr.h is being deprecated, and was no longer used anyway
in the files in question.

TBR=fmalita@chromium.org
BUG= 604716 ,skia:5077

Review-Url: https://codereview.chromium.org/2018673002
Cr-Commit-Position: refs/heads/master@{#396352}

[modify] https://crrev.com/7e34e79b1d047678d872ae73c70d3870fef27693/third_party/WebKit/Source/platform/graphics/CompositorFilterOperations.cpp
[modify] https://crrev.com/7e34e79b1d047678d872ae73c70d3870fef27693/third_party/WebKit/Source/platform/graphics/compositing/PaintArtifactCompositor.cpp

There doesn't seem to be a lot of easy win here, and I don't expect to spend time working on it; closing.