doc: add instructions to capture a `.skp` from chromium
NOTRY=true
DOCS_PREVIEW= https://skia.org/user/tips?cl=1220783005
Review URL: https://codereview.chromium.org/1220783005
diff --git a/site/user/tips.md b/site/user/tips.md
index e76990b..9b86bf1 100644
--- a/site/user/tips.md
+++ b/site/user/tips.md
@@ -16,6 +16,27 @@
bitmap.extractSubset(&subset, rect);
canvas->drawBitmapNine(subset, ...);
+### Capturing a `.skp` file on a web page in Chromium.
+
+1. Launch Chrome or Chromium with `--no-sandbox --enable-gpu-benchmarking`
+2. Open the JS console (ctrl-shift-J)
+3. Execute: `chrome.gpuBenchmarking.printToSkPicture('/tmp')`
+ This returns "undefined" on success.
+
+Open the resulting file in the Skia Debugger:
+
+ bin/sync-and-gyp
+ ninja -C out/Release debugger
+ out/Release/debugger /tmp/layer_0.skp &
+
+Or use `dm` to rasterize it.
+
+ bin/sync-and-gyp
+ ninja -C out/Release dm
+ out/Release/dm --src skp --skps /tmp/layer_0.skp -w /tmp \
+ --config 8888 gpu pdf --verbose
+ ls -l /tmp/*/skp/layer_0.skp.*
+
FAQ
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