pass context to proc for MSKP captures

Submitted with Skia side change:
https://skia-review.googlesource.com/c/skia/+/948178

Test: frameworks/base/libs/hwui/tests/scripts/skp-capture.sh PACKAGE_NAME FRAMES
Bug: 353765197

Flag: TEST_ONLY

Change-Id: I8747a7dd18d9ad929d0a1b3d554ceccba863ec88