DM::SKPSrc::size() reports correct size.

Also, DM::GPUSink and DM::RasterSink crop DM::Src::size() to 2048x2048.

Motivation:
  Improve PDF testing by printing the entire SKP.

Source: http://crrev.com/863243004

BUG=skia:3365

Committed: https://skia.googlesource.com/skia/+/441b10eac09a1f44983e35da827a6b438a409e63

CQ_EXTRA_TRYBOTS=client.skia:Test-Ubuntu12-ShuttleA-GTX660-x86-Release-Trybot

Review URL: https://codereview.chromium.org/863243005
2 files changed