Fix SkGPipe drawing, and turn it on by default.

A recent change broke SkGPipe. Fix it, and turn on pipe drawing
in GM by default so we will catch these in the future.

We already had a bug where SkGPipeWriter had to use its Cross Process
flag to work, so for a quick fix, force the reader to use the Cross
Process flag as well. The bug to allow both cross and non cross process
is http://code.google.com/p/skia/issues/detail?id=663

Review URL: https://codereview.appspot.com/6333071

git-svn-id: http://skia.googlecode.com/svn/trunk@4384 2bbb7eff-a529-9590-31e7-b0007b416f81
5 files changed