add rect-output parameter to isRect, allowing us to return the correct bounds even if a rectagular path has a trailing moveTo

 https://code.google.com/p/chromium/issues/detail?id=247770

R=caryclark@google.com

Review URL: https://codereview.chromium.org/16950021

git-svn-id: http://skia.googlecode.com/svn/trunk/include@9724 2bbb7eff-a529-9590-31e7-b0007b416f81
1 file changed