Ensure playing back a picture always balances saves and restores

This "fixes" the legacy interface's possible creation of pictures with unbalanced save/restores.

The Android dox will need to be updated once/if this lands.

R=reed@google.com, scroggo@google.com

Author: robertphillips@google.com

Review URL: https://codereview.chromium.org/286033005

git-svn-id: http://skia.googlecode.com/svn/trunk@14772 2bbb7eff-a529-9590-31e7-b0007b416f81
2 files changed