Update Picture documentation Enhanced comment
Update Picture documentation
Enhanced comment

Given that the SkPictures should no longer have unbalanced saves and restores
there should be no inadvertent leakage of matrix or clip state.

Note that the existing documentation was vague enough that no real substantive
changes were required to make it match the new behavior.

Change-Id: Ic2d440b3e6318ec9687c607caba05de928e08503

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base