Rename from "(un)lock" to "(un)map" for geometry buffers.

This better reflects OpenGL terminology and is less overloaded ("lock" is used w.r.t. the resource cache).

R=robertphillips@google.com

Author: bsalomon@google.com

Review URL: https://codereview.chromium.org/275493004

git-svn-id: http://skia.googlecode.com/svn/trunk@14628 2bbb7eff-a529-9590-31e7-b0007b416f81
17 files changed