Add support for reading non-rendertarget textures.

Also removes rendertarget flag from GrAtlas texture creation (no
longer needed) and re-enables GrFontCache::dump().

R=robertphillips@google.com

Author: jvanverth@google.com

Review URL: https://codereview.chromium.org/29263004

git-svn-id: http://skia.googlecode.com/svn/trunk@11917 2bbb7eff-a529-9590-31e7-b0007b416f81
3 files changed