Renamed gles_book_examples to gles2_book to make it shorter and more correct. I still need to rename gles_book_examples.gyp to gles2_book.gyp. I will do it in another CL as svn does not like changes in renamed directories.
TBR=apatrick
Review URL: http://codereview.chromium.org/543002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@35875 0039d316-1c4b-4281-b951-d872f2087c98