Add D3D version and shader models to renderer string reported by GetString.

It looks like this now:
ANGLE (NVIDIA Quadro 600 Direct3D9Ex vs_3_0 ps_3_0)

I also noticed that the strings returned by GetString are not all static so I fixed that as well.
Review URL: https://codereview.appspot.com/7068058


Author: apatrick@chromium.org <apatrick@chromium.org@736b8ea6-26fd-11df-bfd4-992fa37f6226>

Manual merge from Master by daniel@transgaming.com

git-svn-id: https://angleproject.googlecode.com/svn/branches/dx11proto@1709 736b8ea6-26fd-11df-bfd4-992fa37f6226
8 files changed