There appears to also be problems in ANGLE which have not been addressed yet, specifically GL_RGB textures are allocated D3DFMT_A8R8G8B8 instead of D3DFMT_X8R8G8B8.

Prevent saved and target offscreen resources from being destroyed if we don't have a context.

TEST=try, run demos locally
BUG=61441

Review URL: http://codereview.chromium.org/4246001

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@64940 0039d316-1c4b-4281-b951-d872f2087c98