Rename VIEW_TYPE_APP_SHELL -> VIEW_TYPE_APP_WINDOW

An underlying string constant (kViewTypeAppShell == "SHELL") has also been
changed to kViewTypeAppWindow == "APP_WINDOW".

BUG=344067
TBR=scheib@chromium.org,phajdan.jr@chromium.org,tommi@chromium.org,avi@chromium.org

Review URL: https://codereview.chromium.org/170873005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@252413 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 252413
Enable a bunch of webgl conformance tests on Linux NVIDIA GPU bots

empty_main.vert.html
gl_position_unset.vert.html
uniform-location.html

BUG=325884
TEST=Linux NVIDIA bots
TBR=kbr@chromium.org

Review URL: https://codereview.chromium.org/168543006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@252414 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 252414