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This is because some implementations of eglGetProcAddress do not return null for entry points that are not available. This gives a convenient and efficient way of determining whether a particular entry point can be called.
Review URL: http://codereview.chromium.org/8416054

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@108153 0039d316-1c4b-4281-b951-d872f2087c98