This CL adds a check to see if the return value of GLES20.glCreateShader() is zero. Also, shaders are flagged for deletion immediately after glLinkProgram() instead of doing it in release(). BUG=b/27197590 Review URL: https://codereview.webrtc.org/1702953002 Cr-Commit-Position: refs/heads/master@{#11668}