Andoid EglBase: Detect failure to find EGL config

webrtc/api/java/android/org/webrtc/EglBase10.java

 /*
  *  Copyright 2015 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 250 matching lines @@
     }
     return eglDisplay;
   }
 
   // Return an EGLConfig, or die trying.
   private EGLConfig getEglConfig(EGLDisplay eglDisplay, int[] configAttributes) {
     EGLConfig[] configs = new EGLConfig[1];
     int[] numConfigs = new int[1];
     if (!egl.eglChooseConfig(
         eglDisplay, configAttributes, configs, configs.length, numConfigs)) {
+      throw new RuntimeException("eglChooseConfig failed");
+    }
+    if (numConfigs[0] <= 0) {
       throw new RuntimeException("Unable to find any matching EGL config");
     }
-    return configs[0];
+    final EGLConfig eglConfig = configs[0];
+    if (eglConfig == null) {
+      throw new RuntimeException("eglChooseConfig returned null");
+    }
+    return eglConfig;
   }
 
   // Return an EGLConfig, or die trying.
   private EGLContext createEglContext(
       Context sharedContext, EGLDisplay eglDisplay, EGLConfig eglConfig) {
     if (sharedContext != null && sharedContext.eglContext == EGL10.EGL_NO_CONTEXT) {
       throw new RuntimeException("Invalid sharedContext");
     }
     int[] contextAttributes = {EGL_CONTEXT_CLIENT_VERSION, 2, EGL10.EGL_NONE};
     EGLContext rootContext =
         sharedContext == null ? EGL10.EGL_NO_CONTEXT : sharedContext.eglContext;
     EGLContext eglContext =
         egl.eglCreateContext(eglDisplay, eglConfig, rootContext, contextAttributes);
     if (eglContext == EGL10.EGL_NO_CONTEXT) {
       throw new RuntimeException("Failed to create EGL context");
     }
     return eglContext;
   }
 }