Android EGL: Synchronize calls to eglCreateContext

webrtc/api/java/android/org/webrtc/EglBase14.java

Index: webrtc/api/java/android/org/webrtc/EglBase14.java
diff --git a/webrtc/api/java/android/org/webrtc/EglBase14.java b/webrtc/api/java/android/org/webrtc/EglBase14.java
index 6b406228ce071e20693a1908d9344ebbda45fdb5..71d6d99873616c2dccd36a4f29170caa1641ac32 100644
--- a/webrtc/api/java/android/org/webrtc/EglBase14.java
+++ b/webrtc/api/java/android/org/webrtc/EglBase14.java
@@ -246,8 +246,10 @@ public final class EglBase14 extends EglBase {
     int[] contextAttributes = {EGL14.EGL_CONTEXT_CLIENT_VERSION, 2, EGL14.EGL_NONE};
     EGLContext rootContext =
         sharedContext == null ? EGL14.EGL_NO_CONTEXT : sharedContext.egl14Context;
-    EGLContext eglContext =
-        EGL14.eglCreateContext(eglDisplay, eglConfig, rootContext, contextAttributes, 0);
+    final EGLContext eglContext;
+    synchronized (EglBase.lock) {
+      eglContext = EGL14.eglCreateContext(eglDisplay, eglConfig, rootContext, contextAttributes, 0);
+    }
     if (eglContext == EGL14.EGL_NO_CONTEXT) {
       throw new RuntimeException("Failed to create EGL context");
     }