Android EGL: Synchronize calls to eglCreateContext

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

Index: webrtc/api/java/android/org/webrtc/EglBase10.java
diff --git a/webrtc/api/java/android/org/webrtc/EglBase10.java b/webrtc/api/java/android/org/webrtc/EglBase10.java
index 70f9eb73a65ff871574d9d72aa90567a0a0d1573..8a95b03eaf263d74f723d202ed42da9b68994053 100644
--- a/webrtc/api/java/android/org/webrtc/EglBase10.java
+++ b/webrtc/api/java/android/org/webrtc/EglBase10.java
@@ -289,8 +289,10 @@ final class EglBase10 extends EglBase {
     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);
+    final EGLContext eglContext;
+    synchronized (EglBase.lock) {
+      eglContext = egl.eglCreateContext(eglDisplay, eglConfig, rootContext, contextAttributes);
+    }
     if (eglContext == EGL10.EGL_NO_CONTEXT) {
       throw new RuntimeException("Failed to create EGL context");
     }