fix for glXGetProcAddress of egl functions in glx context

src/gpu/gl/glx/GrGLCreateNativeInterface_glx.cpp

Index: src/gpu/gl/glx/GrGLCreateNativeInterface_glx.cpp
diff --git a/src/gpu/gl/glx/GrGLCreateNativeInterface_glx.cpp b/src/gpu/gl/glx/GrGLCreateNativeInterface_glx.cpp
index e3d37bd80f1efeeab81da681bab29797e4cd186c..dbe6e70d9101fe04592640d5e0759943a622659d 100644
--- a/src/gpu/gl/glx/GrGLCreateNativeInterface_glx.cpp
+++ b/src/gpu/gl/glx/GrGLCreateNativeInterface_glx.cpp
@@ -9,12 +9,16 @@
 #include "gl/GrGLInterface.h"
 #include "gl/GrGLAssembleInterface.h"
 #include "gl/GrGLUtil.h"
-
+#include <string>
 #include <GL/glx.h>
 
 static GrGLFuncPtr glx_get(void* ctx, const char name[]) {
     SkASSERT(nullptr == ctx);
     SkASSERT(glXGetCurrentContext());
+    const char *strP = strstr(name, "egl");
+    if(strP && strP == name) { //return 0 for egl functions in glx context
+        return nullptr;
+    }
     return glXGetProcAddress(reinterpret_cast<const GLubyte*>(name));
 }