Add glBlendBarrierKHR to Skia's GL bindings.

ui/gl/gl_bindings_skia_in_process.cc

Index: ui/gl/gl_bindings_skia_in_process.cc
diff --git a/ui/gl/gl_bindings_skia_in_process.cc b/ui/gl/gl_bindings_skia_in_process.cc
index 709c37fa9efc24fa4b62f600000ddee5f5143eaa..d0ea6140427c41afa6b22be65b8a3c1ec9f1af40 100644
--- a/ui/gl/gl_bindings_skia_in_process.cc
+++ b/ui/gl/gl_bindings_skia_in_process.cc
@@ -64,6 +64,10 @@ GLvoid StubGLBindVertexArray(GLuint array) {
   glBindVertexArrayOES(array);
 }
 
+GLvoid StubGLBlendBarrier() {
+  glBlendBarrierKHR();
+}
+
 GLvoid StubGLBlendColor(GLclampf red, GLclampf green, GLclampf blue,
                         GLclampf alpha) {
   glBlendColor(red, green, blue, alpha);
@@ -706,6 +710,7 @@ GrGLInterface* CreateInProcessSkiaGLBinding() {
   functions->fBindFragDataLocation = StubGLBindFragDataLocation;
   functions->fBindTexture = StubGLBindTexture;
   functions->fBindVertexArray = StubGLBindVertexArray;
+  functions->fBlendBarrier = StubGLBlendBarrier;
   functions->fBlendColor = StubGLBlendColor;
   functions->fBlendEquation = StubGLBlendEquation;
   functions->fBlendFunc = StubGLBlendFunc;