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 6da9478466bbea64224d76393565ce4e5f16195a..fe44954263cc4a670e6506e159e72522164af2d6 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);
@@ -673,6 +677,7 @@ GrGLInterface* CreateInProcessSkiaGLBinding() {
   functions->fBindFragDataLocation = StubGLBindFragDataLocation;
   functions->fBindTexture = StubGLBindTexture;
   functions->fBindVertexArray = StubGLBindVertexArray;
+  functions->fBlendBarrier = StubGLBlendBarrier;
   functions->fBlendColor = StubGLBlendColor;
   functions->fBlendEquation = StubGLBlendEquation;
   functions->fBlendFunc = StubGLBlendFunc;