Implementing FlushMappedBufferRange in GPU command buffer.

gpu/command_buffer/client/gles2_cmd_helper_autogen.h

Index: gpu/command_buffer/client/gles2_cmd_helper_autogen.h
diff --git a/gpu/command_buffer/client/gles2_cmd_helper_autogen.h b/gpu/command_buffer/client/gles2_cmd_helper_autogen.h
index 2071931a4c36ef6ddf5b0995f45daea1c35fa8b2..0d594bea8af8544a9caa8207e203c134cd677841 100644
--- a/gpu/command_buffer/client/gles2_cmd_helper_autogen.h
+++ b/gpu/command_buffer/client/gles2_cmd_helper_autogen.h
@@ -2414,6 +2414,14 @@ void UnmapBuffer(GLenum target) {
   }
 }
 
+void FlushMappedBufferRange(GLenum target, GLintptr offset, GLsizeiptr size) {
+  gles2::cmds::FlushMappedBufferRange* c =
+      GetCmdSpace<gles2::cmds::FlushMappedBufferRange>();
+  if (c) {
+    c->Init(target, offset, size);
+  }
+}
+
 void ResizeCHROMIUM(GLuint width,
                     GLuint height,
                     GLfloat scale_factor,