Update from https://crrev.com/318214

gpu/command_buffer/cmd_buffer_functions.txt

Index: gpu/command_buffer/cmd_buffer_functions.txt
diff --git a/gpu/command_buffer/cmd_buffer_functions.txt b/gpu/command_buffer/cmd_buffer_functions.txt
index 570eff17736b5a9d300595dcee419ba9eeabc807..a03af9ec49827bd32e85f65216af4ceadae76ea2 100644
--- a/gpu/command_buffer/cmd_buffer_functions.txt
+++ b/gpu/command_buffer/cmd_buffer_functions.txt
@@ -101,6 +101,7 @@ GL_APICALL void         GL_APIENTRY glGetShaderInfoLog (GLidShader shader, GLsiz
 GL_APICALL void         GL_APIENTRY glGetShaderPrecisionFormat (GLenumShaderType shadertype, GLenumShaderPrecision precisiontype, GLint* range, GLint* precision);
 GL_APICALL void         GL_APIENTRY glGetShaderSource (GLidShader shader, GLsizeiNotNegative bufsize, GLsizeiOptional* length, char* source);
 GL_APICALL const GLubyte* GL_APIENTRY glGetString (GLenumStringType name);
+GL_APICALL void         GL_APIENTRY glGetSynciv (GLsync sync, GLenumSyncParameter pname, GLsizeiNotNegative bufsize, GLsizeiOptional* length, GLint* values);
 GL_APICALL void         GL_APIENTRY glGetTexParameterfv (GLenumGetTexParamTarget target, GLenumTextureParameter pname, GLfloat* params);
 GL_APICALL void         GL_APIENTRY glGetTexParameteriv (GLenumGetTexParamTarget target, GLenumTextureParameter pname, GLint* params);
 GL_APICALL void         GL_APIENTRY glGetTransformFeedbackVarying (GLidProgram program, GLuint index, GLsizeiNotNegative bufsize, GLsizeiOptional* length, GLsizei* size, GLenum* type, char* name);