Add glGetActiveUniformBlockiv to GPU command buffer.

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 c415e48b05db6fcaac4c9989f875e86e091184b2..cb1962df85aa13b2c6e71771afec83d3fdb8a2bf 100644
--- a/gpu/command_buffer/cmd_buffer_functions.txt
+++ b/gpu/command_buffer/cmd_buffer_functions.txt
@@ -77,6 +77,7 @@ GL_APICALL void         GL_APIENTRY glGenTextures (GLsizeiNotNegative n, GLuint*
 GL_APICALL void         GL_APIENTRY glGenTransformFeedbacks (GLsizeiNotNegative n, GLuint* ids);
 GL_APICALL void         GL_APIENTRY glGetActiveAttrib (GLidProgram program, GLuint index, GLsizeiNotNegative bufsize, GLsizeiOptional* length, GLint* size, GLenum* type, char* name);
 GL_APICALL void         GL_APIENTRY glGetActiveUniform (GLidProgram program, GLuint index, GLsizeiNotNegative bufsize, GLsizeiOptional* length, GLint* size, GLenum* type, char* name);
+GL_APICALL void         GL_APIENTRY glGetActiveUniformBlockiv (GLidProgram program, GLuint index, GLenumUniformBlockParameter pname, GLint* params);
 GL_APICALL void         GL_APIENTRY glGetActiveUniformBlockName (GLidProgram program, GLuint index, GLsizeiNotNegative bufsize, GLsizeiOptional* length, char* name);
 GL_APICALL void         GL_APIENTRY glGetAttachedShaders (GLidProgram program, GLsizeiNotNegative maxcount, GLsizeiOptional* count, GLuint* shaders);
 GL_APICALL GLint        GL_APIENTRY glGetAttribLocation (GLidProgram program, const char* name);