Add ES3 commands GetVertexAttribI{u}iv 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 463596a37f2758fdcc19b7fabb475bcddea87282..a7ec6cebbf1325691bdd2050d767c3cd87462b8a 100644
--- a/gpu/command_buffer/cmd_buffer_functions.txt
+++ b/gpu/command_buffer/cmd_buffer_functions.txt
@@ -119,6 +119,8 @@ GL_APICALL void         GL_APIENTRY glGetUniformIndices (GLidProgram program, GL
 GL_APICALL GLint        GL_APIENTRY glGetUniformLocation (GLidProgram program, const char* name);
 GL_APICALL void         GL_APIENTRY glGetVertexAttribfv (GLuint index, GLenumVertexAttribute pname, GLfloat* params);
 GL_APICALL void         GL_APIENTRY glGetVertexAttribiv (GLuint index, GLenumVertexAttribute pname, GLint* params);
+GL_APICALL void         GL_APIENTRY glGetVertexAttribIiv (GLuint index, GLenumVertexAttribute pname, GLint* params);
+GL_APICALL void         GL_APIENTRY glGetVertexAttribIuiv (GLuint index, GLenumVertexAttribute pname, GLuint* params);
 GL_APICALL void         GL_APIENTRY glGetVertexAttribPointerv (GLuint index, GLenumVertexPointer pname, void** pointer);
 GL_APICALL void         GL_APIENTRY glHint (GLenumHintTarget target, GLenumHintMode mode);
 GL_APICALL void         GL_APIENTRY glInvalidateFramebuffer (GLenumInvalidateFrameBufferTarget target, GLsizeiNotNegative count, const GLenum* attachments);