diff --git a/ui/status/completion_proto/build_completion.pb.go b/ui/status/completion_proto/build_completion.pb.go
new file mode 100644
index 0000000..526e19a
--- /dev/null
+++ b/ui/status/completion_proto/build_completion.pb.go
@@ -0,0 +1,105 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// source: build_completion.proto
+
+package soong_build_completion_status_proto
+
+import (
+	fmt "fmt"
+	proto "github.com/golang/protobuf/proto"
+	math "math"
+)
+
+// Reference imports to suppress errors if they are not otherwise used.
+var _ = proto.Marshal
+var _ = fmt.Errorf
+var _ = math.Inf
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the proto package it is being compiled against.
+// A compilation error at this line likely means your copy of the
+// proto package needs to be updated.
+const _ = proto.ProtoPackageIsVersion3 // please upgrade the proto package
+
+type BuildCompletionStatus struct {
+	// Total number of actions in a build. The total actions will increase
+	// and might decrease during the course of a build.
+	TotalActions *uint64 `protobuf:"varint,1,opt,name=total_actions,json=totalActions" json:"total_actions,omitempty"`
+	// Total number of completed build actions. This value will never decrease
+	// and finished_actions <= total_actions. At one point of the build, the
+	// finished_actions will be equal to total_actions. This may not represent
+	// that the build is completed as the total_actions may be increased for
+	// additional counted work or is doing non-counted work.
+	FinishedActions *uint64 `protobuf:"varint,2,opt,name=finished_actions,json=finishedActions" json:"finished_actions,omitempty"`
+	// Total number of current actions being executed during a course of a
+	// build and current_actions + finished_actions <= total_actions.
+	CurrentActions       *uint64  `protobuf:"varint,3,opt,name=current_actions,json=currentActions" json:"current_actions,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *BuildCompletionStatus) Reset()         { *m = BuildCompletionStatus{} }
+func (m *BuildCompletionStatus) String() string { return proto.CompactTextString(m) }
+func (*BuildCompletionStatus) ProtoMessage()    {}
+func (*BuildCompletionStatus) Descriptor() ([]byte, []int) {
+	return fileDescriptor_7f03c01d09a4e764, []int{0}
+}
+
+func (m *BuildCompletionStatus) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_BuildCompletionStatus.Unmarshal(m, b)
+}
+func (m *BuildCompletionStatus) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_BuildCompletionStatus.Marshal(b, m, deterministic)
+}
+func (m *BuildCompletionStatus) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_BuildCompletionStatus.Merge(m, src)
+}
+func (m *BuildCompletionStatus) XXX_Size() int {
+	return xxx_messageInfo_BuildCompletionStatus.Size(m)
+}
+func (m *BuildCompletionStatus) XXX_DiscardUnknown() {
+	xxx_messageInfo_BuildCompletionStatus.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_BuildCompletionStatus proto.InternalMessageInfo
+
+func (m *BuildCompletionStatus) GetTotalActions() uint64 {
+	if m != nil && m.TotalActions != nil {
+		return *m.TotalActions
+	}
+	return 0
+}
+
+func (m *BuildCompletionStatus) GetFinishedActions() uint64 {
+	if m != nil && m.FinishedActions != nil {
+		return *m.FinishedActions
+	}
+	return 0
+}
+
+func (m *BuildCompletionStatus) GetCurrentActions() uint64 {
+	if m != nil && m.CurrentActions != nil {
+		return *m.CurrentActions
+	}
+	return 0
+}
+
+func init() {
+	proto.RegisterType((*BuildCompletionStatus)(nil), "soong_build_completion_status.BuildCompletionStatus")
+}
+
+func init() { proto.RegisterFile("build_completion.proto", fileDescriptor_7f03c01d09a4e764) }
+
+var fileDescriptor_7f03c01d09a4e764 = []byte{
+	// 158 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xe2, 0x12, 0x4b, 0x2a, 0xcd, 0xcc,
+	0x49, 0x89, 0x4f, 0xce, 0xcf, 0x2d, 0xc8, 0x49, 0x2d, 0xc9, 0xcc, 0xcf, 0xd3, 0x2b, 0x28, 0xca,
+	0x2f, 0xc9, 0x17, 0x92, 0x2d, 0xce, 0xcf, 0xcf, 0x4b, 0x8f, 0x47, 0x97, 0x8d, 0x2f, 0x2e, 0x49,
+	0x2c, 0x29, 0x2d, 0x56, 0x9a, 0xc0, 0xc8, 0x25, 0xea, 0x04, 0x92, 0x73, 0x86, 0x4b, 0x05, 0x83,
+	0x65, 0x84, 0x94, 0xb9, 0x78, 0x4b, 0xf2, 0x4b, 0x12, 0x73, 0xe2, 0x13, 0x93, 0x41, 0xa2, 0xc5,
+	0x12, 0x8c, 0x0a, 0x8c, 0x1a, 0x2c, 0x41, 0x3c, 0x60, 0x41, 0x47, 0x88, 0x98, 0x90, 0x26, 0x97,
+	0x40, 0x5a, 0x66, 0x5e, 0x66, 0x71, 0x46, 0x6a, 0x0a, 0x5c, 0x1d, 0x13, 0x58, 0x1d, 0x3f, 0x4c,
+	0x1c, 0xa6, 0x54, 0x9d, 0x8b, 0x3f, 0xb9, 0xb4, 0xa8, 0x28, 0x35, 0xaf, 0x04, 0xae, 0x92, 0x19,
+	0xac, 0x92, 0x0f, 0x2a, 0x0c, 0x55, 0xe8, 0xa4, 0x1a, 0xa5, 0x8c, 0xd7, 0xcd, 0xf1, 0x60, 0x8f,
+	0x01, 0x02, 0x00, 0x00, 0xff, 0xff, 0x13, 0x08, 0x7b, 0x38, 0xf1, 0x00, 0x00, 0x00,
+}
diff --git a/ui/status/completion_proto/build_completion.proto b/ui/status/completion_proto/build_completion.proto
new file mode 100644
index 0000000..939545e
--- /dev/null
+++ b/ui/status/completion_proto/build_completion.proto
@@ -0,0 +1,35 @@
+// Copyright 2020 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+syntax = "proto2";
+
+package soong_build_completion_status;
+option go_package = "soong_build_completion_status_proto";
+
+message BuildCompletionStatus {
+  // Total number of actions in a build. The total actions will increase
+  // and might decrease during the course of a build.
+  optional uint64 total_actions = 1;
+
+  // Total number of completed build actions. This value will never decrease
+  // and finished_actions <= total_actions. At one point of the build, the
+  // finished_actions will be equal to total_actions. This may not represent
+  // that the build is completed as the total_actions may be increased for
+  // additional counted work or is doing non-counted work.
+  optional uint64 finished_actions = 2;
+
+  // Total number of current actions being executed during a course of a
+  // build and current_actions + finished_actions <= total_actions.
+  optional uint64 current_actions = 3;
+}
diff --git a/ui/status/completion_proto/regen.sh b/ui/status/completion_proto/regen.sh
new file mode 100755
index 0000000..652df08
--- /dev/null
+++ b/ui/status/completion_proto/regen.sh
@@ -0,0 +1,17 @@
+#!/bin/bash
+
+# Generates the golang source file of build_completion.proto file.
+
+set -e
+
+function die() { echo "ERROR: $1" >&2; exit 1; }
+
+readonly error_msg="Maybe you need to run 'lunch aosp_arm-eng && m aprotoc blueprint_tools'?"
+
+if ! hash aprotoc &>/dev/null; then
+  die "could not find aprotoc. ${error_msg}"
+fi
+
+if ! aprotoc --go_out=paths=source_relative:. build_completion.proto; then
+  die "build failed. ${error_msg}"
+fi