Update build_sdk_summaries to 'build' command, update help.

Change-Id: I8aac5209fc0c7c481c9bf5ffb93faef183532572
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/149482
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
Commit-Queue: Konstantin Shcheglov <scheglov@google.com>

pkg/analyzer/tool/summary/build_sdk_summaries.dart

@@ -7,7 +7,6 @@ import 'dart:io';
 import 'package:analyzer/file_system/physical_file_system.dart';
 import 'package:analyzer/src/dart/sdk/sdk.dart';
 import 'package:analyzer/src/summary/summary_file_builder.dart';
-import 'package:meta/meta.dart';
 
 void main(List<String> args) {
   String command;
@@ -41,12 +40,8 @@ void main(List<String> args) {
   //
   // Handle commands.
   //
-  if (command == 'build-strong') {
-    _buildSummary(
-      sdkPath,
-      outFilePath,
-      title: 'legacy',
-    );
+  if (command == 'build' || command == 'build-strong') {
+    _buildSummary(sdkPath, outFilePath);
   } else {
     _printUsage();
     return;
@@ -58,12 +53,8 @@ void main(List<String> args) {
  */
 const BINARY_NAME = "build_sdk_summaries";
 
-void _buildSummary(
-  String sdkPath,
-  String outPath, {
-  @required String title,
-}) {
-  print('Generating $title summary.');
+void _buildSummary(String sdkPath, String outPath) {
+  print('Generating summary.');
   Stopwatch sw = Stopwatch()..start();
   List<int> bytes = buildSdkSummary(
     resourceProvider: PhysicalResourceProvider.INSTANCE,
@@ -79,8 +70,6 @@ void _buildSummary(
 void _printUsage() {
   print('Usage: $BINARY_NAME command arguments');
   print('Where command can be one of the following:');
-  print('  build-non-nullable output_file [sdk_path]');
-  print('    Generate non-nullable summary file.');
-  print('  build-legacy output_file [sdk_path]');
-  print('    Generate legacy summary file.');
+  print('  build output_file [sdk_path]');
+  print('    Generate summary file.');
 }

utils/dartanalyzer/BUILD.gn

@@ -46,13 +46,13 @@ prebuilt_dart_action("generate_summary_strong") {
   outputs = [ output ]
   if (!dont_use_nnbd) {
     args = [
-      "build-strong",
+      "build",
       rebase_path(output),
       rebase_path("../../sdk_nnbd"),
     ]
   } else {
     args = [
-      "build-strong",
+      "build",
       rebase_path(output),
       rebase_path("../../sdk"),
     ]