Add '--dart-sdk-summary' option to analyzer-cli and use SummaryBasedDartSdk.

pkg/analyzer_cli/lib/src/build_mode.dart

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library analyzer_cli.src.build_mode;
 
 import 'dart:core' hide Resource;
 import 'dart:io' as io;
 
 import 'package:analyzer/dart/ast/ast.dart' show CompilationUnit;
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/file_system/physical_file_system.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/error.dart';
 import 'package:analyzer/src/generated/java_io.dart';
+import 'package:analyzer/src/generated/sdk.dart';
 import 'package:analyzer/src/generated/sdk_io.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/generated/source_io.dart';
 import 'package:analyzer/src/summary/format.dart';
 import 'package:analyzer/src/summary/idl.dart';
 import 'package:analyzer/src/summary/link.dart';
 import 'package:analyzer/src/summary/package_bundle_reader.dart';
 import 'package:analyzer/src/summary/summarize_ast.dart';
 import 'package:analyzer/src/summary/summarize_elements.dart';
+import 'package:analyzer/src/summary/summary_sdk.dart' show SummaryBasedDartSdk;
 import 'package:analyzer/task/dart.dart';
 import 'package:analyzer_cli/src/analyzer_impl.dart';
 import 'package:analyzer_cli/src/driver.dart';
 import 'package:analyzer_cli/src/error_formatter.dart';
 import 'package:analyzer_cli/src/options.dart';
 import 'package:bazel_worker/bazel_worker.dart';
 
 /**
  * Persistent Bazel worker.
  */
@@ skipping 194 matching lines @@
           if (processedSeverity != null) {
             maxSeverity = maxSeverity.max(processedSeverity.severity);
           }
         }
       }
     }
     return maxSeverity;
   }
 
   void _createContext() {
-    DirectoryBasedDartSdk sdk =
-        new DirectoryBasedDartSdk(new JavaFile(options.dartSdkPath));
-    sdk.analysisOptions =
-        Driver.createAnalysisOptionsForCommandLineOptions(options);
-    sdk.useSummary = !options.buildSummaryOnlyAst;
-
     // Read the summaries.
     summaryDataStore = new SummaryDataStore(options.buildSummaryInputs);
 
+    DartSdk sdk;
+    PackageBundle sdkBundle;
+    if (options.dartSdkSummaryPath != null) {
+      SummaryBasedDartSdk summarySdk =
+          new SummaryBasedDartSdk(options.dartSdkSummaryPath);
+      sdk = summarySdk;
+      sdkBundle = summarySdk.bundle;
+    } else {
+      DirectoryBasedDartSdk directorySdk =
+          new DirectoryBasedDartSdk(new JavaFile(options.dartSdkPath));
+      directorySdk.analysisOptions =
+          Driver.createAnalysisOptionsForCommandLineOptions(options);
+      directorySdk.useSummary = !options.buildSummaryOnlyAst;
+      sdk = directorySdk;
+      sdkBundle = directorySdk.getSummarySdkBundle();
+    }
+
     // In AST mode include SDK bundle to avoid parsing SDK sources.
     if (options.buildSummaryOnlyAst) {
-      summaryDataStore.addBundle(null, sdk.getSummarySdkBundle());
+      summaryDataStore.addBundle(null, sdkBundle);
     }
 
     // Create the context.
     context = AnalysisEngine.instance.createAnalysisContext();
     context.sourceFactory = new SourceFactory(<UriResolver>[
       new DartUriResolver(sdk),
       new InSummaryPackageUriResolver(summaryDataStore),
       new ExplicitSourceResolver(uriToFileMap)
     ]);
 
@@ skipping 95 matching lines @@
             'Illegal input file (must be "\$uri|\$path"): $sourceFile');
         return null;
       }
       Uri uri = Uri.parse(sourceFile.substring(0, pipeIndex));
       String path = sourceFile.substring(pipeIndex + 1);
       uriToFileMap[uri] = new JavaFile(path);
     }
     return uriToFileMap;
   }
 }