Stop running pub get at gclient sync time and fix build bugs

mojo/public/dart/third_party/analyzer/lib/src/task/general.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.src.task.general;
+
+import 'package:analyzer/src/generated/engine.dart' hide AnalysisTask;
+import 'package:analyzer/src/generated/source.dart';
+import 'package:analyzer/task/general.dart';
+import 'package:analyzer/task/model.dart';
+
+/**
+ * A task that gets the contents of the source associated with an analysis
+ * target.
+ */
+class GetContentTask extends SourceBasedAnalysisTask {
+  /**
+   * The task descriptor describing this kind of task.
+   */
+  static final TaskDescriptor DESCRIPTOR = new TaskDescriptor('GetContentTask',
+      createTask, buildInputs, <ResultDescriptor>[CONTENT, MODIFICATION_TIME]);
+
+  /**
+   * Initialize a newly created task to access the content of the source
+   * associated with the given [target] in the given [context].
+   */
+  GetContentTask(AnalysisContext context, AnalysisTarget target)
+      : super(context, target);
+
+  @override
+  TaskDescriptor get descriptor => DESCRIPTOR;
+
+  @override
+  internalPerform() {
+    Source source = getRequiredSource();
+    try {
+      TimestampedData<String> data = context.getContents(source);
+      outputs[CONTENT] = data.data;
+      outputs[MODIFICATION_TIME] = data.modificationTime;
+    } catch (exception) {
+      outputs[CONTENT] = '';
+      outputs[MODIFICATION_TIME] = -1;
+    }
+  }
+
+  /**
+   * Return a map from the names of the inputs of this kind of task to the task
+   * input descriptors describing those inputs for a task with the given [target].
+   */
+  static Map<String, TaskInput> buildInputs(AnalysisTarget target) {
+    return <String, TaskInput>{};
+  }
+
+  /**
+   * Create a [GetContentTask] based on the given [target] in the given
+   * [context].
+   */
+  static GetContentTask createTask(
+      AnalysisContext context, AnalysisTarget target) {
+    return new GetContentTask(context, target);
+  }
+}
+
+/**
+ * A base class for analysis tasks whose target is expected to be a source.
+ */
+abstract class SourceBasedAnalysisTask extends AnalysisTask {
+  /**
+   * Initialize a newly created task to perform analysis within the given
+   * [context] in order to produce results for the given [target].
+   */
+  SourceBasedAnalysisTask(AnalysisContext context, AnalysisTarget target)
+      : super(context, target);
+
+  @override
+  String get description {
+    Source source = target.source;
+    String sourceName = source == null ? '<unknown source>' : source.fullName;
+    return '${descriptor.name} for source $sourceName';
+  }
+}