dart2js send stats, includes:

pkg/compiler/lib/src/compiler.dart

Index: pkg/compiler/lib/src/compiler.dart
diff --git a/pkg/compiler/lib/src/compiler.dart b/pkg/compiler/lib/src/compiler.dart
index d716c3e4eaf0e593ddf23b28f53a1cc77a066dd8..e1dc8cfb46a323b4a0f09cba434160ac9aa14e39 100644
--- a/pkg/compiler/lib/src/compiler.dart
+++ b/pkg/compiler/lib/src/compiler.dart
@@ -712,6 +712,7 @@ abstract class Compiler implements DiagnosticListener {
   final bool enableTypeAssertions;
   final bool enableUserAssertions;
   final bool trustTypeAnnotations;
+  final bool computeAnalysisStats;
   final bool trustPrimitives;
   final bool enableConcreteTypeInference;
   final bool disableTypeInferenceFlag;
@@ -742,7 +743,11 @@ abstract class Compiler implements DiagnosticListener {
    * If true, stop compilation after type inference is complete. Used for
    * debugging and testing purposes only.
    */
-  bool stopAfterTypeInference = false;
+  bool stopAfterTypeInference =
+      // TODO(sigmund): remove this initializer (currently
+      // compute_analysis_stats is used to retreive data and stop after
+      // inference.)
+      const bool.fromEnvironment('compute_analysis_stats');
 
   /**
    * If [:true:], comment tokens are collected in [commentMap] during scanning.
@@ -968,6 +973,7 @@ abstract class Compiler implements DiagnosticListener {
   DeferredLoadTask deferredLoadTask;
   MirrorUsageAnalyzerTask mirrorUsageAnalyzerTask;
   DumpInfoTask dumpInfoTask;
+  StatsBuilderTask statsBuilderTask;
   String buildId;
 
   /// A customizable filter that is applied to enqueued work items.
@@ -1033,6 +1039,10 @@ abstract class Compiler implements DiagnosticListener {
   Compiler({this.enableTypeAssertions: false,
             this.enableUserAssertions: false,
             this.trustTypeAnnotations: false,
+            // TODO(sigmund): eventually add a flag for this or merge with
+            // DumpInfo
+            this.computeAnalysisStats:
+                const bool.fromEnvironment('compute_analysis_stats'),
             this.trustPrimitives: false,
             this.enableConcreteTypeInference: false,
             bool disableTypeInferenceFlag: false,
@@ -1130,6 +1140,7 @@ abstract class Compiler implements DiagnosticListener {
       mirrorUsageAnalyzerTask = new MirrorUsageAnalyzerTask(this),
       enqueuer = new EnqueueTask(this),
       dumpInfoTask = new DumpInfoTask(this),
+      statsBuilderTask = new StatsBuilderTask(this),
       reuseLibraryTask = new GenericTask('Reuse library', this),
     ];
 
@@ -1518,6 +1529,7 @@ abstract class Compiler implements DiagnosticListener {
     }).then((_) {
       compileLoadedLibraries();
     });
+
   }
 
   void computeMain() {
@@ -1657,6 +1669,8 @@ abstract class Compiler implements DiagnosticListener {
     log('Inferring types...');
     typesTask.onResolutionComplete(mainFunction);
 
+    statsBuilderTask.run();
+
     if (stopAfterTypeInference) return;
 
     backend.onTypeInferenceComplete();