dart2js: add function coverage tracking in dart2js output, dumpinfo, and

pkg/compiler/lib/src/dump_info.dart

Index: pkg/compiler/lib/src/dump_info.dart
diff --git a/pkg/compiler/lib/src/dump_info.dart b/pkg/compiler/lib/src/dump_info.dart
index 898337ba3a1143f0631d38135839300e75ad1227..94dd074fe12c6beecf564659ee868d903859078c 100644
--- a/pkg/compiler/lib/src/dump_info.dart
+++ b/pkg/compiler/lib/src/dump_info.dart
@@ -128,6 +128,7 @@ class ElementInfoCollector extends BaseElementVisitor<Info, dynamic> {
 
     FieldInfo info = new FieldInfo(
         name: element.name,
+        coverageId: '${element.hashCode}',

[sra1, 2015/08/13 22:27:26]

Add comment that this is unique.

[Siggi Cherem (dart-lang), 2015/08/13 23:40:20]

Done.

         type: '${element.type}',
         inferredType: '$inferredType',
         size: size,
@@ -268,6 +269,7 @@ class ElementInfoCollector extends BaseElementVisitor<Info, dynamic> {
 
     FunctionInfo info = new FunctionInfo(
         name: name,
+        coverageId: '${element.hashCode}',
         modifiers: modifiers,
         size: size,
         returnType: returnType,