[inspector] extend protocol for code coverage.

test/mjsunit/code-coverage-precise.js

Index: test/mjsunit/code-coverage-precise.js
diff --git a/test/mjsunit/code-coverage-precise.js b/test/mjsunit/code-coverage-precise.js
index a25542dae968c6803fa78682fb19c9a3d6ff2805..03015f920268a3fde60eea7052ca54f46c2cabba 100644
--- a/test/mjsunit/code-coverage-precise.js
+++ b/test/mjsunit/code-coverage-precise.js
@@ -8,39 +8,21 @@
 
 function GetCoverage(source) {
   for (var script of %DebugCollectCoverage()) {
-    if (script.script.source == source) return script.toplevel;
+    if (script.script.source == source) return script;
   }
   return undefined;
 }
 
-function ApplyCoverageToSource(source, range) {
-  var content = "";
-  var cursor = range.start;
-  if (range.inner) for (var inner of range.inner) {
-    content += source.substring(cursor, inner.start);
-    content += ApplyCoverageToSource(source, inner);
-    cursor = inner.end;
-  }
-  content += source.substring(cursor, range.end);
-  return `[${content}](${range.name}:${range.count})`;
-}
-
 function TestCoverage(name, source, expectation) {
   source = source.trim();
   eval(source);
-  %CollectGarbage("remove dead objects");
+  %CollectGarbage("collect dead objects");
   var coverage = GetCoverage(source);
-  if (expectation === undefined) {
-    assertEquals(undefined, coverage);
-  } else {
-    expectation = expectation.trim();
-    var result = ApplyCoverageToSource(source, coverage);
-    print(result);
-    assertEquals(expectation, result, name + " failed");
-  }
+  var result = JSON.stringify(coverage);
+  print(result);
+  assertEquals(JSON.stringify(expectation), result, name + " failed");
 }
 
-
 // Without precise coverage enabled, we lose coverage data to the GC.
 TestCoverage(
 "call an IIFE",
@@ -69,9 +51,7 @@ TestCoverage(
 `
 (function f() {})();
 `,
-`
-[([function f() {}](f:1))();](:1)
-`
+[{"start":0,"end":20,"count":1},{"start":1,"end":16,"count":1}]
 );
 
 TestCoverage(
@@ -82,12 +62,7 @@ for (var i = 0; i < 10; i++) {
   i += f();
 }
 `,
-`
-[for (var i = 0; i < 10; i++) {
-  let f = [() => 1](f:5);
-  i += f();
-}](:1)
-`
+[{"start":0,"end":63,"count":1},{"start":41,"end":48,"count":5}]
 );
 
 %DebugTogglePreciseCoverage(false);