Reland of Extend CPU profiler with mapping ticks to source lines

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index 2c8009e1d3cd80ccadb86940476edb47a4e148be..75fc2d700acded3a5c79cc7fbccd369d073ffbec 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -7172,6 +7172,19 @@ int CpuProfileNode::GetColumnNumber() const {
 }
 
 
+unsigned int CpuProfileNode::GetHitLineCount() const {
+  const i::ProfileNode* node = reinterpret_cast<const i::ProfileNode*>(this);
+  return node->GetHitLineCount();
+}
+
+
+bool CpuProfileNode::GetLineTicks(LineTick* entries,
+                                  unsigned int length) const {
+  const i::ProfileNode* node = reinterpret_cast<const i::ProfileNode*>(this);
+  return node->GetLineTicks(entries, length);
+}
+
+
 const char* CpuProfileNode::GetBailoutReason() const {
   const i::ProfileNode* node = reinterpret_cast<const i::ProfileNode*>(this);
   return node->entry()->bailout_reason();