[MB-30395] Use js_app.html as the landing page for debugger

* As per nodejs/node#21385 and
  https://chromium.googlesource.com/chromium/src/+/f7efc442c8dc9108f057144983987e74ddc6a0d4
  we need to use js_app.html instead of inspector.html
* This patch also fixes the inconsistency in symbol mapping
  caused due to adding handler headers.

Change-Id: I23884175d7e8ce9fa798869659b44ba2a0ee0dca
Reviewed-on: http://review.couchbase.org/97722
Well-Formed: Build Bot <build@couchbase.com>
Reviewed-by: Sriram Melkote <siri@couchbase.com>
Tested-by: Gautham B A <gautham.bangalore@gmail.com>

third_party/inspector/inspector_socket_server.cc

@@ -106,7 +106,7 @@ void PrintDebuggerReadyMessage(const std::string& host,
   for (const std::string& id : ids) {
     std::string frontend_url;
     frontend_url = "chrome-devtools://devtools/bundled";
-    frontend_url += "/inspector.html?experiments=true&v8only=true&ws=";
+    frontend_url += "/js_app.html?experiments=true&v8only=true&ws=";
     frontend_url += FormatWsAddress(host, port, id, false);
     fprintf(out, "%s\n", frontend_url.c_str());
     fprintf(stderr, "Debugger starting on %s\n", frontend_url.c_str());
@@ -384,7 +384,7 @@ void InspectorSocketServer::SendListResponse(InspectorSocket* socket) {
       GetSocketHost(&socket->tcp, &host);
       std::ostringstream frontend_url;
       frontend_url << "chrome-devtools://devtools/bundled";
-      frontend_url << "/inspector.html?experiments=true&v8only=true&ws=";
+      frontend_url << "/js_app.html?experiments=true&v8only=true&ws=";
       frontend_url << FormatWsAddress(host, port, id, false);
       target_map["devtoolsFrontendUrl"] += frontend_url.str();
       target_map["webSocketDebuggerUrl"] =

v8_consumer/src/transpiler.cc

@@ -162,10 +162,12 @@ std::string Transpiler::JsFormat(const std::string &handler_code) {
 std::string Transpiler::GetSourceMap(const std::string &handler_code,
                                      const std::string &src_filename) {
   v8::HandleScope handle_scope(isolate_);
-  v8::Local<v8::Value> args[2];
+  v8::Local<v8::Value> args[4];
   args[0] = v8Str(isolate_, handler_code);
   args[1] = v8Str(isolate_, src_filename);
-  auto result = ExecTranspiler("getSourceMap", args, 2);
+  args[2] = v8Array(isolate_, handler_headers_);
+  args[3] = v8Array(isolate_, handler_footers_);
+  auto result = ExecTranspiler("getSourceMap", args, 4);
   v8::String::Utf8Value utf8result(result);
 
   return *utf8result;

v8_consumer/src/transpiler.js

@@ -99,7 +99,8 @@ function jsFormat(code) {
     return escodegen.generate(ast);
 }
 
-function getSourceMap(code, sourceFileName) {
+function getSourceMap(code, sourceFileName, headers, footers) {
+    code = AddHeadersAndFooters(code, headers, footers);
     var ast = getAst(code, sourceFileName);
     return escodegen.generate(ast, {
         sourceMap: true,