[profview] Fix the source indexing with ids.

This addresses bunch of problems introduced by the attempt to
remove indexing by function names
https://chromium-review.googlesource.com/c/1267496.

Now I tested with the right version of the file :-)

Change-Id: Idfc8a17a0890d0453d14b949388c34c36a0b64f5
Reviewed-on: https://chromium-review.googlesource.com/c/1270575Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Jaroslav Sevcik <jarin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#56463}

tools/profview/profview.js

@@ -496,7 +496,9 @@ class CallTreeView {
       nameCell.appendChild(createTypeNode(node.type));
       nameCell.appendChild(createFunctionNode(node.name, node.codeId));
       if (main.currentState.sourceData &&
-          main.currentState.sourceData.hasSource(node.name)) {
+          node.codeId >= 0 &&
+          main.currentState.sourceData.hasSource(
+              this.currentState.file.code[node.codeId].func)) {
         nameCell.appendChild(createViewSourceNode(node.codeId));
       }
 
@@ -1369,7 +1371,7 @@ class SourceData {
     this.functions = new Map();
     for (let codeId = 0; codeId < file.code.length; ++codeId) {
       let codeBlock = file.code[codeId];
-      if (codeBlock.source) {
+      if (codeBlock.source && codeBlock.func !== undefined) {
         let data = this.functions.get(codeBlock.func);
         if (!data) {
           data = new FunctionSourceData(codeBlock.source.script,
@@ -1386,7 +1388,7 @@ class SourceData {
       for (let i = 0; i < stack.length; i += 2) {
         let codeId = stack[i];
         if (codeId < 0) continue;
-        let functionid = file.code[codeId].func;
+        let functionId = file.code[codeId].func;
         if (this.functions.has(functionId)) {
           let codeOffset = stack[i + 1];
           this.functions.get(functionId).addOffsetSample(codeId, codeOffset);