DevTools: Initial implementation of line-level CPU profile.

third_party/WebKit/Source/devtools/front_end/source_frame/CodeMirrorTextEditor.js

Index: third_party/WebKit/Source/devtools/front_end/source_frame/CodeMirrorTextEditor.js
diff --git a/third_party/WebKit/Source/devtools/front_end/source_frame/CodeMirrorTextEditor.js b/third_party/WebKit/Source/devtools/front_end/source_frame/CodeMirrorTextEditor.js
index 8b6730246bfd24ec7e530708cf48f232c02e88e4..5ef29d5014453ee66888e7c815bc44e9a77917c2 100644
--- a/third_party/WebKit/Source/devtools/front_end/source_frame/CodeMirrorTextEditor.js
+++ b/third_party/WebKit/Source/devtools/front_end/source_frame/CodeMirrorTextEditor.js
@@ -1118,6 +1118,32 @@ WebInspector.CodeMirrorTextEditor.prototype = {
 
     /**
      * @param {number} lineNumber
+     * @param {string} text
+     * @param {number} intensity
+     */
+    addProfileInfo: function(lineNumber, text, intensity)
+    {
+        if (!this._hasProfileInfo)
+            this._codeMirror.setOption("gutters", ["CodeMirror-linenumbers", "CodeMirror-profile-info"]);

[lushnikov, 2016/03/02 03:19:12]

isn't refresh needed here as well?

[alph, 2016/03/02 18:34:34]

It works without it, but I'll add one to be on the safe side.

+        this._hasProfileInfo = true;
+        var testElement = createElementWithClass("div", "CodeMirror-profile-line-info");
+        testElement.textContent = text;
+        testElement.style.backgroundColor = `rgba(255, 0, 0, ${intensity.toFixed(3)})`;

[lushnikov, 2016/03/02 03:19:12]

yay, fancy strings!

+        this._codeMirror.setGutterMarker(lineNumber, "CodeMirror-profile-info", testElement);
+    },
+
+    resetProfileInfo: function()
+    {
+        if (!this._hasProfileInfo)
+            return;
+        this._hasProfileInfo = false;
+        this._codeMirror.clearGutter("CodeMirror-profile-info");
+        this._codeMirror.setOption("gutters", ["CodeMirror-linenumbers"]);
+        this._codeMirror.refresh();
+    },
+
+    /**
+     * @param {number} lineNumber
      * @param {number} columnNumber
      */
     setExecutionLocation: function(lineNumber, columnNumber)