enable profiler panel

front-end/inspector.css

@@ -3944,6 +3944,10 @@ body.inactive li.selected .bubble.search-matches {
 button.enable-toggle-status-bar-item .glyph {
 }
 
+.record-profile-status-bar-item {
+  display: none;
+}
+
 .record-profile-status-bar-item .glyph {
     -webkit-mask-image: url(Images/recordButtonGlyph.png);
 }

front-end/node/InspectorFrontendHostStub.js

@@ -107,7 +107,7 @@ WebInspector.InspectorFrontendHostStub.prototype = {
 
     hiddenPanels: function()
     {
-        return "elements,resources,timeline,profiles,network,audits";
+        return "elements,resources,timeline,network,audits";
     },
 
     inspectedURLChanged: function(url)

lib/session.js

@@ -471,8 +471,25 @@ exports.create = function (conn, debuggerPort, config) {
     },
     enableProfiler: {
       value: function(always) {
-        // TODO: evaluate if profiling is enabled
-        sendEvent('profilerWasEnabled');
+        evaluate('process.profiler !== undefined', null, function(msg) {
+          if (msg.body.value) {
+            sendEvent('profilerWasEnabled');
+          }
+          else {
+            sendEvent('showPanel', { name: 'console' });
+            sendEvent('addConsoleMessage', {
+              messageObj: {
+                source: 3,
+                type: 0,
+                level: 2,
+                line: 0,
+                url: '',
+                repeatCount: 1,
+                message: 'you must require("v8-profiler") before using the profiler'
+              }
+            });
+          }
+        });
       }
     },
     disableProfiler: {
@@ -757,6 +774,30 @@ exports.create = function (conn, debuggerPort, config) {
             }
           }
         });
+        evaluate('process.profiler.snapshotCount()', null, function(msg1) {
+          var i, count;
+          if (msg1.success) {
+            for (i = 0, count = msg1.body.value; i < count; i++) {
+              evaluate('process.profiler.getSnapshot(' + i + ')', null, function(msg){
+                if (msg.success) {
+                  var refs = {};
+                  profile = {};
+                  if (msg.refs && Array.isArray(msg.refs)) {
+                    var obj = msg.body;
+                    var objProps = obj.properties;
+                    msg.refs.forEach(function(r) {
+                      refs[r.handle] = r;
+                    });
+                    objProps.forEach(function(p) {
+                      profile[String(p.name)] = refToObject(refs[p.ref]).description;
+                    });
+                  }
+                  sendProfileHeader(parseInt(profile.uid, 10), "HEAP");
+                }
+              });
+            }
+          }
+        });
       }
     },
     getProfile: {