Make console.timeline/timelineEnd work for Timeline based on trace events

BUG=398787

Review URL: https://codereview.chromium.org/462603002

git-svn-id: svn://svn.chromium.org/blink/trunk@179964 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/core/inspector/InspectorConsoleAgent.cpp

@@ -126,6 +126,7 @@ void InspectorConsoleAgent::disable(ErrorString*)
     if (!(--s_enabledAgentCount))
         ScriptController::setCaptureCallStackForUncaughtExceptions(false);
     m_state->setBoolean(ConsoleAgentState::consoleMessagesEnabled, false);
+    m_state->setBoolean(ConsoleAgentState::tracingBasedTimeline, false);
 }
 
 void InspectorConsoleAgent::clearMessages(ErrorString*)

third_party/WebKit/Source/devtools/front_end/sdk/Target.js

@@ -30,6 +30,8 @@ WebInspector.Target = function(name, connection, callback)
     if (WebInspector.experimentsSettings.timelinePowerProfiler.isEnabled())
         this.powerAgent().canProfilePower(this._initializeCapability.bind(this, WebInspector.Target.Capabilities.CanProfilePower, null));
     this.workerAgent().canInspectWorkers(this._initializeCapability.bind(this, WebInspector.Target.Capabilities.CanInspectWorkers, this._loadedWithCapabilities.bind(this, callback)));
+    if (WebInspector.experimentsSettings.timelineOnTraceEvents.isEnabled())
+        this.consoleAgent().setTracingBasedTimeline(true);
 
     /** @type {!WebInspector.Lock} */
     this.profilingLock = new WebInspector.Lock();