DevTools: show progress when retrieving recorded trace events

The progress is estimated as event count divided by total buffer size.

BUG=426117

Review URL: https://codereview.chromium.org/722693002

git-svn-id: svn://svn.chromium.org/blink/trunk@185440 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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

@@ -13,10 +13,13 @@ WebInspector.TracingManager = function()
 {
     WebInspector.Object.call(this);
     this._active = false;
+    this._eventBufferSize = 0;
+    this._eventsRetrieved = 0;
     WebInspector.targetManager.observeTargets(this);
 }
 
 WebInspector.TracingManager.Events = {
+    "RetrieveEventsProgress": "RetrieveEventsProgress",
     "BufferUsage": "BufferUsage",
     "TracingStarted": "TracingStarted",
     "EventsCollected": "EventsCollected",
@@ -70,11 +73,14 @@ WebInspector.TracingManager.prototype = {
     },
 
     /**
-     * @param {number} usage
+     * @param {number=} usage
+     * @param {number=} eventCount
+     * @param {number=} percentFull
      */
-    _bufferUsage: function(usage)
+    _bufferUsage: function(usage, eventCount, percentFull)
     {
-        this.dispatchEventToListeners(WebInspector.TracingManager.Events.BufferUsage, usage);
+        this._eventBufferSize = eventCount;
+        this.dispatchEventToListeners(WebInspector.TracingManager.Events.BufferUsage, usage || percentFull);
     },
 
     /**
@@ -83,10 +89,18 @@ WebInspector.TracingManager.prototype = {
     _eventsCollected: function(events)
     {
         this.dispatchEventToListeners(WebInspector.TracingManager.Events.EventsCollected, events);
+        this._eventsRetrieved += events.length;
+        if (!this._eventBufferSize)
+            return;
+        if (this._eventsRetrieved > this._eventBufferSize)
+            this._eventsRetrieved = this._eventBufferSize;
+        this.dispatchEventToListeners(WebInspector.TracingManager.Events.RetrieveEventsProgress, this._eventsRetrieved / this._eventBufferSize);
     },
 
     _tracingComplete: function()
     {
+        this._eventBufferSize = 0;
+        this._eventsRetrieved = 0;
         this.dispatchEventToListeners(WebInspector.TracingManager.Events.TracingComplete);
     },
 
@@ -137,11 +151,13 @@ WebInspector.TracingDispatcher = function(tracingManager)
 
 WebInspector.TracingDispatcher.prototype = {
     /**
-     * @param {number} usage
+     * @param {number=} usage
+     * @param {number=} eventCount
+     * @param {number=} percentFull
      */
-    bufferUsage: function(usage)
+    bufferUsage: function(usage, eventCount, percentFull)
     {
-        this._tracingManager._bufferUsage(usage);
+        this._tracingManager._bufferUsage(usage, eventCount, percentFull);
     },
 
     /**

third_party/WebKit/Source/devtools/front_end/timeline/TimelinePanel.js

@@ -49,6 +49,7 @@ WebInspector.TimelinePanel = function()
     // Create model.
     this._tracingManager = new WebInspector.TracingManager();
     this._tracingManager.addEventListener(WebInspector.TracingManager.Events.BufferUsage, this._onTracingBufferUsage, this);
+    this._tracingManager.addEventListener(WebInspector.TracingManager.Events.RetrieveEventsProgress, this._onRetrieveEventsProgress, this);
 
     this._tracingModel = new WebInspector.TracingModel();
     this._model = new WebInspector.TimelineModel(this._tracingManager, this._tracingModel, WebInspector.TimelineUIUtils.hiddenRecordsFilter());
@@ -757,6 +758,15 @@ WebInspector.TimelinePanel.prototype = {
         this._updateProgress(WebInspector.UIString("Buffer usage %d%", Math.round(usage * 100)));
     },
 
+    /**
+     * @param {!WebInspector.Event} event
+     */
+    _onRetrieveEventsProgress: function(event)
+    {
+        var progress = /** @type {number} */ (event.data);
+        this._updateProgress(WebInspector.UIString("Retrieving events\u2026 %d%", Math.round(progress * 100)));
+    },
+
     /**
      * @param {string} progressMessage
      */

third_party/WebKit/Source/devtools/protocol.json

@@ -4378,7 +4378,9 @@
             {
                 "name": "bufferUsage",
                 "parameters": [
-                    { "name": "value", "type": "number", "description": "A number in range [0..1] that indicates the used size of event buffer as a fraction of its total size." }
+                    { "name": "percentFull", "type": "number", "optional": true, "description": "A number in range [0..1] that indicates the used size of event buffer as a fraction of its total size." },
+                    { "name": "eventCount", "type": "number", "optional": true, "description": "An approximate number of events in the trace log." },
+                    { "name": "value", "type": "number", "optional": true, "description": "A number in range [0..1] that indicates the used size of event buffer as a fraction of its total size." }
                 ],
                 "handlers": ["browser"]
             }