DevTools: show progress when retrieving recorded trace events

Source/devtools/front_end/sdk/TracingManager.js

Index: Source/devtools/front_end/sdk/TracingManager.js
diff --git a/Source/devtools/front_end/sdk/TracingManager.js b/Source/devtools/front_end/sdk/TracingManager.js
index 0d31cb9882d275ce639cdf86524a202c1aa6a2f5..3e063d441ad0ace179988794fd75d51893a4cc9c 100644
--- a/Source/devtools/front_end/sdk/TracingManager.js
+++ b/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",
@@ -63,9 +66,11 @@ WebInspector.TracingManager.prototype = {
 
     /**
      * @param {number} usage
+     * @param {number} eventCount
      */
-    _bufferUsage: function(usage)
+    _bufferUsage: function(usage, eventCount)
     {
+        this._eventBufferSize = eventCount;
         this.dispatchEventToListeners(WebInspector.TracingManager.Events.BufferUsage, usage);
     },
 
@@ -75,10 +80,16 @@ WebInspector.TracingManager.prototype = {
     _eventsCollected: function(events)
     {
         this.dispatchEventToListeners(WebInspector.TracingManager.Events.EventsCollected, events);
+        this._eventsRetrieved += events.length;
+        if (this._eventsRetrieved > this._eventBufferSize)
+            this._eventsRetrieved = this._eventBufferSize;
+        this.dispatchEventToListeners(WebInspector.TracingManager.Events.RetrieveEventsProgress, this._eventsRetrieved / this._eventBufferSize);

[alph, 2014/11/12 15:41:11]

division by zero?

[yurys, 2014/11/17 12:59:37]

Done.

     },
 
     _tracingComplete: function()
     {
+        this._eventBufferSize = 0;
+        this._eventsRetrieved = 0;
         this.dispatchEventToListeners(WebInspector.TracingManager.Events.TracingComplete);
     },
 
@@ -130,10 +141,11 @@ WebInspector.TracingDispatcher = function(tracingManager)
 WebInspector.TracingDispatcher.prototype = {
     /**
      * @param {number} usage
+     * @param {number} eventCount
      */
-    bufferUsage: function(usage)
+    bufferUsage: function(usage, eventCount)
     {
-        this._tracingManager._bufferUsage(usage);
+        this._tracingManager._bufferUsage(usage, eventCount);
     },
 
     /**