Introduce gpu_trace_event for gpu performance analysis.

chrome/browser/resources/gpu_internals/raw_events_view.js

+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+/**
+ *
+ * @fileoverview Displays the traced data in raw format. Its primarily
+ * usefulness is to allow users to copy-paste their data in an easy to
+ * read format for bug reports.
+ *
+ */
+cr.define('gpu', function() {
+  /**
+   * Provides information on the GPU process and underlying graphics hardware.
+   * @constructor
+   * @extends {gpu.Tab}
+   */
+  var RawEventsView = cr.ui.define(gpu.Tab);
+
+  RawEventsView.prototype = {
+    __proto__: gpu.Tab.prototype,
+
+    decorate: function() {
+      tracingController.addEventListener('traceBegun', this.refresh.bind(this));
+      tracingController.addEventListener('traceEnded', this.refresh.bind(this));
+      this.addEventListener('selectedChange', this.onSelectedChange_);
+      this.refresh();
+    },
+
+    onSelectedChange_: function() {
+      if (this.selected) {
+        if (!tracingController.traceEvents.length) {
+          tracingController.beginTracing();
+        }
+        if (this.needsRefreshOnShow_) {
+          this.needsRefreshOnShow_ = false;
+          this.refresh();
+        }
+      }
+    },
+
+    /**
+     * Updates the view based on its currently known data
+     */
+    refresh: function() {
+      if (this.parentNode.selectedTab != this) {
+        this.needsRefreshOnShow_ = true;
+      }
+
+      var dataElement = this.querySelector('.raw-events-view-data');
+      if (tracingController.isTracingEnabled) {
+        var tmp = 'Still tracing. ' +
+          'Uncheck the enable tracing button to see traced data.';
+        dataElement.textContent = tmp;
+      } else if (!tracingController.traceEvents.length) {
+        dataElement.textContent =
+            'No trace data collected. Collect data first.';
+      } else {
+        var events = tracingController.traceEvents;
+        var text = JSON.stringify(events);
+        dataElement.textContent = text;
+
+        var selection = window.getSelection();
+        selection.removeAllRanges();
+        var range = document.createRange();
+        range.selectNodeContents(dataElement);
+        selection.addRange(range);
+      }
+    }
+
+  };
+
+  return {
+    RawEventsView: RawEventsView
+  };
+});