DevTools: Fix CPU profile flamechart is empty.

Bug: 734239
Change-Id: Ia815aa693ab6719a0a26d65231db1a04c26a2c4d
Reviewed-on: https://chromium-review.googlesource.com/578513
Commit-Queue: Alexei Filippov <alph@chromium.org>
Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488294}

third_party/WebKit/Source/devtools/front_end/perf_ui/FlameChart.js

@@ -93,14 +93,15 @@ PerfUI.FlameChart = class extends UI.VBox {
     this._rulerEnabled = true;
     this._windowLeft = 0.0;
     this._windowRight = 1.0;
-    this._timeWindowLeft = 0;
-    this._timeWindowRight = Infinity;
+    this._timeWindowLeft = dataProvider.minimumBoundary();
+    this._timeWindowRight = this._timeWindowLeft + dataProvider.totalTime();
     this._rangeSelectionStart = 0;
     this._rangeSelectionEnd = 0;
     this._barHeight = 17;
     this._textBaseline = 5;
     this._textPadding = 5;
     this._markerRadius = 6;
+    this._chartViewport.setWindowTimes(this._timeWindowLeft, this._timeWindowRight);
 
     /** @const */
     this._headerLeftPadding = 6;