Add Xlib support to viewer

tools/viewer/Viewer.cpp

 /*
 * Copyright 2016 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
 
 #include "Viewer.h"
 
 #include "GMSlide.h"
@@ skipping 339 matching lines @@
                          SkIntToScalar(x), SkIntToScalar(endY), paint);
         i++;
         i &= (kMeasurementCount - 1);  // fast mod
         x += xStep;
     } while (i != fCurrentMeasurement);
 
     canvas->restore();
 }
 
 void Viewer::onIdle(double ms) {
-    // Record measurements
-    fMeasurements[fCurrentMeasurement++] = ms;
-    fCurrentMeasurement &= (kMeasurementCount - 1);  // fast mod
-    SkASSERT(fCurrentMeasurement < kMeasurementCount);
+    if (ms > 1.0) {
+        // Record measurements
+        fMeasurements[fCurrentMeasurement++] = ms;
+        fCurrentMeasurement &= (kMeasurementCount - 1);  // fast mod
+        SkASSERT(fCurrentMeasurement < kMeasurementCount);
+    }
 
     fAnimTimer.updateTime();
     if (fSlides[fCurrentSlide]->animate(fAnimTimer) || fDisplayStats) {
         fWindow->inval();
     }
 }