Clamp texture queries to sane values.

cc/texture_uploader.cc

 // Copyright 2012 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.
 
 #include "cc/texture_uploader.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "base/debug/alias.h"
@@ skipping 335 matching lines @@
 
 void TextureUploader::processQueries()
 {
     while (!m_pendingQueries.isEmpty()) {
         if (m_pendingQueries.first()->isPending())
             break;
 
         unsigned usElapsed = m_pendingQueries.first()->value();
         HISTOGRAM_CUSTOM_COUNTS("Renderer4.TextureGpuUploadTimeUS", usElapsed, 0, 100000, 50);
 
+        // Clamp the queries to saner values in case the queries fail.
+        usElapsed = std::max(1u, usElapsed);
+        usElapsed = std::min(15000u, usElapsed);
+
         if (!m_pendingQueries.first()->isNonBlocking())
             m_numBlockingTextureUploads--;
 
         // Remove the min and max value from our history and insert the new one.
         double texturesPerSecond = 1.0 / (usElapsed * 1e-6);
         if (m_texturesPerSecondHistory.size() >= uploadHistorySizeMax) {
             m_texturesPerSecondHistory.erase(m_texturesPerSecondHistory.begin());
             m_texturesPerSecondHistory.erase(--m_texturesPerSecondHistory.end());
         }
         m_texturesPerSecondHistory.insert(texturesPerSecond);
 
         m_availableQueries.append(m_pendingQueries.takeFirst());
     }
 }
 
 }  // namespace cc