Shrink texture uploader when not visible.

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 178 matching lines @@
 void TextureUploader::flush() {
   if (!m_numTextureUploadsSinceLastFlush)
     return;
 
   if (m_useShallowFlush)
     m_context->shallowFlushCHROMIUM();
 
   m_numTextureUploadsSinceLastFlush = 0;
 }
 
+void TextureUploader::releaseCachedQueries()
+{
+  processQueries();
+  m_availableQueries.clear();
+}
+
 void TextureUploader::uploadWithTexSubImage(const uint8* image,
                                             const gfx::Rect& image_rect,
                                             const gfx::Rect& source_rect,
                                             const gfx::Vector2d& dest_offset,
                                             GLenum format)
 {
     // Instrumentation to debug issue 156107
     int source_rect_x = source_rect.x();
     int source_rect_y = source_rect.y();
     int source_rect_width = source_rect.width();
@@ skipping 155 matching lines @@
             m_texturesPerSecondHistory.erase(m_texturesPerSecondHistory.begin());
             m_texturesPerSecondHistory.erase(--m_texturesPerSecondHistory.end());
         }
         m_texturesPerSecondHistory.insert(texturesPerSecond);
 
         m_availableQueries.push_back(m_pendingQueries.take_front());
     }
 }
 
 }  // namespace cc