Clamp texture queries to sane values.

cc/texture_uploader.cc

Index: cc/texture_uploader.cc
diff --git a/cc/texture_uploader.cc b/cc/texture_uploader.cc
index f25764bb837cc795937927cc412b1e8179b6ff4e..4294db88334a7903a402894c26d11b71ea0805a0 100644
--- a/cc/texture_uploader.cc
+++ b/cc/texture_uploader.cc
@@ -353,6 +353,10 @@ void TextureUploader::processQueries()
         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(5000u, usElapsed);

[reveman, 2012/12/04 21:24:09]

you might want to make the limit a bit higher. like 15000u. 3 textures per frame
is not far from the real upload performance on some android devices. also there
shouldn't be any problem with making this too high as the
ResourceUpdateController will make sure do perform at least one update per
frame.

+
         if (!m_pendingQueries.first()->isNonBlocking())
             m_numBlockingTextureUploads--;