Fix unbounded allocation of GL queries

cc/resources/texture_uploader.cc

Index: cc/resources/texture_uploader.cc
diff --git a/cc/resources/texture_uploader.cc b/cc/resources/texture_uploader.cc
index eb4e6c097a43b0f4257318a2a1f90386e264c030..8c7010b5f487fee7db3ef466b5a940a180fca2b4 100644
--- a/cc/resources/texture_uploader.cc
+++ b/cc/resources/texture_uploader.cc
@@ -116,6 +116,12 @@ double TextureUploader::EstimatedTexturesPerSecond() {
 }
 
 void TextureUploader::BeginQuery() {
+  // Check to see if any of the pending queries are free before allocating a
+  // new one. If this is not done, queries may be allocated without bound.
+  // http://crbug.com/398072
+  if (available_queries_.empty())
+    ProcessQueries();
+
   if (available_queries_.empty())
     available_queries_.push_back(Query::Create(gl_));