Fixed tough texture upload benchmark on low end devices.

gpu/command_buffer/client/gles2_implementation.h

Index: gpu/command_buffer/client/gles2_implementation.h
diff --git a/gpu/command_buffer/client/gles2_implementation.h b/gpu/command_buffer/client/gles2_implementation.h
index 7f036db908c6327eef9dc5b364a6a28353e5f7df..0805e4bc64bba1c7db38b9e08470e1beb02173bd 100644
--- a/gpu/command_buffer/client/gles2_implementation.h
+++ b/gpu/command_buffer/client/gles2_implementation.h
@@ -746,6 +746,12 @@ class GLES2_IMPL_EXPORT GLES2Implementation
   // Used to check for single threaded access.
   int use_count_;
 
+  // Maximum amount of extra memory from the mapped memory pool to use when
+  // needing to transfer something exceeding the default transfer buffer.
+  // This should be 0 for low memory devices since they are already memory
+  // constrained.
+  const uint32_t max_extra_transfer_buffer_size_;
+
   // Map of GLenum to Strings for glGetString.  We need to cache these because
   // the pointer passed back to the client has to remain valid for eternity.
   typedef std::map<uint32, std::set<std::string> > GLStringMap;