Enable custom order for searches.
Enable custom order for searches.

The /search interface used to always automatically choose an ordering. This CL
makes it possible to override the default ordering with an arbitrary properties,
assuming the relevant index exists.

R=rogerta@chromium.org
Review: https://codereview.appspot.com/6584061/

gavioto/rietveld,gco/rietveld,Koulio/rietveld,sajingeo/rietveld,ericmckean/rietveld,openlabs/cr.openlabs.co.in,Koulio/rietveld,xtypebee/rietveld,Koulio/rietveld,gco/rietveld,dushmis/rietveld,xtypebee/rietveld,salomon1184/rietveld,arg0/rietveld,openlabs/cr.openlabs.co.in,andyzsf/rietveld,gavioto/rietveld,foolonhill/rietveld,DeanHere/rietveld,google-code-export/rietveld,supriyantomaftuh/rietveld,supriyantomaftuh/rietveld,berkus/rietveld,supriyantomaftuh/rietveld,berkus/rietveld,aungzanbaw/rietveld,v3ss0n/rietveld,draem0507/rietveld,kscharding/integral-solutions-smxq,ericmckean/rietveld,berkus/rietveld,draem0507/rietveld,kscharding/integral-solutions-smxq,aungzanbaw/rietveld,rietveld-codereview/rietveld,aungzanbaw/rietveld,fuzan/rietveld,v3ss0n/rietveld,sajingeo/rietveld,xtypebee/rietveld,salomon1184/rietveld,arg0/rietveld,v3ss0n/rietveld,openlabs/cr.openlabs.co.in,rietveld-codereview/rietveld,andyzsf/rietveld,google-code-export/rietveld,DeanHere/rietveld,foolonhill/rietveld,ericmckean/rietveld,gavioto/rietveld,rietveld-codereview/rietveld,draem0507/rietveld,andyzsf/rietveld,salomon1184/rietveld,foolonhill/rietveld,dushmis/rietveld,dushmis/rietveld,kscharding/integral-solutions-smxq,robfig/rietveld,sajingeo/rietveld,robfig/rietveld,fuzan/rietveld,fuzan/rietveld,arg0/rietveld,DeanHere/rietveld,gco/rietveld,rietveld-codereview/rietveld,google-code-export/rietveld,robfig/rietveld