June 28 (Reuters) - Futures tracking Canada's resources-heavy main stock index edged higher on Wednesday as oil prices gained, while markets awaited remarks from major global central bankers later in the day. .N Oil prices rallied on Wednesday after an industry report of a larger-than-expected drop in U.S. crude inventories suggested robust demand and helped offset worries over further interest rate hikes. The Toronto Stock Exchange's S&P/TSX composite index .GSPTSE closed higher in the previous session, with technology and consumer discretionary leading the gains after data showed Canadian annual inflation eased.