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minigbm doesn't allow to pass no flags to gbm_bo_create(). GBM_BO_USE_TEXTURING
implies texture, so use GBM_BO_USE_TEXTURING to create texture buffer.

GBM_BO_USE_TEXTURING implies GPU_READ. GBM_BO_USE_RENDERING implies GPU_WRITE.
BufferUsage::SCANOUT needs both of them because it implies GPU_READ_WRITE.

TEST=run chrome on amd64-generic
BUG=683347

Change-Id: I7431be6f5b4a8d95e6be11d86cfbf0c14b919668
Reviewed-on: https://chromium-review.googlesource.com/549095Reviewed-by: Daniel Nicoara <dnicoara@chromium.org>
Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Reviewed-by: David Reveman <reveman@chromium.org>
Reviewed-by: Stéphane Marchesin <marcheu@chromium.org>
Reviewed-by: Dongseong Hwang <dongseong.hwang@intel.com>
Commit-Queue: Dongseong Hwang <dongseong.hwang@intel.com>
Cr-Commit-Position: refs/heads/master@{#488709}