ozone: Add ability to set clinet capabilities which we will need for atomic

ui/ozone/platform/drm/gpu/drm_device.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/ozone/platform/drm/gpu/drm_device.h"
 
 #include <fcntl.h>
 #include <sys/mman.h>
 #include <unistd.h>
 #include <xf86drm.h>
@@ skipping 486 matching lines @@
     // If successful the payload will be removed by the event
     ignore_result(payload.release());
     return true;
   }
   return false;
 #else
   return false;
 #endif  // defined(USE_DRM_ATOMIC)
 }
 
+bool DrmDevice::SetCapability(uint64_t capability, uint64_t value) {
+  return !drmSetClientCap(file_.GetPlatformFile(), capability, value);

[dnicoara, 2015/04/24 19:38:55]

nit:DCHECK(file_.IsValid());

+}
+
 bool DrmDevice::SetMaster() {
   DCHECK(file_.IsValid());
   return (drmSetMaster(file_.GetPlatformFile()) == 0);
 }
 
 bool DrmDevice::DropMaster() {
   DCHECK(file_.IsValid());
   return (drmDropMaster(file_.GetPlatformFile()) == 0);
 }
 
 }  // namespace ui