Preliminary atomic patch

ui/ozone/platform/drm/test/mock_drm_device.cc

Index: ui/ozone/platform/drm/test/mock_drm_device.cc
diff --git a/ui/ozone/platform/drm/test/mock_drm_device.cc b/ui/ozone/platform/drm/test/mock_drm_device.cc
index 851e760f270edab353150f34fd4bb7a7f6486aa6..984089f837dcdd95d1db6560183e41b1739c3ce4 100644
--- a/ui/ozone/platform/drm/test/mock_drm_device.cc
+++ b/ui/ozone/platform/drm/test/mock_drm_device.cc
@@ -214,6 +214,12 @@ void MockDrmDevice::DestroyDumbBuffer(const SkImageInfo& info,
   delete[] static_cast<char*>(pixels);
 }
 
+bool MockDrmDevice::CommitProperties(drmModePropertySet* properties,
+                                     uint32_t flags,
+                                     const PageFlipCallback& callback) {
+  return false;
+}
+
 void MockDrmDevice::RunCallbacks() {
   while (!callbacks_.empty()) {
     PageFlipCallback callback = callbacks_.front();