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

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

Index: ui/ozone/platform/drm/test/mock_drm_device.h
diff --git a/ui/ozone/platform/drm/test/mock_drm_device.h b/ui/ozone/platform/drm/test/mock_drm_device.h
index cd9a2f225cf621a85f980b94a5866ff0872779c9..ec29cf5370e94d6062d4f5702cfcafae07c63531 100644
--- a/ui/ozone/platform/drm/test/mock_drm_device.h
+++ b/ui/ozone/platform/drm/test/mock_drm_device.h
@@ -111,6 +111,7 @@ class MockDrmDevice : public ui::DrmDevice {
                         const PageFlipCallback& callback) override;
   bool SetGammaRamp(uint32_t crtc_id,
                     const std::vector<GammaRampRGBEntry>& lut) override;
+  bool SetCapability(uint64_t capability, uint64_t value) override;
 
  private:
   ~MockDrmDevice() override;