ozone: gbm: Add overlay support

ui/ozone/platform/dri/test/mock_dri_wrapper.cc

Index: ui/ozone/platform/dri/test/mock_dri_wrapper.cc
diff --git a/ui/ozone/platform/dri/test/mock_dri_wrapper.cc b/ui/ozone/platform/dri/test/mock_dri_wrapper.cc
index 8b41b175d4a0896928cd495c713aab2e5a71cf15..5063c2f805b83b1c00a2e37e333924590e28edb3 100644
--- a/ui/ozone/platform/dri/test/mock_dri_wrapper.cc
+++ b/ui/ozone/platform/dri/test/mock_dri_wrapper.cc
@@ -27,6 +27,7 @@ MockDriWrapper::MockDriWrapper(int fd)
       add_framebuffer_call_count_(0),
       remove_framebuffer_call_count_(0),
       page_flip_call_count_(0),
+      overlay_flip_call_count_(0),
       set_crtc_expectation_(true),
       add_framebuffer_expectation_(true),
       page_flip_expectation_(true) {
@@ -79,6 +80,15 @@ bool MockDriWrapper::PageFlip(uint32_t crtc_id,
   return page_flip_expectation_;
 }
 
+bool MockDriWrapper::PageFlipOverlay(uint32_t crtc_id,
+                                     uint32_t framebuffer,
+                                     const gfx::Rect& location,
+                                     const gfx::RectF& source,
+                                     int overlay_plane) {
+  overlay_flip_call_count_++;
+  return true;
+}
+
 ScopedDrmPropertyPtr MockDriWrapper::GetProperty(drmModeConnector* connector,
                                                  const char* name) {
   return ScopedDrmPropertyPtr(DrmAllocator<drmModePropertyRes>());