ozone: gbm: Add overlay support

ui/ozone/platform/dri/hardware_display_controller.h

Index: ui/ozone/platform/dri/hardware_display_controller.h
diff --git a/ui/ozone/platform/dri/hardware_display_controller.h b/ui/ozone/platform/dri/hardware_display_controller.h
index 472dbd6696de6f7c6303a704780e0e6c89c0c3ab..8d4d26bce1097ad376bfb43a3e62e99319974e9f 100644
--- a/ui/ozone/platform/dri/hardware_display_controller.h
+++ b/ui/ozone/platform/dri/hardware_display_controller.h
@@ -21,8 +21,30 @@ class Point;
 
 namespace ui {
 
+class NativePixmap;
 class ScanoutSurface;
 
+struct OzoneOverlayPlane {
+  OzoneOverlayPlane(ScanoutSurface* scanout,
+                    int z_order,
+                    gfx::OverlayTransform plane_transform,
+                    const gfx::Rect& display_bounds,
+                    const gfx::RectF& crop_rect)
+      : scanout(scanout),
+        z_order(z_order),
+        plane_transform(plane_transform),
+        display_bounds(display_bounds),
+        crop_rect(crop_rect),
+        overlay_plane(0) {}
+
+  ScanoutSurface* scanout;
+  int z_order;
+  gfx::OverlayTransform plane_transform;
+  gfx::Rect display_bounds;
+  gfx::RectF crop_rect;
+  int overlay_plane;
+};
+
 // The HDCOz will handle modesettings and scannout operations for hardware
 // devices.
 //
@@ -114,7 +136,8 @@ class HardwareDisplayController
   // called again before the page flip occurrs.
   //
   // Returns true if the page flip was successfully registered, false otherwise.
-  bool SchedulePageFlip();
+  bool SchedulePageFlip(std::vector<OzoneOverlayPlane>* overlays,
+                        std::vector<scoped_refptr<NativePixmap> >* references);
 
   // TODO(dnicoara) This should be on the MessageLoop when Ozone can have
   // BeginFrame can be triggered explicitly by Ozone.
@@ -150,6 +173,12 @@ class HardwareDisplayController
   };
 
  private:
+  // Assign overlay IDs to each overlay in the list, returning the primary
+  // plane's surface (z-index 0, or surface_.get()).
+  ScanoutSurface* AssignOverlayPlanes(std::vector<OzoneOverlayPlane>* overlays);
+
+  std::vector<scoped_refptr<NativePixmap> > current_overlay_references_;
+
   // Object containing the connection to the graphics device and wraps the API
   // calls to control it.
   DriWrapper* drm_;