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..59f32b85bec68d93fc93a622d5669ee4fd7f5a84 100644
--- a/ui/ozone/platform/dri/hardware_display_controller.h
+++ b/ui/ozone/platform/dri/hardware_display_controller.h
@@ -21,8 +21,32 @@ class Point;
 
 namespace ui {
 
+class NativePixmap;
 class ScanoutSurface;
 
+typedef std::vector<scoped_refptr<NativePixmap> > NativePixmapList;
+
+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 +138,8 @@ class HardwareDisplayController
   // called again before the page flip occurrs.
   //
   // Returns true if the page flip was successfully registered, false otherwise.
-  bool SchedulePageFlip();
+  bool SchedulePageFlip(const std::vector<OzoneOverlayPlane>& overlays,
+                        NativePixmapList* references);
 
   // TODO(dnicoara) This should be on the MessageLoop when Ozone can have
   // BeginFrame can be triggered explicitly by Ozone.
@@ -150,6 +175,11 @@ class HardwareDisplayController
   };
 
  private:
+  ScanoutSurface* GetPrimaryPlane(
+      const std::vector<OzoneOverlayPlane>& overlays);
+
+  NativePixmapList current_overlay_references_;
+
   // Object containing the connection to the graphics device and wraps the API
   // calls to control it.
   DriWrapper* drm_;