Mac Overlays: Plumb through GL solid color overlay support

content/common/gpu/image_transport_surface_overlay_mac.h

Index: content/common/gpu/image_transport_surface_overlay_mac.h
diff --git a/content/common/gpu/image_transport_surface_overlay_mac.h b/content/common/gpu/image_transport_surface_overlay_mac.h
index e50c9d058a82d08d98d133f38ebd54dda38f8687..20fe730e9229deace825a09b238a24677bcf7271 100644
--- a/content/common/gpu/image_transport_surface_overlay_mac.h
+++ b/content/common/gpu/image_transport_surface_overlay_mac.h
@@ -45,6 +45,12 @@ class ImageTransportSurfaceOverlayMac : public gfx::GLSurface,
                             gfx::GLImage* image,
                             const gfx::Rect& bounds_rect,
                             const gfx::RectF& crop_rect) override;
+  bool ScheduleSolidColorOverlayPlane(int z_order,
+                                      const gfx::Rect& bounds_rect,
+                                      float red,
+                                      float green,
+                                      float blue,
+                                      float alpha) override;
   bool IsSurfaceless() const override;
 
   // ImageTransportSurface implementation