Adding status to swap complete

content/common/gpu/image_transport_surface_mac.mm

Index: content/common/gpu/image_transport_surface_mac.mm
diff --git a/content/common/gpu/image_transport_surface_mac.mm b/content/common/gpu/image_transport_surface_mac.mm
index 7966d5ac71202b4217c0b07f9c870b5bfcdf9dc7..04b6bc3b4d542372e50fe1e7ce02749c4df7af03 100644
--- a/content/common/gpu/image_transport_surface_mac.mm
+++ b/content/common/gpu/image_transport_surface_mac.mm
@@ -28,15 +28,15 @@ class DRTSurfaceOSMesa : public gfx::GLSurfaceOSMesa {
       : GLSurfaceOSMesa(gfx::OSMesaSurfaceFormatRGBA, gfx::Size(1, 1)) {}
 
   // Implement a subset of GLSurface.
-  bool SwapBuffers() override;
+  gfx::SwapResult SwapBuffers() override;
 
  private:
   ~DRTSurfaceOSMesa() override {}
   DISALLOW_COPY_AND_ASSIGN(DRTSurfaceOSMesa);
 };
 
-bool DRTSurfaceOSMesa::SwapBuffers() {
-  return true;
+gfx::SwapResult DRTSurfaceOSMesa::SwapBuffers() {
+  return gfx::SwapResult::SWAP_ACK;
 }
 
 bool g_allow_os_mesa = false;