Update Context Client Visibility to use Scoped Pattern

cc/output/gl_renderer.h

Index: cc/output/gl_renderer.h
diff --git a/cc/output/gl_renderer.h b/cc/output/gl_renderer.h
index b26f868459537bd8596cbbd27b37ee3350c86e36..00cd5dbd16865183240f124c1d44ac3ddadd218b 100644
--- a/cc/output/gl_renderer.h
+++ b/cc/output/gl_renderer.h
@@ -21,6 +21,7 @@
 #include "cc/quads/solid_color_draw_quad.h"
 #include "cc/quads/tile_draw_quad.h"
 #include "cc/quads/yuv_video_draw_quad.h"
+#include "gpu/command_buffer/client/context_support.h"
 #include "ui/gfx/geometry/quad_f.h"
 
 class SkBitmap;
@@ -544,6 +545,9 @@ class CC_EXPORT GLRenderer : public DirectRenderer {
 
   BoundGeometry bound_geometry_;
   ColorLUTCache color_lut_cache_;
+
+  std::unique_ptr<gpu::ContextSupport::ScopedVisibility>
+      context_client_visibility_;
   DISALLOW_COPY_AND_ASSIGN(GLRenderer);
 };