Update from https://crrev.com/317530

gpu/command_buffer/service/framebuffer_manager.h

Index: gpu/command_buffer/service/framebuffer_manager.h
diff --git a/gpu/command_buffer/service/framebuffer_manager.h b/gpu/command_buffer/service/framebuffer_manager.h
index 78c11ad2244cef39f87106fe82bceae84f56f7bf..75f7e2a7ec605d652e312720d06449cd372cb4cc 100644
--- a/gpu/command_buffer/service/framebuffer_manager.h
+++ b/gpu/command_buffer/service/framebuffer_manager.h
@@ -74,6 +74,11 @@ class GPU_EXPORT Framebuffer : public base::RefCounted<Framebuffer> {
     GLenum attachment,
     bool cleared);
 
+  // Unbinds all attachments from this framebuffer for workaround
+  // 'unbind_attachments_on_bound_render_fbo_delete'.  The Framebuffer must be
+  // bound when calling this.
+  void DoUnbindGLAttachmentsForWorkaround(GLenum target);
+
   // Attaches a renderbuffer to a particlar attachment.
   // Pass null to detach.
   void AttachRenderbuffer(