cc: Make OutputSurface::BindToClient pure virtual and not return bool

content/browser/compositor/offscreen_browser_compositor_output_surface.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/compositor/offscreen_browser_compositor_output_surface.h"
 
 #include <utility>
 
 #include "base/logging.h"
 #include "build/build_config.h"
@@ skipping 29 matching lines @@
                                      std::move(overlay_candidate_validator)),
       weak_ptr_factory_(this) {
   capabilities_.uses_default_gl_framebuffer = false;
 }
 
 OffscreenBrowserCompositorOutputSurface::
     ~OffscreenBrowserCompositorOutputSurface() {
   DiscardBackbuffer();
 }
 
+void OffscreenBrowserCompositorOutputSurface::BindToClient(
+    cc::OutputSurfaceClient* client) {
+  DCHECK(client);
+  DCHECK(!client_);
+  client_ = client;
+}
+
 void OffscreenBrowserCompositorOutputSurface::EnsureBackbuffer() {
   bool update_source_texture = !reflector_texture_ || reflector_changed_;
   reflector_changed_ = false;
   if (!reflector_texture_) {
     reflector_texture_.reset(new ReflectorTexture(context_provider()));
 
     GLES2Interface* gl = context_provider_->ContextGL();
 
     const int max_texture_size =
         context_provider_->ContextCapabilities().max_texture_size;
@@ skipping 118 matching lines @@
     reflector_changed_ = true;
     EnsureBackbuffer();
   }
 }
 
 void OffscreenBrowserCompositorOutputSurface::OnSwapBuffersComplete() {
   client_->DidReceiveSwapBuffersAck();
 }
 
 }  // namespace content