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

content/browser/compositor/browser_compositor_output_surface.cc

 // Copyright 2014 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/browser_compositor_output_surface.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 42 matching lines @@
 
 BrowserCompositorOutputSurface::~BrowserCompositorOutputSurface() {
   if (reflector_)
     reflector_->DetachFromOutputSurface();
   DCHECK(!reflector_);
 }
 
 void BrowserCompositorOutputSurface::OnUpdateVSyncParametersFromGpu(
     base::TimeTicks timebase,
     base::TimeDelta interval) {
-  DCHECK(client_);  // BindToClient should have been called already.
-
   if (interval.is_zero()) {
     // TODO(brianderson): We should not be receiving 0 intervals.
     interval = cc::BeginFrameArgs::DefaultInterval();
   }
   synthetic_begin_frame_source_->OnUpdateVSyncParameters(timebase, interval);
   vsync_manager_->UpdateVSyncParameters(timebase, interval);
 }
 
 void BrowserCompositorOutputSurface::SetReflector(ReflectorImpl* reflector) {
   // Software mirroring is done by doing a GL copy out of the framebuffer - if
@@ skipping 14 matching lines @@
   return overlay_candidate_validator_.get();
 }
 
 bool BrowserCompositorOutputSurface::HasExternalStencilTest() const {
   return false;
 }
 
 void BrowserCompositorOutputSurface::ApplyExternalStencil() {}
 
 }  // namespace content