Reduce SurfaceIdAllocator usage and tie SurfaceFactory to a single FrameSinkId

content/browser/renderer_host/browser_compositor_view_mac.mm

 // 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/renderer_host/browser_compositor_view_mac.h"
 
 #include <stdint.h>
 
 #include <utility>
 
@@ skipping 156 matching lines @@
     ui::AcceleratedWidgetMacNSView* accelerated_widget_mac_ns_view,
     BrowserCompositorMacClient* client,
     bool render_widget_host_is_hidden,
     bool ns_view_attached_to_window)
     : client_(client),
       accelerated_widget_mac_ns_view_(accelerated_widget_mac_ns_view),
       weak_factory_(this) {
   g_browser_compositor_count += 1;
 
   root_layer_.reset(new ui::Layer(ui::LAYER_SOLID_COLOR));
-  delegated_frame_host_.reset(new DelegatedFrameHost(this));
+  ImageTransportFactory* factory = ImageTransportFactory::GetInstance();
+  delegated_frame_host_.reset(new DelegatedFrameHost(
+      factory->GetContextFactory()->AllocateFrameSinkId(), this));
 
   SetRenderWidgetHostIsHidden(render_widget_host_is_hidden);
   SetNSViewAttachedToWindow(ns_view_attached_to_window);
 }
 
 BrowserCompositorMac::~BrowserCompositorMac() {
   // Ensure that copy callbacks completed or cancelled during further tear-down
   // do not call back into this.
   weak_factory_.InvalidateWeakPtrs();
 
@@ skipping 282 matching lines @@
 
 const cc::BeginFrameArgs& BrowserCompositorMac::LastUsedBeginFrameArgs() const {
   return last_begin_frame_args_;
 }
 
 void BrowserCompositorMac::OnBeginFrameSourcePausedChanged(bool paused) {
   // Only used on Android WebView.
 }
 
 }  // namespace content