Refactor delegated scrolling in LayerImpl

content/browser/android/in_process/synchronous_compositor_impl.cc

 // Copyright 2013 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/android/in_process/synchronous_compositor_impl.h"
 
 #include "base/auto_reset.h"
 #include "base/bind.h"
 #include "base/lazy_instance.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 56 matching lines @@
 }
 
 SynchronousCompositorImpl::SynchronousCompositorImpl(WebContents* contents)
     : compositor_client_(NULL),
       output_surface_(NULL),
       begin_frame_source_(nullptr),
       contents_(contents),
       routing_id_(contents->GetRoutingID()),
       input_handler_(NULL),
       invoking_composite_(false),
+      block_updates_(false),
       weak_ptr_factory_(this) {
   DCHECK(contents);
   DCHECK_NE(routing_id_, MSG_ROUTING_NONE);
   SynchronousCompositorRegistry::GetInstance()->RegisterCompositor(routing_id_,
                                                                    this);
 }
 
 SynchronousCompositorImpl::~SynchronousCompositorImpl() {
   SynchronousCompositorRegistry::GetInstance()->UnregisterCompositor(
       routing_id_, this);
@@ skipping 238 matching lines @@
   return gfx::ScrollOffset();
 }
 
 bool SynchronousCompositorImpl::IsExternalFlingActive() const {
   DCHECK(CalledOnValidThread());
   if (compositor_client_)
     return compositor_client_->IsExternalFlingActive();
   return false;
 }
 
+void SynchronousCompositorImpl::SetBlockUpdates(bool block_updates) {
+  block_updates_ = block_updates;
+}
+
 void SynchronousCompositorImpl::UpdateRootLayerState(
     const gfx::ScrollOffset& total_scroll_offset,
     const gfx::ScrollOffset& max_scroll_offset,
     const gfx::SizeF& scrollable_size,
     float page_scale_factor,
     float min_page_scale_factor,
     float max_page_scale_factor) {
   DCHECK(CalledOnValidThread());
   if (!compositor_client_)
     return;
@@ skipping 23 matching lines @@
     g_factory.Get();  // Ensure it's initialized.
     SynchronousCompositorImpl::CreateForWebContents(contents);
   }
   SynchronousCompositorImpl* instance =
       SynchronousCompositorImpl::FromWebContents(contents);
   DCHECK(instance);
   instance->SetClient(client);
 }
 
 }  // namespace content