Change CaptureSynchronizer and PointerWatcherEventRouter to support multiple CaptureClients.

ui/views/mus/mus_client.cc

 // Copyright 2016 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 "ui/views/mus/mus_client.h"
 
 #include "base/bind.h"
 #include "base/memory/ptr_util.h"
 #include "base/threading/thread.h"
 #include "components/discardable_memory/client/client_discardable_shared_memory_manager.h"
 #include "services/service_manager/public/cpp/connection.h"
 #include "services/service_manager/public/cpp/connector.h"
 #include "services/ui/public/cpp/gpu/gpu.h"
 #include "services/ui/public/cpp/property_type_converters.h"
 #include "services/ui/public/interfaces/constants.mojom.h"
 #include "services/ui/public/interfaces/event_matcher.mojom.h"
 #include "services/ui/public/interfaces/window_manager.mojom.h"
 #include "ui/aura/env.h"
+#include "ui/aura/mus/capture_synchronizer.h"
 #include "ui/aura/mus/mus_context_factory.h"
 #include "ui/aura/mus/os_exchange_data_provider_mus.h"
 #include "ui/aura/mus/property_converter.h"
 #include "ui/aura/mus/window_tree_client.h"
 #include "ui/aura/mus/window_tree_host_mus.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_tree_host.h"
 #include "ui/views/mus/aura_init.h"
 #include "ui/views/mus/clipboard_mus.h"
 #include "ui/views/mus/desktop_window_tree_host_mus.h"
@@ skipping 186 matching lines @@
   } else {
     std::map<std::string, std::vector<uint8_t>> mus_properties =
         ConfigurePropertiesFromParams(init_params);
     native_widget->SetDesktopWindowTreeHost(
         base::MakeUnique<DesktopWindowTreeHostMus>(delegate, native_widget,
                                                    &mus_properties));
   }
   return native_widget;
 }
 
+void MusClient::OnCaptureClientSet(
+    aura::client::CaptureClient* capture_client) {
+  pointer_watcher_event_router_->AttachToCaptureClient(capture_client);
+  window_tree_client_->capture_synchronizer()->AttachToCaptureClient(
+      capture_client);
+}
+
+void MusClient::OnCaptureClientUnset(
+    aura::client::CaptureClient* capture_client) {
+  pointer_watcher_event_router_->DetachFromCaptureClient(capture_client);
+  window_tree_client_->capture_synchronizer()->DetachFromCaptureClient(
+      capture_client);
+}
+
 void MusClient::AddObserver(MusClientObserver* observer) {
   observer_list_.AddObserver(observer);
 }
 
 void MusClient::RemoveObserver(MusClientObserver* observer) {
   observer_list_.RemoveObserver(observer);
 }
 void MusClient::SetMusPropertyMirror(
     std::unique_ptr<MusPropertyMirror> mirror) {
   mus_property_mirror_ = std::move(mirror);
@@ skipping 42 matching lines @@
       return root->GetTopWindowContainingPoint(relative_point);
   }
   return nullptr;
 }
 
 std::unique_ptr<OSExchangeData::Provider> MusClient::BuildProvider() {
   return base::MakeUnique<aura::OSExchangeDataProviderMus>();
 }
 
 }  // namespace views