[Ozone-GBM] Add basic support for display configuration over IPC

ui/ozone/platform/dri/chromeos/native_display_delegate_dri.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 "ui/ozone/platform/dri/chromeos/native_display_delegate_dri.h"
 
 #include "base/bind.h"
 #include "third_party/skia/include/core/SkCanvas.h"
 #include "ui/display/types/chromeos/native_display_observer.h"
 #include "ui/events/ozone/device/device_event.h"
@@ skipping 14 matching lines @@
 NativeDisplayDelegateDri::NativeDisplayDelegateDri(
     DriWrapper* dri,
     ScreenManager* screen_manager,
     DeviceManager* device_manager)
     : dri_(dri),
       screen_manager_(screen_manager),
       device_manager_(device_manager) {
 }
 
 NativeDisplayDelegateDri::~NativeDisplayDelegateDri() {
-  device_manager_->RemoveObserver(this);
+  if (device_manager_)
+    device_manager_->RemoveObserver(this);
+}
+
+DisplaySnapshot* NativeDisplayDelegateDri::FindDisplaySnapshot(int64_t id) {
+  for (size_t i = 0; i < cached_displays_.size(); ++i)
+    if (cached_displays_[i]->display_id() == id)
+      return cached_displays_[i];
+
+  return NULL;
 }
 
 void NativeDisplayDelegateDri::Initialize() {
-  device_manager_->AddObserver(this);
+  if (device_manager_)
+    device_manager_->AddObserver(this);
 
   ScopedVector<HardwareDisplayControllerInfo> displays =
       GetAvailableDisplayControllerInfos(dri_->get_fd());
 
   // By default all displays show the same console buffer.
   console_buffer_.reset(
       new DriConsoleBuffer(dri_, displays[0]->crtc()->buffer_id));
   if (!console_buffer_->Initialize()) {
     VLOG(1) << "Failed to initialize console buffer";
     console_buffer_.reset();
@@ skipping 147 matching lines @@
       }
     }
 
     if (!found)
       screen_manager_->RemoveDisplayController(old_displays[i]->crtc(),
                                                old_displays[i]->connector());
   }
 }
 
 }  // namespace ui