Renamed ChannelObserver to better describe its purpose

ui/ozone/platform/drm/host/drm_window_host.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/drm/host/drm_window_host.h"
 
 #include "base/bind.h"
 #include "ui/events/devices/device_data_manager.h"
 #include "ui/events/event.h"
 #include "ui/events/ozone/evdev/event_factory_evdev.h"
@@ skipping 29 matching lines @@
       bounds_(bounds),
       widget_(window_manager->NextAcceleratedWidget()) {
   window_manager_->AddWindow(widget_, this);
 }
 
 DrmWindowHost::~DrmWindowHost() {
   PlatformEventSource::GetInstance()->RemovePlatformEventDispatcher(this);
   window_manager_->RemoveWindow(widget_);
   cursor_->OnWindowRemoved(widget_);
 
-  sender_->RemoveChannelObserver(this);
+  sender_->RemoveGpuThreadObserver(this);
   sender_->Send(new OzoneGpuMsg_DestroyWindow(widget_));
 }
 
 void DrmWindowHost::Initialize() {
-  sender_->AddChannelObserver(this);
+  sender_->AddGpuThreadObserver(this);
   PlatformEventSource::GetInstance()->AddPlatformEventDispatcher(this);
   cursor_->OnWindowAdded(widget_, bounds_, GetCursorConfinedBounds());
   delegate_->OnAcceleratedWidgetAvailable(widget_, 1.f);
 }
 
 gfx::AcceleratedWidget DrmWindowHost::GetAcceleratedWidget() {
   return widget_;
 }
 
 gfx::Rect DrmWindowHost::GetCursorConfinedBounds() const {
@@ skipping 115 matching lines @@
     location -= gfx::Vector2dF(bounds_.OffsetFromOrigin());
     located_event->set_location_f(location);
     located_event->set_root_location_f(location);
   }
   DispatchEventFromNativeUiEvent(
       native_event, base::Bind(&PlatformWindowDelegate::DispatchEvent,
                                base::Unretained(delegate_)));
   return POST_DISPATCH_STOP_PROPAGATION;
 }
 
-void DrmWindowHost::OnChannelEstablished() {
+void DrmWindowHost::OnGpuThreadReady() {
   sender_->Send(new OzoneGpuMsg_CreateWindow(widget_));
   SendBoundsChange();
 }
 
-void DrmWindowHost::OnChannelDestroyed() {
-}
+void DrmWindowHost::OnGpuThreadRetired() {}
 
 void DrmWindowHost::SendBoundsChange() {
   // Update the cursor before the window so that the cursor stays within the
   // window bounds when the window size shrinks.
   cursor_->CommitBoundsChange(widget_, bounds_, GetCursorConfinedBounds());
   sender_->Send(new OzoneGpuMsg_WindowBoundsChanged(widget_, bounds_));
 
   overlay_manager_->ResetCache();
 }
 
 }  // namespace ui