Renamed ChannelObserver to better describe its purpose

ui/ozone/platform/drm/host/drm_display_host.cc

 // Copyright 2015 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_display_host.h"
 
 #include "base/thread_task_runner_handle.h"
 #include "ui/ozone/common/display_snapshot_proxy.h"
 #include "ui/ozone/common/display_util.h"
 #include "ui/ozone/common/gpu/ozone_gpu_messages.h"
 #include "ui/ozone/platform/drm/host/drm_gpu_platform_support_host.h"
 
 namespace ui {
 
 DrmDisplayHost::DrmDisplayHost(DrmGpuPlatformSupportHost* sender,
                                const DisplaySnapshot_Params& params,
                                bool is_dummy)
     : sender_(sender),
       snapshot_(new DisplaySnapshotProxy(params)),
       is_dummy_(is_dummy) {
-  sender_->AddChannelObserver(this);
+  sender_->AddGpuThreadObserver(this);
 }
 
 DrmDisplayHost::~DrmDisplayHost() {
-  sender_->RemoveChannelObserver(this);
+  sender_->RemoveGpuThreadObserver(this);
   ClearCallbacks();
 }
 
 void DrmDisplayHost::UpdateDisplaySnapshot(
     const DisplaySnapshot_Params& params) {
   snapshot_ = make_scoped_ptr(new DisplaySnapshotProxy(params));
 }
 
 void DrmDisplayHost::Configure(const DisplayMode* mode,
                                const gfx::Point& origin,
@@ skipping 64 matching lines @@
                << snapshot_->display_id();
   }
 
   set_hdcp_callback_.Reset();
 }
 
 void DrmDisplayHost::SetGammaRamp(const std::vector<GammaRampRGBEntry>& lut) {
   sender_->Send(new OzoneGpuMsg_SetGammaRamp(snapshot_->display_id(), lut));
 }
 
-void DrmDisplayHost::OnChannelEstablished() {
+void DrmDisplayHost::OnGpuThreadReady() {
   is_dummy_ = false;
 
   // Note: These responses are done here since the OnChannelDestroyed() is
   // called after OnChannelEstablished().
   ClearCallbacks();
 }
 
-void DrmDisplayHost::OnChannelDestroyed() {
-}
+void DrmDisplayHost::OnGpuThreadRetired() {}
 
 void DrmDisplayHost::ClearCallbacks() {
   if (!configure_callback_.is_null())
     OnDisplayConfigured(false);
   if (!get_hdcp_callback_.is_null())
     OnHDCPStateReceived(false, HDCP_STATE_UNDESIRED);
   if (!set_hdcp_callback_.is_null())
     OnHDCPStateUpdated(false);
 }
 
 }  // namespace ui