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

ui/ozone/platform/dri/gpu_platform_support_host_gbm.cc

Index: ui/ozone/platform/dri/gpu_platform_support_host_gbm.cc
diff --git a/ui/ozone/platform/dri/gpu_platform_support_host_gbm.cc b/ui/ozone/platform/dri/gpu_platform_support_host_gbm.cc
index 39478bd427f5af0b2c3b5eba6be9e736997a64e2..4f0394aa5c9fb5f04275e00a11233555b8ec8ca7 100644
--- a/ui/ozone/platform/dri/gpu_platform_support_host_gbm.cc
+++ b/ui/ozone/platform/dri/gpu_platform_support_host_gbm.cc
@@ -4,6 +4,7 @@
 
 #include "ui/ozone/platform/dri/gpu_platform_support_host_gbm.h"
 
+#include "ui/ozone/common/gpu/ozone_gpu_message_params.h"
 #include "ui/ozone/common/gpu/ozone_gpu_messages.h"
 
 namespace ui {
@@ -12,10 +13,28 @@ GpuPlatformSupportHostGbm::GpuPlatformSupportHostGbm()
     : host_id_(-1), sender_(NULL) {
 }
 
+GpuPlatformSupportHostGbm::~GpuPlatformSupportHostGbm() {}
+
+void GpuPlatformSupportHostGbm::RegisterHandler(
+    GpuPlatformSupportHost* handler) {
+  handlers_.push_back(handler);
+}
+
+void GpuPlatformSupportHostGbm::UnregisterHandler(
+    GpuPlatformSupportHost* handler) {
+  std::vector<GpuPlatformSupportHost*>::iterator it =
+      std::find(handlers_.begin(), handlers_.end(), handler);
+  if (it != handlers_.end())
+    handlers_.erase(it);
+}
+
 void GpuPlatformSupportHostGbm::OnChannelEstablished(int host_id,
                                                      IPC::Sender* sender) {
   host_id_ = host_id;
   sender_ = sender;
+
+  for (size_t i = 0; i < handlers_.size(); ++i)
+    handlers_[i]->OnChannelEstablished(host_id, sender);
 }
 
 void GpuPlatformSupportHostGbm::OnChannelDestroyed(int host_id) {
@@ -23,9 +42,23 @@ void GpuPlatformSupportHostGbm::OnChannelDestroyed(int host_id) {
     host_id_ = -1;
     sender_ = NULL;
   }
+
+  for (size_t i = 0; i < handlers_.size(); ++i)
+    handlers_[i]->OnChannelDestroyed(host_id);
 }
 
 bool GpuPlatformSupportHostGbm::OnMessageReceived(const IPC::Message& message) {
+  for (size_t i = 0; i < handlers_.size(); ++i)
+    if (handlers_[i]->OnMessageReceived(message))
+      return true;
+
+  return false;
+}
+
+bool GpuPlatformSupportHostGbm::Send(IPC::Message* message) {
+  if (sender_)
+    return sender_->Send(message);
+
   return false;
 }