Revert of Revert of ozone: gpu: Add plumbing for platform-specific gpu messaging

content/gpu/gpu_child_thread.cc

Index: content/gpu/gpu_child_thread.cc
diff --git a/content/gpu/gpu_child_thread.cc b/content/gpu/gpu_child_thread.cc
index 74864cbd35062f711a54fdf7adeb45f8e7d78f32..ab0636da76fc4b4ce5e90c020aa7b8aa5a770aa9 100644
--- a/content/gpu/gpu_child_thread.cc
+++ b/content/gpu/gpu_child_thread.cc
@@ -19,6 +19,11 @@
 #include "ipc/ipc_sync_message_filter.h"
 #include "ui/gl/gl_implementation.h"
 
+#if defined(USE_OZONE)
+#include "ui/ozone/ozone_platform.h"
+#include "ui/ozone/public/gpu_platform_support.h"
+#endif
+
 namespace content {
 namespace {
 
@@ -113,6 +118,13 @@ bool GpuChildThread::OnControlMessageReceived(const IPC::Message& msg) {
   if (handled)
     return true;
 
+#if defined(USE_OZONE)
+  if (ui::OzonePlatform::GetInstance()
+          ->GetGpuPlatformSupport()
+          ->OnMessageReceived(msg))
+    return true;
+#endif
+
   return gpu_channel_manager_.get() &&
       gpu_channel_manager_->OnMessageReceived(msg);
 }
@@ -152,6 +164,12 @@ void GpuChildThread::OnInitialize() {
                             watchdog_thread_.get(),
                             ChildProcess::current()->io_message_loop_proxy(),
                             ChildProcess::current()->GetShutDownEvent()));
+
+#if defined(USE_OZONE)
+  ui::OzonePlatform::GetInstance()
+      ->GetGpuPlatformSupport()
+      ->OnChannelEstablished(this);
+#endif
 }
 
 void GpuChildThread::StopWatchdog() {