Revert 132218 - Convert plugin and GPU process to brokered handle duplication.

content/common/gpu/gpu_channel.cc

Index: content/common/gpu/gpu_channel.cc
===================================================================
--- content/common/gpu/gpu_channel.cc	(revision 132251)
+++ content/common/gpu/gpu_channel.cc	(working copy)
@@ -40,6 +40,8 @@
                        bool software)
     : gpu_channel_manager_(gpu_channel_manager),
       client_id_(client_id),
+      renderer_process_(base::kNullProcessHandle),
+      renderer_pid_(base::kNullProcessId),
       share_group_(share_group ? share_group : new gfx::GLShareGroup),
       watchdog_(watchdog),
       software_(software),
@@ -60,6 +62,10 @@
 }
 
 GpuChannel::~GpuChannel() {
+#if defined(OS_WIN)
+  if (renderer_process_)
+    CloseHandle(renderer_process_);
+#endif
 }
 
 bool GpuChannel::OnMessageReceived(const IPC::Message& message) {
@@ -107,6 +113,10 @@
   gpu_channel_manager_->RemoveChannel(client_id_);
 }
 
+void GpuChannel::OnChannelConnected(int32 peer_pid) {
+  renderer_pid_ = peer_pid;
+}
+
 bool GpuChannel::Send(IPC::Message* message) {
   // The GPU process must never send a synchronous IPC message to the renderer
   // process. This could result in deadlock.
@@ -201,6 +211,7 @@
   // here. This is so the reply can be delayed if the scheduler is unscheduled.
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(GpuChannel, msg)
+    IPC_MESSAGE_HANDLER(GpuChannelMsg_Initialize, OnInitialize)
     IPC_MESSAGE_HANDLER_DELAY_REPLY(GpuChannelMsg_CreateOffscreenCommandBuffer,
                                     OnCreateOffscreenCommandBuffer)
     IPC_MESSAGE_HANDLER_DELAY_REPLY(GpuChannelMsg_DestroyCommandBuffer,
@@ -301,6 +312,15 @@
   return num_contexts_preferring_discrete_gpu_ > 0;
 }
 
+void GpuChannel::OnInitialize(base::ProcessHandle renderer_process) {
+  // Initialize should only happen once.
+  DCHECK(!renderer_process_);
+
+  // Verify that the renderer has passed its own process handle.
+  if (base::GetProcId(renderer_process) == renderer_pid_)
+    renderer_process_ = renderer_process;
+}
+
 void GpuChannel::OnCreateOffscreenCommandBuffer(
     const gfx::Size& size,
     const GPUCreateCommandBufferConfig& init_params,