Implement StreamTexture::BindTexImage.

content/common/gpu/client/gpu_channel_host.cc

Index: content/common/gpu/client/gpu_channel_host.cc
diff --git a/content/common/gpu/client/gpu_channel_host.cc b/content/common/gpu/client/gpu_channel_host.cc
index 237a1d31f10bef6786926618715d536cdcf73b9f..287f70249ad48e9e13c03373be0a8d16283aba59 100644
--- a/content/common/gpu/client/gpu_channel_host.cc
+++ b/content/common/gpu/client/gpu_channel_host.cc
@@ -61,7 +61,8 @@ GpuChannelHost::GpuChannelHost(
     gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager)
     : factory_(factory),
       gpu_info_(gpu_info),
-      gpu_memory_buffer_manager_(gpu_memory_buffer_manager) {
+      gpu_memory_buffer_manager_(gpu_memory_buffer_manager),
+      command_buffer_routing_id_(0) {
   next_transfer_buffer_id_.GetNext();
   next_image_id_.GetNext();
   next_route_id_.GetNext();
@@ -235,6 +236,7 @@ CommandBufferProxyImpl* GpuChannelHost::CreateOffscreenCommandBuffer(
   CommandBufferProxyImpl* command_buffer =
       new CommandBufferProxyImpl(this, route_id);
   AddRoute(route_id, command_buffer->AsWeakPtr());
+  command_buffer_routing_id_ = route_id;

[piman, 2015/06/30 23:04:20]

NAK. A channel has multiple command buffers, and they can be created from
multiple threads. This field doesn't make sense and is racy.

You definitely want to go via GpuControl, which is the CommandBufferProxyImpl,
that has the command buffer route id.

[sivag, 2015/07/16 14:24:58]

Done.

 
   AutoLock lock(context_lock_);
   proxies_[route_id] = command_buffer;
@@ -291,6 +293,7 @@ void GpuChannelHost::DestroyCommandBuffer(
 
   AutoLock lock(context_lock_);
   proxies_.erase(route_id);
+  command_buffer_routing_id_ = 0;
   if (flush_info_.flush_pending && flush_info_.route_id == route_id)
     flush_info_.flush_pending = false;
 
@@ -396,6 +399,18 @@ GpuChannelHost::~GpuChannelHost() {
 #endif
 }
 
+unsigned GpuChannelHost::CreateStreamTexture(int32 image_id) {
+  DCHECK(command_buffer_routing_id_);
+  int32 stream_id = GenerateRouteID();
+  bool succeeded = factory_->CreateStreamTexture(
+      image_id, command_buffer_routing_id_, stream_id);
+  if (!succeeded) {
+    DLOG(ERROR) << "GpuCommandBufferMsg_CreateStreamTexture returned failure";
+    return 0;
+  }
+  return stream_id;
+}
+
 GpuChannelHost::MessageFilter::MessageFilter()
     : lost_(false) {
 }