Run VDA::Decode on GPU IO thread if VDA supports it.

content/common/gpu/gpu_channel.cc

Index: content/common/gpu/gpu_channel.cc
diff --git a/content/common/gpu/gpu_channel.cc b/content/common/gpu/gpu_channel.cc
index 2b920d3a0704dfeffefb4c62887227867abed977..30788877cccaa01d1b826ed1bc652439035e45f2 100644
--- a/content/common/gpu/gpu_channel.cc
+++ b/content/common/gpu/gpu_channel.cc
@@ -985,4 +985,12 @@ void GpuChannel::CacheShader(const std::string& key,
       new GpuHostMsg_CacheShader(client_id_, key, shader));
 }
 
+void GpuChannel::AddFilter(IPC::ChannelProxy::MessageFilter* filter) {
+  channel_->AddFilter(filter);
+}
+
+void GpuChannel::RemoveFilter(IPC::ChannelProxy::MessageFilter* filter) {
+  channel_->RemoveFilter(filter);
+}
+
 }  // namespace content