Add subscribeUniform extension pipeline

gpu/command_buffer/service/context_group.cc

Index: gpu/command_buffer/service/context_group.cc
diff --git a/gpu/command_buffer/service/context_group.cc b/gpu/command_buffer/service/context_group.cc
index 00e7ec38b9efc1ca7be8ef29b0229e8b5db219be..6ee57e4c0d2636062f3f51ccbd083e521fe595a0 100644
--- a/gpu/command_buffer/service/context_group.cc
+++ b/gpu/command_buffer/service/context_group.cc
@@ -21,6 +21,7 @@
 #include "gpu/command_buffer/service/shader_manager.h"
 #include "gpu/command_buffer/service/texture_manager.h"
 #include "gpu/command_buffer/service/transfer_buffer_manager.h"
+#include "gpu/command_buffer/service/valuebuffer_manager.h"
 #include "ui/gl/gl_implementation.h"
 
 namespace gpu {
@@ -121,6 +122,7 @@ bool ContextGroup::Initialize(
   renderbuffer_manager_.reset(new RenderbufferManager(
       memory_tracker_.get(), max_renderbuffer_size, max_samples,
       depth24_supported));
+  valuebuffer_manager_.reset(new ValuebufferManager());
   shader_manager_.reset(new ShaderManager());
 
   // Lookup GL things we need to know.
@@ -300,6 +302,11 @@ void ContextGroup::Destroy(GLES2Decoder* decoder, bool have_context) {
     renderbuffer_manager_.reset();
   }
 
+  if (valuebuffer_manager_ != NULL) {
+    valuebuffer_manager_->Destroy();
+    valuebuffer_manager_.reset();
+  }
+
   if (texture_manager_ != NULL) {
     texture_manager_->Destroy(have_context);
     texture_manager_.reset();