Implement SamplerManager in the command buffer

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 aeae5c65b64755c10b67555bfd9c4034c85ab078..e38b19e04f75cae587942db1b3abfdfe66e87ef7 100644
--- a/gpu/command_buffer/service/context_group.cc
+++ b/gpu/command_buffer/service/context_group.cc
@@ -16,6 +16,7 @@
 #include "gpu/command_buffer/service/path_manager.h"
 #include "gpu/command_buffer/service/program_manager.h"
 #include "gpu/command_buffer/service/renderbuffer_manager.h"
+#include "gpu/command_buffer/service/sampler_manager.h"
 #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"
@@ -149,6 +150,7 @@ bool ContextGroup::Initialize(GLES2Decoder* decoder,
       memory_tracker_.get(), max_renderbuffer_size, max_samples,
       feature_info_.get()));
   shader_manager_.reset(new ShaderManager());
+  sampler_manager_.reset(new SamplerManager(feature_info_.get()));
   valuebuffer_manager_.reset(
       new ValuebufferManager(subscription_ref_set_.get(),
                              pending_valuebuffer_state_.get()));
@@ -371,6 +373,11 @@ void ContextGroup::Destroy(GLES2Decoder* decoder, bool have_context) {
     shader_manager_.reset();
   }
 
+  if (sampler_manager_ != NULL) {
+    sampler_manager_->Destroy(have_context);
+    sampler_manager_.reset();
+  }
+
   if (valuebuffer_manager_ != NULL) {
     valuebuffer_manager_->Destroy();
     valuebuffer_manager_.reset();