Fix global dumps to be dumped only when shared memory is actually used

gpu/command_buffer/client/cmd_buffer_helper.cc

Index: gpu/command_buffer/client/cmd_buffer_helper.cc
diff --git a/gpu/command_buffer/client/cmd_buffer_helper.cc b/gpu/command_buffer/client/cmd_buffer_helper.cc
index 7021fa399f4ccf7f887667ab73589d5753206b43..faab3c867b32f449e845f42b3ecc6145108f7b04 100644
--- a/gpu/command_buffer/client/cmd_buffer_helper.cc
+++ b/gpu/command_buffer/client/cmd_buffer_helper.cc
@@ -377,10 +377,12 @@ bool CommandBufferHelper::OnMemoryDump(
     dump->AddScalar(
         "free_size", MemoryAllocatorDump::kUnitsBytes,
         GetTotalFreeEntriesNoWaiting() * sizeof(CommandBufferEntry));
-    auto guid = GetBufferGUIDForTracing(tracing_process_id, ring_buffer_id_);
-    const int kImportance = 2;
-    pmd->CreateSharedGlobalAllocatorDump(guid);
-    pmd->AddOwnershipEdge(dump->guid(), guid, kImportance);
+    if (ring_buffer_->backing()->is_shared()) {
+      auto guid = GetBufferGUIDForTracing(tracing_process_id, ring_buffer_id_);
+      const int kImportance = 2;
+      pmd->CreateSharedGlobalAllocatorDump(guid);
+      pmd->AddOwnershipEdge(dump->guid(), guid, kImportance);
+    }
   }
 
   return true;