Add BACKGROUND dump mode to various GPU/CC MemoryDumpProviders

gpu/command_buffer/client/mapped_memory.cc

Index: gpu/command_buffer/client/mapped_memory.cc
diff --git a/gpu/command_buffer/client/mapped_memory.cc b/gpu/command_buffer/client/mapped_memory.cc
index 06f1f63e0c9c01e77aecb84be13364ec377bc4dd..0501d574e4b8671c09b4075c272d75bd425d598b 100644
--- a/gpu/command_buffer/client/mapped_memory.cc
+++ b/gpu/command_buffer/client/mapped_memory.cc
@@ -169,21 +169,31 @@ void MappedMemoryManager::FreeUnused() {
 bool MappedMemoryManager::OnMemoryDump(
     const base::trace_event::MemoryDumpArgs& args,
     base::trace_event::ProcessMemoryDump* pmd) {
+  using base::trace_event::MemoryAllocatorDump;
+  using base::trace_event::MemoryDumpLevelOfDetail;
+
+  if (args.level_of_detail == MemoryDumpLevelOfDetail::BACKGROUND) {
+    std::string dump_name =
+        base::StringPrintf("gpu/mapped_memory/manager_%d", tracing_id_);
+    MemoryAllocatorDump* dump = pmd->CreateAllocatorDump(dump_name);
+    dump->AddScalar(MemoryAllocatorDump::kNameSize,
+                    MemoryAllocatorDump::kUnitsBytes, allocated_memory_);
+
+    // Early out, no need for more detail in a BACKGROUND dump.
+    return true;
+  }
+
   const uint64_t tracing_process_id =
       base::trace_event::MemoryDumpManager::GetInstance()
           ->GetTracingProcessId();
-
   for (const auto& chunk : chunks_) {
     std::string dump_name = base::StringPrintf(
         "gpu/mapped_memory/manager_%d/chunk_%d", tracing_id_, chunk->shm_id());
-    base::trace_event::MemoryAllocatorDump* dump =
-        pmd->CreateAllocatorDump(dump_name);
-
-    dump->AddScalar(base::trace_event::MemoryAllocatorDump::kNameSize,
-                    base::trace_event::MemoryAllocatorDump::kUnitsBytes,
-                    chunk->GetSize());
-    dump->AddScalar("free_size",
-                    base::trace_event::MemoryAllocatorDump::kUnitsBytes,
+    MemoryAllocatorDump* dump = pmd->CreateAllocatorDump(dump_name);
+
+    dump->AddScalar(MemoryAllocatorDump::kNameSize,
+                    MemoryAllocatorDump::kUnitsBytes, chunk->GetSize());
+    dump->AddScalar("free_size", MemoryAllocatorDump::kUnitsBytes,
                     chunk->GetFreeSize());
 
     auto guid = GetBufferGUIDForTracing(tracing_process_id, chunk->shm_id());