[IndexedDB] Adding txn, value, and key size metrics

third_party/WebKit/Source/modules/indexeddb/IDBObjectStore.cpp

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 493 matching lines @@
     index_ids.push_back(it.key);
     index_keys.push_back(keys);
   }
 
   IDBRequest* request =
       IDBRequest::Create(script_state, source, transaction_.Get());
   Vector<char> wire_bytes;
   serialized_value->ToWireBytes(wire_bytes);
   RefPtr<SharedBuffer> value_buffer = SharedBuffer::AdoptVector(wire_bytes);
 
+  UMA_HISTOGRAM_MEMORY_KB("WebCore.IndexedDB.PutValueSize",
+                          value_buffer->size());
+

[pwnall, 2017/05/23 23:01:10]

Could you please also UMA the number of Blobs attached to a value?

[dmurph, 2017/05/24 02:01:58]

Done.

   request->StorePutOperationBlobs(serialized_value->BlobDataHandles());
 
   BackendDB()->Put(transaction_->Id(), Id(), WebData(value_buffer), blob_info,
                    key, static_cast<WebIDBPutMode>(put_mode),
                    request->CreateWebCallbacks().release(), index_ids,
                    index_keys);
   return request;
 }
 
 IDBRequest* IDBObjectStore::deleteFunction(ScriptState* script_state,
@@ skipping 535 matching lines @@
     }
   }
   return IDBIndexMetadata::kInvalidId;
 }
 
 WebIDBDatabase* IDBObjectStore::BackendDB() const {
   return transaction_->BackendDB();
 }
 
 }  // namespace blink