Log IDB leveldb uma stats into LevelDBEnv.IDB. Other LevelDB consumers will

third_party/leveldatabase/leveldatabase.gyp

 # Copyright (c) 2011 The LevelDB Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file. See the AUTHORS file for names of contributors.
 
 {
   'variables': {
     'use_snappy%': 0,
   },
   'target_defaults': {
     'defines': [
@@ skipping 31 matching lines @@
         ['use_snappy', {
           'dependencies': [
             '../../third_party/snappy/snappy.gyp:snappy',
           ],
         }],
       ],
       'direct_dependent_settings': {
         'include_dirs': [
           'src/include/',
           'src/',
+          '.',
         ],
         'conditions': [
           ['OS == "win"', {
             'include_dirs': [
               'src/port/win',
             ],
           }],
         ],
       },
       # Patch posted for upstream, can be removed once that's landed and
       # rolled into Chromium.
       # Internal link: https://mondrian.corp.google.com/#review/29997992
       'msvs_disabled_warnings': [
         # Signed/unsigned comparison.
         4018,
       ],
       'sources': [
         # Include and then exclude so that all files show up in IDEs, even if
         # they don't build.
         'env_chromium.cc',
+        'env_idb.h',
         'port/port_chromium.cc',
         'port/port_chromium.h',
         'src/db/builder.cc',
         'src/db/builder.h',
         'src/db/db_impl.cc',
         'src/db/db_impl.h',
         'src/db/db_iter.cc',
         'src/db/db_iter.h',
         'src/db/filename.cc',
         'src/db/filename.h',
@@ skipping 267 matching lines @@
       ],
     },
   ],
 }
 
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