[tracing] Add WebCache memory usage in Blink to chrome://tracing

components/web_cache.gypi

 # Copyright (c) 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'targets': [
     {
       'target_name': 'web_cache_common',
       'type': 'static_library',
       'dependencies': [
@@ skipping 31 matching lines @@
     {
       'target_name': 'web_cache_renderer',
       'type': 'static_library',
       'dependencies': [
         '<(DEPTH)/base/base.gyp:base',
         '<(DEPTH)/content/content.gyp:content_renderer',
         '<(DEPTH)/third_party/WebKit/public/blink.gyp:blink',
         'web_cache_common',
       ],
       'sources': [
+        'web_cache/renderer/web_cache_memory_dump_provider.cc',
+        'web_cache/renderer/web_cache_memory_dump_provider.h',
         'web_cache/renderer/web_cache_render_process_observer.cc',
         'web_cache/renderer/web_cache_render_process_observer.h',
       ],
     },
   ],
 }