Profile WebCore::CachedMatchedProperties in dmprof.

tools/deep_memory_profiler/policy.l2.json

 {
   "components": [
     "second",
     "mmap-profiler",
     "mmap-type-profiler",
     "mmap-tcmalloc",
     "FROM_HERE_FOR_TOTAL",
     "mustbezero",
     "unhooked-absent",
     "unhooked-anonymous",
@@ skipping 183 matching lines @@
       "name": "mmap-skia-font",
       "stacktrace": ".*SkTypeface::openStream.*",
       "allocator": "mmap"
     },
     {
       "name": "mmap-catch-all",
       "stacktrace": ".*",
       "allocator": "mmap"
     },
     {
+      "name": "tc-webcore-cachedmatchedproperties",
+      "stacktrace": ".*WebCore::CachedMatchedProperties::(set|add).*",
+      "allocator": "malloc"
+    },
+    {
       "name": "tc-webcore-fontcache",
       "stacktrace": ".*WebCore::FontCache::getFontData.*",
       "allocator": "malloc"
     },
     {
       "name": "tc-skia",
       "stacktrace": ".* Sk[A-Za-z_]+::.*",
       "allocator": "malloc"
     },
     {
@@ skipping 302 matching lines @@
       "allocator": "optional"
     },
     {
       "name": "other",
       "stacktrace": "optional",
       "allocator": "optional"
     }
   ],
   "version": "POLICY_DEEP_3"
 }