Add documentation for platform/bindings

third_party/WebKit/Source/platform/bindings/V8ValueCache.h

Index: third_party/WebKit/Source/platform/bindings/V8ValueCache.h
diff --git a/third_party/WebKit/Source/platform/bindings/V8ValueCache.h b/third_party/WebKit/Source/platform/bindings/V8ValueCache.h
index f34d4b0ef4f2559471daac8fb146637fc0404e14..a64630bccd904ec9bef2b0d0968227ac73246c31 100644
--- a/third_party/WebKit/Source/platform/bindings/V8ValueCache.h
+++ b/third_party/WebKit/Source/platform/bindings/V8ValueCache.h
@@ -74,6 +74,9 @@ class StringCacheMapTraits
   static void DisposeWeak(const v8::WeakCallbackInfo<WeakCallbackDataType>&);
 };
 
+// String cache helps convert WTF strings (StringImpl*) into v8 strings by
+// only creating a v8::String for a particular StringImpl* once and caching it
+// for future use. It is held by and can be retrieved from V8PerIsolateData.

[haraken, 2017/04/29 02:39:11]

Add a comment about how the cache is maintained (when the entry is evicted, when
the cache is cleared).

[adithyas, 2017/05/01 17:41:16]

Done.

 class PLATFORM_EXPORT StringCache {
   USING_FAST_MALLOC(StringCache);
   WTF_MAKE_NONCOPYABLE(StringCache);