Document FetchRequest class

third_party/WebKit/Source/core/fetch/FetchRequest.h

Index: third_party/WebKit/Source/core/fetch/FetchRequest.h
diff --git a/third_party/WebKit/Source/core/fetch/FetchRequest.h b/third_party/WebKit/Source/core/fetch/FetchRequest.h
index ea7a0daa991e2a065dde7ac1efe948048085e398..de5f3461da6b52e40b705b23a1b1fec4f767815d 100644
--- a/third_party/WebKit/Source/core/fetch/FetchRequest.h
+++ b/third_party/WebKit/Source/core/fetch/FetchRequest.h
@@ -39,6 +39,8 @@
 namespace blink {
 class SecurityOrigin;
 
+// A FetchRequest is a "parameter object" for ResourceFetcher::requestResource
+// to avoid the method having too many arguments.
 class CORE_EXPORT FetchRequest {
   STACK_ALLOCATED();