Make pull to refresh not perform regular reload (with cache revalidation)

content/public/browser/navigation_controller.h

Index: content/public/browser/navigation_controller.h
diff --git a/content/public/browser/navigation_controller.h b/content/public/browser/navigation_controller.h
index ac52ae13188730ea99ccac05ab66dac907d788c5..0301ab639eaae896a23030aecf4947df21473c18 100644
--- a/content/public/browser/navigation_controller.h
+++ b/content/public/browser/navigation_controller.h
@@ -357,6 +357,12 @@ class NavigationController {
   // is showing, initiates a new navigation to its URL.
   virtual void Reload(bool check_for_repost) = 0;

[newt (away), 2015/12/15 22:40:21]

Random side question: why not have a single Reload() method that takes a
ReloadType as a parameter? Seems like that would reduce proliferation of
ReloadXyz() methods everywhere.

[kinuko, 2015/12/15 22:54:38]

That's what ReloadInternal does.  I can kinda imagine that we didn't want to
sprinkle the various loading enums or we probably didn't have too many when we
started adding these.  Maybe we can revisit cleaning up this

 
+  // Like Reload(), but for refreshing page content and may not need to
+  // validate cache content.
+  // TODO(kinuko): Update the comment once we fix the cache validation
+  // behavior.
+  virtual void ReloadToRefreshContent(bool check_for_repost) = 0;
+
   // Like Reload(), but don't use caches (aka "shift-reload").
   virtual void ReloadIgnoringCache(bool check_for_repost) = 0;