Add a method to WebContentsTester to set the loading state of the

content/browser/web_contents/test_web_contents.cc

Index: content/browser/web_contents/test_web_contents.cc
===================================================================
--- content/browser/web_contents/test_web_contents.cc	(revision 136630)
+++ content/browser/web_contents/test_web_contents.cc	(working copy)
@@ -115,6 +115,10 @@
   CommitPendingNavigation();
 }
 
+void TestWebContents::TestSetIsLoading(bool value) {
+  SetIsLoading(value, NULL);
+}
+
 void TestWebContents::CommitPendingNavigation() {
   // If we are doing a cross-site navigation, this simulates the current RVH
   // notifying that it has unloaded so the pending RVH is resumed and can