Domain Reliability: Add rudimentary WebUI page.

components/domain_reliability/service.h

Index: components/domain_reliability/service.h
diff --git a/components/domain_reliability/service.h b/components/domain_reliability/service.h
index a1712c5744373f5a9779f1c3f8fd8dd6c08f02e1..784e6c01fbedd25d010898e211f0fc50f25a8e9a 100644
--- a/components/domain_reliability/service.h
+++ b/components/domain_reliability/service.h
@@ -16,9 +16,13 @@
 #include "components/domain_reliability/domain_reliability_export.h"
 #include "components/keyed_service/core/keyed_service.h"
 
+namespace base {
+class Value;
+}  // namespace base
+
 namespace net {
 class URLRequestContextGetter;
-};
+}  // namespace net
 
 namespace domain_reliability {
 
@@ -51,6 +55,10 @@ class DOMAIN_RELIABILITY_EXPORT DomainReliabilityService
   virtual void ClearBrowsingData(DomainReliabilityClearMode clear_mode,
                                  const base::Closure& callback) = 0;
 
+  virtual void GetWebUIData(
+      const base::Callback<void(scoped_ptr<const base::Value>)>& callback)
+      const = 0;
+
  protected:
   DomainReliabilityService();