Adding a unique runtime Id to Profile objects, that can be used as the key...

chrome/test/testing_profile.h

Index: chrome/test/testing_profile.h
===================================================================
--- chrome/test/testing_profile.h	(revision 28102)
+++ chrome/test/testing_profile.h	(working copy)
@@ -57,6 +57,10 @@
   // ownership of |theme_provider|.
   void UseThemeProvider(BrowserThemeProvider* theme_provider);
 
+  virtual ProfileId GetRuntimeId() {
+    return reinterpret_cast<ProfileId>(this);
+  }
+
   virtual FilePath GetPath() {
     return path_;
   }
@@ -221,4 +225,20 @@
   bool last_session_exited_cleanly_;
 };
 
+// A profile that derives from another profile.  This does not actually
+// override anything except the GetRuntimeId() in order to test sharing of
+// site information.
+class DerivedTestingProfile : public TestingProfile {
+ public:
+   DerivedTestingProfile(Profile* profile) : original_profile_(profile) {
+   }
+
+  virtual ProfileId GetRuntimeId() {
+    return original_profile_->GetRuntimeId();
+  }
+
+ protected:
+  Profile* original_profile_;
+};
+
 #endif  // CHROME_TEST_TESTING_PROFILE_H_