Added |lastCommittedURL| and |visibleURL| to Tab's interface.

ios/chrome/browser/tabs/tab.h

Index: ios/chrome/browser/tabs/tab.h
diff --git a/ios/chrome/browser/tabs/tab.h b/ios/chrome/browser/tabs/tab.h
index 8c87b0266fa35edbb24b316e459b90fb22bbf297..3853a17c0440b3ac8b22046fafd5ce2b9396f7c7 100644
--- a/ios/chrome/browser/tabs/tab.h
+++ b/ios/chrome/browser/tabs/tab.h
@@ -106,6 +106,12 @@ extern NSString* const kProxyPassthroughHeaderValue;
 // Do not add new calls to this method.
 @property(nonatomic, readonly) const GURL& url;
 
+// Returns the URL of the last committed NavigationItem for this Tab.
+@property(nonatomic, readonly) const GURL& lastCommittedURL;
+
+// returns the URL of the visible NavigationItem for this Tab.

[Eugene But (OOO till 7-30), 2017/04/14 18:54:59]

s/returns/Returns

[kkhorimoto, 2017/04/14 23:02:21]

Done.

+@property(nonatomic, readonly) const GURL& visibleURL;
+
 // The Passkit Dialog provider used to show the UI to download a passkit object.
 @property(nonatomic, assign) id<PassKitDialogProvider> passKitDialogProvider;