Update Google+ integration.

[UPDATED]   Google+ SDK to 1.1.0.

External/google-plus-ios-sdk/lib/GPPDeepLink.h

@@ -0,0 +1,39 @@
+//
+//  GPPDeepLink.h
+//  Google+ iOS SDK
+//
+//  Copyright 2012 Google Inc.
+//
+//  Usage of this SDK is subject to the Google+ Platform Terms of Service:
+//  https://developers.google.com/+/terms
+//
+
+#import <Foundation/Foundation.h>
+
+@interface GPPDeepLink : NSObject
+
+// Returns a |GPPDeepLink| for your app to handle, or |nil| if not found. The
+// deep-link ID can be obtained from |GPPDeepLink|. It is stored when a user
+// clicks a link to your app from a Google+ post, but hasn't yet installed your
+// app. The user will be redirected to the App Store to install your app. This
+// method should be called on or near your app launch to take the user to
+// deep-link ID within your app.
++ (GPPDeepLink *)readDeepLinkAfterInstall;
+
+// This method should be called from your |UIApplicationDelegate|'s
+// |application:openURL:sourceApplication:annotation|. Returns
+// |GooglePlusDeepLink| if |GooglePlusDeepLink| handled this URL, |nil|
+// otherwise.
++ (GPPDeepLink *)handleURL:(NSURL *)url
+         sourceApplication:(NSString *)sourceApplication
+                annotation:(id)annotation;
+
+// The deep-link ID in |GPPDeepLink| that was passed to the app.
+- (NSString *)deepLinkID;
+
+// This indicates where the user came from before arriving in your app. This is
+// provided for you to collect engagement metrics. For the possible values,
+// see our developer docs at http://developers.google.com/+/mobile/ios/.
+- (NSString *)source;
+
+@end