Tied up BlimpNavigationController to NavigationFeature

blimp/client/core/public/android/java/src/org/chromium/blimp/core_public/BlimpNavigationController.java

Index: blimp/client/core/public/android/java/src/org/chromium/blimp/core_public/BlimpNavigationController.java
diff --git a/blimp/client/core/public/android/java/src/org/chromium/blimp/core_public/BlimpNavigationController.java b/blimp/client/core/public/android/java/src/org/chromium/blimp/core_public/BlimpNavigationController.java
index 2e60b97d2527c00097ae451b1087be54b3c64408..9f1267fd7a4cdc6fd32dbbf7e62eebdef6ea52e5 100644
--- a/blimp/client/core/public/android/java/src/org/chromium/blimp/core_public/BlimpNavigationController.java
+++ b/blimp/client/core/public/android/java/src/org/chromium/blimp/core_public/BlimpNavigationController.java
@@ -26,4 +26,29 @@ public interface BlimpNavigationController {
      * Retrieves the URL of the currently selected item in the navigation list.
      */
     String getUrl();
-}
+
+    /**
+     * @return Whether back navigation is possible from the "current entry".
+     */
+    boolean canGoBack();
+
+    /**
+     * @return Whether forward navigation is possible from the "current entry".
+     */
+    boolean canGoForward();
+
+    /**
+     * Goes to the navigation entry before the current one.
+     */
+    void goBack();
+
+    /**
+     * Goes to the navigation entry following the current one.
+     */
+    void goForward();
+
+    /**
+     * Reload the current page.

[David Trainor- moved to gerrit, 2016/06/29 17:27:15]

Add @param checkForRepost and explain what it is.

[shaktisahu, 2016/07/19 21:45:29]

Done.

+     */
+    public void reload(boolean checkForRepost);
+}