Implement ComboView for Bookmarks, History and SavedPages

 - Replaces ComboViewActivity for PhoneUi.
 - Lives as part of the BrowserActivity's ViewTree.
 - Avoids construction of ComboViewActivity everytime the bookmarks screen is opened.

Change-Id: Ic7042de731a4cc2107a297c9f7d4356bc2c30f2e
diff --git a/src/com/android/browser/BaseUi.java b/src/com/android/browser/BaseUi.java
index fbaaad1..24435b4 100644
--- a/src/com/android/browser/BaseUi.java
+++ b/src/com/android/browser/BaseUi.java
@@ -589,6 +589,10 @@
     }
 
     @Override
+    public void hideComboView() {
+    }
+
+    @Override
     public void showCustomView(View view, int requestedOrientation,
             CustomViewCallback callback) {
         // if a view already exists then immediately terminate the new one
@@ -637,6 +641,11 @@
         return mCustomView == null;
     }
 
+    @Override
+    public boolean isComboViewShowing() {
+        return false;
+    }
+
     // -------------------------------------------------------------------------
 
     protected void updateNavigationState(Tab tab) {