[Android] Add enhanced bookmarks grid/list view experiment.

chrome/android/java/src/org/chromium/chrome/browser/enhanced_bookmarks/EnhancedBookmarksBridge.java

Index: chrome/android/java/src/org/chromium/chrome/browser/enhanced_bookmarks/EnhancedBookmarksBridge.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/enhanced_bookmarks/EnhancedBookmarksBridge.java b/chrome/android/java/src/org/chromium/chrome/browser/enhanced_bookmarks/EnhancedBookmarksBridge.java
index e629bfe3f67cc6a19bcb1c926b2d5048a400bb7f..080bced02d5fa4dc7b7d39256024b9c226eb57a3 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/enhanced_bookmarks/EnhancedBookmarksBridge.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/enhanced_bookmarks/EnhancedBookmarksBridge.java
@@ -268,6 +268,13 @@ public final class EnhancedBookmarksBridge {
     }
 
     /**
+     * @see |enhanced_bookmarks::GetDefaultViewMode()|
+     */
+    public static int getDefaultViewMode() {
+        return nativeGetDefaultViewMode();
+    }
+
+    /**
      * @return Return the cache if it is stored in the static weak reference, or create a new empty
      *         one if the reference is empty.
      */
@@ -337,4 +344,5 @@ public final class EnhancedBookmarksBridge {
             String url, SalientImageCallback callback);
     private native void nativeFetchImageForTab(long nativeEnhancedBookmarksBridge,
             WebContents webContents);
+    private static native int nativeGetDefaultViewMode();
 }