Add an about flag to toggle the visibility of "All bookmarks"

chrome/android/java/src/org/chromium/chrome/browser/ChromeSwitches.java

Index: chrome/android/java/src/org/chromium/chrome/browser/ChromeSwitches.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/ChromeSwitches.java b/chrome/android/java/src/org/chromium/chrome/browser/ChromeSwitches.java
index 6bbbb38ef57b0632fb8933edf9be9d9d354dc6d9..7ee383da0952609d151fc23ed39b549d11bf4324 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/ChromeSwitches.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/ChromeSwitches.java
@@ -240,6 +240,11 @@ public abstract class ChromeSwitches {
      */
     public static final String PARTNER_HOMEPAGE_FOR_TESTING = "partner-homepage-for-testing";
 
+    /**
+     * Enables the all bookmarks section in bookmark manager.
+     */
+    public static final String ENABLE_ALL_BOOKMARKS_VIEW = "enable-all-bookmarks-view";
+
     // Prevent instantiation.
     private ChromeSwitches() {}
 }