[Custom Tabs] Implement Bottombar

chrome/android/java/src/android/support/customtabs/CustomTabsIntent.java

Index: chrome/android/java/src/android/support/customtabs/CustomTabsIntent.java
diff --git a/chrome/android/java/src/android/support/customtabs/CustomTabsIntent.java b/chrome/android/java/src/android/support/customtabs/CustomTabsIntent.java
index 5f035bf3fbc6c77d27e90e6ed6ba5a4cbc1ebd89..69291f3d0435d6b42deb5e336cd8c0fff8d315da 100644
--- a/chrome/android/java/src/android/support/customtabs/CustomTabsIntent.java
+++ b/chrome/android/java/src/android/support/customtabs/CustomTabsIntent.java
@@ -92,12 +92,55 @@ public class CustomTabsIntent {
             "android.support.customtabs.extra.EXIT_ANIMATION_BUNDLE";
 
     /**
+     * Extra bitmap that specifies the icon of the back button on the toolbar. If the client chooses
+     * not to customize it, a default close button will be used.
+     */
+    public static final String EXTRA_CLOSE_BUTTON_ICON =
+            "android.support.customtabs.extra.CLOSE_BUTTON_ICON";
+
+    /**
+     * Extra int that specifies state for showing the page title. Default is showing only the domain
+     * and no information about the title.
+     */
+    public static final String EXTRA_TITLE_VISIBILITY_STATE =
+            "android.support.customtabs.extra.TITLE_VISIBILITY";
+
+    /**
+     * Don't show any title. Shows only the domain.
+     */
+    public static final int NO_TITLE = 0;
+
+    /**
+     * Shows the page title and the domain.
+     */
+    public static final int SHOW_PAGE_TITLE = 1;
+
+    /**
+     * Extra boolean that specifies whether the custom action buttons should be tinted. Default is
+     * false and the action buttons will not be tinted. If true, all buttons will be tinted,
+     * regardless of their positions.
+     */
+    public static final String EXTRA_TINT_ACTION_BUTTON =
+            "android.support.customtabs.extra.TINT_ACTION_BUTTON";
+
+    /**
      * Boolean that specifies whether a default share button will be shown in the menu.
      */
     public static final String EXTRA_DEFAULT_SHARE_MENU_ITEM =
             "android.support.customtabs.extra.SHARE_MENU_ITEM";
 
     /**
+     * Key that specifies the unique id for an action button. To make a button to show on the
+     * toolbar, use {@link #TOOLBAR_ACTION_BUTTON_ID} as its id.
+     */
+    public static final String KEY_ID = "android.support.customtabs.customaction.ID";
+
+    /**
+     * The unique ID allocated to the action button that is shown on the toolbar.
+     */
+    public static final int TOOLBAR_ACTION_BUTTON_ID = 0;
+
+    /**
      * Convenience method to create a VIEW intent without a session for the given package.
      * @param packageName The package name to set in the intent.
      * @param data        The data {@link Uri} to be used in the intent.