Update support lib to last released state

customtabs/src/android/support/customtabs/CustomTabsSession.java

Index: customtabs/src/android/support/customtabs/CustomTabsSession.java
diff --git a/customtabs/src/android/support/customtabs/CustomTabsSession.java b/customtabs/src/android/support/customtabs/CustomTabsSession.java
index ee45b7c7ce83f4690dd5085edcfc37d3e033480e..a51cf0ea1eca8e2a59a5bf32e74f3de554cd341b 100644
--- a/customtabs/src/android/support/customtabs/CustomTabsSession.java
+++ b/customtabs/src/android/support/customtabs/CustomTabsSession.java
@@ -17,10 +17,12 @@
 package android.support.customtabs;
 
 import android.content.ComponentName;
+import android.graphics.Bitmap;
 import android.net.Uri;
 import android.os.Bundle;
 import android.os.IBinder;
 import android.os.RemoteException;
+import android.support.annotation.NonNull;
 
 import java.util.List;
 
@@ -65,6 +67,27 @@ public final class CustomTabsSession {
         }
     }
 
+    /**
+     * Update the visuals for the button on a custom tab. Will only succeed if the given
+     * session is the active one in browser.
+     * @param icon          The new icon of the action button.
+     * @param description   Content description of the action button.
+     * @return              Whether the update succeeded.
+     */
+    public boolean setActionButton(@NonNull Bitmap icon, @NonNull String description) {
+        Bundle bundle = new Bundle();
+        bundle.putParcelable(CustomTabsIntent.KEY_ICON, icon);
+        bundle.putString(CustomTabsIntent.KEY_DESCRIPTION, description);
+
+        Bundle metaBundle = new Bundle();
+        metaBundle.putBundle(CustomTabsIntent.EXTRA_ACTION_BUTTON_BUNDLE, bundle);
+        try {
+            return mService.updateVisuals(mCallback, metaBundle);
+        } catch (RemoteException e) {
+            return false;
+        }
+    }
+
     /* package */ IBinder getBinder() {
         return mCallback.asBinder();
     }
@@ -72,4 +95,4 @@ public final class CustomTabsSession {
     /* package */ ComponentName getComponentName() {
         return mComponentName;
     }
-}
+}