Tooltip for home page menu buttons

chrome/android/java/src/org/chromium/chrome/browser/util/AccessibilityUtil.java

Index: chrome/android/java/src/org/chromium/chrome/browser/util/AccessibilityUtil.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/util/AccessibilityUtil.java b/chrome/android/java/src/org/chromium/chrome/browser/util/AccessibilityUtil.java
index 9d4a6ce167c56335f3b9d19a3dbfb85245c9ec53..d643e304be66fbe1d182bdd9cf408e488a6f326e 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/util/AccessibilityUtil.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/util/AccessibilityUtil.java
@@ -10,12 +10,15 @@ import android.content.DialogInterface;
 import android.content.Intent;
 import android.net.Uri;
 import android.support.v7.app.AlertDialog;
+import android.view.Gravity;
+import android.view.View;
 import android.view.accessibility.AccessibilityManager;
 
 import org.chromium.base.ContextUtils;
 import org.chromium.base.PackageUtils;
 import org.chromium.base.TraceEvent;
 import org.chromium.chrome.R;
+import org.chromium.ui.widget.Toast;
 
 import java.util.List;
 
@@ -115,4 +118,30 @@ public class AccessibilityUtil {
         AlertDialog dialog = builder.create();
         dialog.show();
     }
+
+    /**
+     * Shows the content description toast for items on the toolbar.
+     * @param context The context to use for the toast.
+     * @param view The view to anchor the toast.
+     * @param description The string shown in the toast.
+     * @return Whether a toast has been shown successfully.
+     */
+    public static boolean showAccessibilityToast(
+            Context context, View view, CharSequence description) {
+        if (description == null) return false;
+
+        final int screenWidth = context.getResources().getDisplayMetrics().widthPixels;
+        final int screenHeight = context.getResources().getDisplayMetrics().heightPixels;
+        final int[] screenPos = new int[2];
+        view.getLocationOnScreen(screenPos);
+        final int width = view.getWidth();
+        final int height = view.getHeight();
+
+        Toast toast = Toast.makeText(context, description, Toast.LENGTH_SHORT);
+        toast.setGravity(Gravity.TOP | Gravity.END, screenWidth - screenPos[0] - width / 2,
+                (screenPos[1] < screenHeight / 2) ? screenPos[1] + height / 2
+                                                  : screenPos[1] - height * 3 / 2);
+        toast.show();
+        return true;
+    }
 }