Upstream oodles of Chrome for Android code into Chromium.

chrome/android/java_staging/src/org/chromium/chrome/browser/widget/VerticallyFixedEditText.java

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.chrome.browser.widget;
+
+import android.content.Context;
+import android.support.v7.widget.AppCompatEditText;
+import android.util.AttributeSet;
+import android.widget.EditText;
+
+/**
+ * This custom {@link EditText} does not allow the user to scroll the text vertically.  This is
+ * can be useful when the EditText is put into a layout where it is smaller than it's normal height.
+ */
+public class VerticallyFixedEditText extends AppCompatEditText {
+
+    public VerticallyFixedEditText(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    private boolean mBringingPointIntoView = false;
+
+    @Override
+    public boolean bringPointIntoView(int offset) {
+        try {
+            mBringingPointIntoView = true;
+            return super.bringPointIntoView(offset);
+        } finally {
+            mBringingPointIntoView = false;
+        }
+    }
+
+    @Override
+    public void scrollTo(int x, int y) {
+        // To prevent vertical scroll on touch events, only allow
+        // TextView.bringPointIntoView(...) to change the vertical scroll.
+        super.scrollTo(x, mBringingPointIntoView ? y : getScrollY());
+    }
+
+}