Fix language spinners in translate infobar.

These spinners were no longer clickable as a side-effect of this CL
(https://codereview.chromium.org/657893005) which make the TextViews
inside the spinners clickable. As a result, the Spinner never received
click events.

Also, the spinner dropdown arrow was missing on pre-L devices because we
were creating the Spinner using "new Spinner()" instead of inflating it
from a resource. This is a no-no when using the AppCompat theme.

BUG=435491

Review URL: https://codereview.chromium.org/778533002

Cr-Commit-Position: refs/heads/master@{#306522}

chrome/android/java/res/layout/spinner.xml

+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright 2014 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. -->
+
+<!-- A plain old Spinner.
+
+     Why is this needed? Because spinners must be inflated from a resource for the AppCompat theme
+     to work. Simply calling new Spinner() will result in a missing spinner arrow on pre-L devices.
+
+     See the FAQ on this page:
+     http://android-developers.blogspot.com/2014/10/appcompat-v21-material-design-for-pre.html -->
+<Spinner />

chrome/android/java/src/org/chromium/chrome/browser/infobar/TranslateLanguagePanel.java

@@ -9,6 +9,7 @@ import android.graphics.Color;
 import android.text.SpannableString;
 import android.text.TextUtils;
 import android.text.style.ForegroundColorSpan;
+import android.util.TypedValue;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -103,8 +104,9 @@ public class TranslateLanguagePanel
         mTargetAdapter.measureWidthRequiredForView();
 
         // Create the spinners.
-        mSourceSpinner = new Spinner(context);
-        mTargetSpinner = new Spinner(context);
+        LayoutInflater inflater = LayoutInflater.from(context);
+        mSourceSpinner = (Spinner) inflater.inflate(R.layout.spinner, null);
+        mTargetSpinner = (Spinner) inflater.inflate(R.layout.spinner, null);
         mSourceSpinner.setOnItemSelectedListener(this);
         mTargetSpinner.setOnItemSelectedListener(this);
         mSourceSpinner.setAdapter(mSourceAdapter);
@@ -234,8 +236,9 @@ public class TranslateLanguagePanel
         public View getView(int position, View convertView, ViewGroup parent) {
             TextView result;
             if (!(convertView instanceof TextView)) {
-                result = (TextView) LayoutInflater.from(getContext()).inflate(
-                        R.layout.infobar_text, null);
+                result = new TextView(getContext());
+                result.setTextSize(TypedValue.COMPLEX_UNIT_PX,
+                        getContext().getResources().getDimension(R.dimen.infobar_text_size));
             } else {
                 result = (TextView) convertView;
             }