Content class factory and generalized text selector

content/public/android/java/src/org/chromium/content/browser/factory/ContentClassFactory.java

+// Copyright 2017 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.content.browser.factory;

[boliu, 2017/03/03 18:19:09]

why different package?

so there's some layering things here. although it's not yet enforced and there's
lots of violations, embedder should only import from content_public

Embedder only needs "void installFactory()", so that's the only part that should
be in content_public. The actual factory and provider implementation can be in
content.

[Tima Vaisburd, 2017/03/04 02:25:07]

This is not done yet.

+
+import org.chromium.content.browser.ContextSelectionProvider;
+import org.chromium.content_public.browser.WebContents;
+import org.chromium.ui.base.WindowAndroid;
+
+/**
+ * A class factory for content browser layer.
+ */
+public class ContentClassFactory {
+    private static ContentClassFactory sSingleton;
+
+    /**
+     * Sets the factory object.
+     */
+    public static void set(ContentClassFactory factory) {
+        sSingleton = factory;
+    }
+
+    /**
+     * Returns the factory object.
+     */
+    public static ContentClassFactory get() {
+        return sSingleton;
+    }
+
+    /**
+     * Creates ContextSelectorProvider object.
+     */
+    public ContextSelectionProvider createContextSelectionProvider(

[boliu, 2017/03/03 18:19:09]

abstract

[Tima Vaisburd, 2017/03/04 02:25:07]

Instead I decides to have a regular |if (!signleton) singleton = new
Singleton();| so ContentClassFactory.get() is never null.

+            ContextSelectionProvider.Callback callback, WebContents webContents,
+            WindowAndroid windowAndroid) {
+        // Implemented by a subclass.
+        return null;
+    }
+}