Add an experimental search widget

chrome/android/java/src/org/chromium/chrome/browser/searchwidget/SearchBoxDataProvider.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.chrome.browser.searchwidget;
+
+import org.chromium.base.library_loader.LibraryLoader;
+import org.chromium.chrome.browser.ntp.NewTabPage;
+import org.chromium.chrome.browser.omnibox.LocationBarLayout;
+import org.chromium.chrome.browser.search_engines.TemplateUrlService;
+import org.chromium.chrome.browser.tab.Tab;
+import org.chromium.chrome.browser.toolbar.ToolbarDataProvider;
+
+class SearchBoxDataProvider implements ToolbarDataProvider, TemplateUrlService.LoadListener {
+    private Tab mTab;
+    private String mVerbatimUrl;
+
+    /**
+     * Called when native library is loaded and a tab has been initialized.
+     * @param tab The tab to use.
+     */
+    public void onNativeLibraryReady(Tab tab) {
+        assert LibraryLoader.isInitialized();
+
+        mTab = tab;
+
+        TemplateUrlService service = TemplateUrlService.getInstance();
+        service.registerLoadListener(this);
+        service.load();
+    }
+
+    @Override
+    public void onTemplateUrlServiceLoaded() {
+        // For zero suggest, the default search engine's URL is used as the first suggestion.
+        TemplateUrlService service = TemplateUrlService.getInstance();
+        String searchEngineUrl = service.getSearchEngineUrlFromTemplateUrl(
+                service.getDefaultSearchEngineTemplateUrl().getKeyword());
+        mVerbatimUrl = LocationBarLayout.splitPathFromUrlDisplayText(searchEngineUrl).first;
+    }
+
+    @Override
+    public boolean isUsingBrandColor() {
+        return false;
+    }
+
+    @Override
+    public boolean isIncognito() {
+        if (mTab == null) return false;
+        return mTab.isIncognito();
+    }
+
+    @Override
+    public String getText() {
+        return null;
+    }
+
+    @Override
+    public Tab getTab() {
+        return mTab;
+    }
+
+    @Override
+    public int getPrimaryColor() {
+        return 0;
+    }
+
+    @Override
+    public NewTabPage getNewTabPageForCurrentTab() {
+        return null;
+    }
+
+    @Override
+    public String getCurrentUrl() {
+        return mVerbatimUrl;
+    }
+}