[Contextual Search] Add Mojo-enabled API component.

chrome/android/java/src/org/chromium/chrome/browser/contextualsearch/ContextualSearchPolicy.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.contextualsearch;
 
 import android.content.Context;
 
 import org.chromium.base.VisibleForTesting;
 import org.chromium.chrome.browser.ChromeVersionInfo;
@@ skipping 286 matching lines @@
      * TODO(donnd): Update this API to definitively determine if it's OK to send the URL,
      * by merging the checks in the native contextual_search_delegate here.
      * @return {@code true} if the URL may be sent for policy reasons.
      *         Note that a return value of {@code true} may still require additional checks
      *         to see if all privacy-related conditions are met to send the base page URL.
      */
     boolean maySendBasePageUrl() {
         return !isUserUndecided();
     }
 
+    /**
+     * @return Whether Contextual Search should enable its API in the overlay panel.
+     */
+    boolean shouldEnableOverlayApi() {
+        return ContextualSearchFieldTrial.isQuickAnswersEnabled();
+    }
+
     // --------------------------------------------------------------------------------------------
     // Testing support.
     // --------------------------------------------------------------------------------------------
 
     /**
      * Resets all policy counters.
      */
     @VisibleForTesting
     void resetCounters() {
         updateCountersForOpen();
@@ skipping 102 matching lines @@
 
     /**
      * @return The limit of the number of taps to resolve using search term resolution.
      */
     private int getTapResolveLimit() {
         return isUserUndecided()
                 ? ContextualSearchFieldTrial.getTapResolveLimitForUndecided()
                 : ContextualSearchFieldTrial.getTapResolveLimitForDecided();
     }
 }