[Contextual Search] Add Mojo-enabled API component.

chrome/browser/android/bottombar/overlay_panel_content.h

 // 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.
 
 #ifndef CHROME_BROWSER_ANDROID_BOTTOMBAR_OVERLAY_PANEL_CONTENT_H_
 #define CHROME_BROWSER_ANDROID_BOTTOMBAR_OVERLAY_PANEL_CONTENT_H_
 
 #include "base/android/jni_android.h"
 #include "base/task/cancelable_task_tracker.h"
 #include "chrome/browser/android/contextualsearch/contextual_search_context.h"
@@ skipping 23 matching lines @@
   void RemoveLastHistoryEntry(JNIEnv* env,
                               jobject obj,
                               jstring search_url,
                               jlong search_start_time_ms);
 
   // Takes ownership of the WebContents associated with the given
   // |ContentViewCore| which holds the panel content.
   void SetWebContents(JNIEnv* env, jobject obj, jobject jcontent_view_core,
                       jobject jweb_contents_delegate);
 
-  // Destroys the WebContents.
-  void DestroyWebContents(JNIEnv* env, jobject jobj);
+  // Destroys the WebContents and returns the destroyed render process host ID.
+  int DestroyWebContents(JNIEnv* env, jobject jobj);
 
   // Sets the delegate used to convert navigations to intents.
   void SetInterceptNavigationDelegate(JNIEnv* env,
                                       jobject obj,
                                       jobject delegate,
                                       jobject jweb_contents);
 
  private:
   // Our global reference to the Java OverlayPanelContent.
   base::android::ScopedJavaGlobalRef<jobject> java_manager_;
 
   // Used if we need to clear history.
   base::CancelableTaskTracker history_task_tracker_;
 
   // The WebContents that holds the panel content.
   scoped_ptr<content::WebContents> web_contents_;
   scoped_ptr<web_contents_delegate_android::WebContentsDelegateAndroid>
       web_contents_delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(OverlayPanelContent);
 };
 
 bool RegisterOverlayPanelContent(JNIEnv* env);
 
 #endif  // CHROME_BROWSER_ANDROID_BOTTOMBAR_OVERLAY_PANEL_CONTENT_H_