Add ExternalPrerenderRequestHandler and related API

chrome/browser/prerender/external_prerender_handler_android.h

+// Copyright 2013 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_PRERENDER_EXTERNAL_PRERENDER_HANDLER_ANDROID_H_
+#define CHROME_BROWSER_PRERENDER_EXTERNAL_PRERENDER_HANDLER_ANDROID_H_
+
+#include <jni.h>
+
+#include "base/android/scoped_java_ref.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+
+class GURL;
+class Profile;
+
+namespace content {
+class WebContents;
+}
+
+namespace prerender {
+class PrerenderHandle;
+
+// A class for handling external prerender requests from other applications.
+class ExternalPrerenderHandlerAndroid {
+ public:
+  explicit ExternalPrerenderHandlerAndroid();
+
+  // Add a prerender with the given url and referrer on the PrerenderManager of
+  // the given profile. The prerender_handle_ will be resetted with the

[cbentzel, 2013/11/01 10:45:20]

Nit: prerender_handle_ is an internal implementation detail. You may want to
mention that this restricts to just one external prerender at a time.

[Yusuf, 2013/11/01 17:04:01]

Done.

+  // resulting PrerenderHandler.
+  bool AddPrerender(JNIEnv* env,
+                   jobject obj,

[cbentzel, 2013/11/01 10:45:20]

Nit: indent by one space to line up with previous line.

[Yusuf, 2013/11/01 17:04:01]

Done.

+                   jobject profile,
+                   jint web_content_ptr,
+                   jstring url,
+                   jstring referrer,
+                   jint width,
+                   jint height);
+
+  // Cancel the prerender associated with the prerender_handle_
+  void CancelCurrentPrerender(JNIEnv* env, jobject object);
+
+  // Whether the PrerenderManager associated with the given profile has any
+  // prerenders for the url.
+  static bool HasPrerenderedUrl(Profile* profile,
+                                GURL url,
+                                content::WebContents* web_contents);
+
+  static bool RegisterExternalPrerenderHandlerAndroid(JNIEnv* env);
+
+ private:
+  virtual ~ExternalPrerenderHandlerAndroid();
+  scoped_ptr<prerender::PrerenderHandle> prerender_handle_;
+
+  DISALLOW_COPY_AND_ASSIGN(ExternalPrerenderHandlerAndroid);
+};
+
+} // namespace prerender
+
+#endif  // CHROME_BROWSER_PRERENDER_EXTERNAL_PRERENDER_HANDLER_ANDROID_H_