Add FeedbackReporter for reporting distillation quality.

chrome/browser/android/dom_distiller/feedback_reporter_android.h

Index: chrome/browser/android/dom_distiller/feedback_reporter_android.h
diff --git a/chrome/browser/android/dom_distiller/feedback_reporter_android.h b/chrome/browser/android/dom_distiller/feedback_reporter_android.h
new file mode 100644
index 0000000000000000000000000000000000000000..3d2d462f70a2fd37c56da261d03c52ac5974ce62
--- /dev/null
+++ b/chrome/browser/android/dom_distiller/feedback_reporter_android.h
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+// Copyright 2014 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_DOM_DISTILLER_FEEDBACK_REPORTER_ANDROID_H_
+#define CHROME_BROWSER_ANDROID_DOM_DISTILLER_FEEDBACK_REPORTER_ANDROID_H_
+
+#include <jni.h>
+
+#include "base/android/jni_helper.h"
+#include "content/public/browser/web_contents.h"
+#include "content/public/browser/web_contents_observer.h"
+
+namespace content {
+struct FrameNavigateParams;
+struct LoadCommittedDetails;
+}  // namespace content
+
+namespace dom_distiller {
+
+namespace android {
+
+class FeedbackReporterAndroid : content::WebContentsObserver {
+ public:
+  FeedbackReporterAndroid(JNIEnv* env, jobject obj);
+  virtual ~FeedbackReporterAndroid();
+
+  // Destroys the FeedbackReporterAndroid.
+  void Destroy(JNIEnv* env, jobject obj);
+
+  // Observes a new WebContents, if necessary.
+  void ReplaceWebContents(JNIEnv* env, jobject obj, jobject jweb_contents);
+
+  // WebContentsObserver implementation:
+  virtual void DidNavigateMainFrame(
+      const content::LoadCommittedDetails& details,
+      const content::FrameNavigateParams& params) OVERRIDE;
+
+  static jboolean IsReportableUrl(JNIEnv* env, jclass clazz);
+
+ private:
+  // FeedbackReporterAndroid on the Java side.
+  JavaObjectWeakGlobalRef weak_java_feedback_reporter_;
+
+  DISALLOW_COPY_AND_ASSIGN(FeedbackReporterAndroid);
+};
+
+// Registers the FeedbackReporter's native methods through JNI.
+bool RegisterFeedbackReporter(JNIEnv* env);
+
+}  // namespace android
+
+}  // namespace dom_distiller
+
+#endif  // CHROME_BROWSER_ANDROID_DOM_DISTILLER_FEEDBACK_REPORTER_ANDROID_H_