Add a feature which, when enabled, blocks permissions after X prompt dismissals.

chrome/browser/permissions/permission_decision_auto_blocker.h

Index: chrome/browser/permissions/permission_decision_auto_blocker.h
diff --git a/chrome/browser/permissions/permission_decision_auto_blocker.h b/chrome/browser/permissions/permission_decision_auto_blocker.h
new file mode 100644
index 0000000000000000000000000000000000000000..997ac062388865448b6494a4e03d181a2dcb7198
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+++ b/chrome/browser/permissions/permission_decision_auto_blocker.h
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+// Copyright 2016 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_PERMISSIONS_PERMISSION_DECISION_AUTO_BLOCKER_H_
+#define CHROME_BROWSER_PERMISSIONS_PERMISSION_DECISION_AUTO_BLOCKER_H_
+
+#include "base/callback_forward.h"
+#include "base/macros.h"
+#include "content/public/browser/permission_type.h"
+#include "url/gurl.h"
+
+class GURL;
+class Profile;
+
+class PermissionDecisionAutoBlocker {
+ public:
+  // Removes any recorded counts for urls which match |filter| under |profile|.
+  static void RemoveCountsByUrl(Profile* profile,
+                                base::Callback<bool(const GURL& url)> filter);
+
+  explicit PermissionDecisionAutoBlocker(Profile* profile);
+
+  // Records that an ignore of a prompt for |permission| was made.
+  int RecordIgnore(const GURL& url, content::PermissionType permission);
+
+  // Records that a dismissal of a prompt for |permission| was made, and returns
+  // true if this dismissal should be considered a block. False otherwise.
+  bool ShouldChangeDismissalToBlock(const GURL& url,
+                                    content::PermissionType permission);
+
+ private:
+  friend class PermissionContextBaseTests;
+  friend class PermissionDecisionAutoBlockerUnitTest;
+  friend class RemovePermissionPromptCountsTest;
+
+  // Keys used for storing count data in a website setting.
+  static const char kPromptDismissCountKey[];
+  static const char kPromptIgnoreCountKey[];
+
+  // Returns the current number of actions recorded under |key| for |permission|
+  // type at |url|.
+  int GetActionCountForTest(const GURL& url,
+                            content::PermissionType permission,
+                            const char* key);
+
+  // Records that the user performed an action for a prompt of type |permission|
+  // on |url| to a website setting keyed by |key|. Returns the total number of
+  // |key| actions which have been performed for |url|.
+  int RecordActionInWebsiteSettings(const GURL& url,
+                                    content::PermissionType permission,
+                                    const char* key);
+
+  // Updates |prompt_dismissals_before_block_|.
+  void UpdateFromVariations();
+
+  Profile *profile_;
+  int prompt_dismissals_before_block_;
+};
+
+#endif  // CHROME_BROWSER_PERMISSIONS_PERMISSION_DECISION_AUTO_BLOCKER_H_