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

chrome/browser/permissions/permission_prompt_decision_log.h

Index: chrome/browser/permissions/permission_prompt_decision_log.h
diff --git a/chrome/browser/permissions/permission_prompt_decision_log.h b/chrome/browser/permissions/permission_prompt_decision_log.h
new file mode 100644
index 0000000000000000000000000000000000000000..d450d9d089f8bd180c1c253139abeb64b3d17e6a
--- /dev/null
+++ b/chrome/browser/permissions/permission_prompt_decision_log.h
@@ -0,0 +1,29 @@
+// 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_PROMPT_DECISION_LOG_H_
+#define CHROME_BROWSER_PERMISSIONS_PERMISSION_PROMPT_DECISION_LOG_H_
+
+#include "base/macros.h"
+#include "content/public/browser/permission_type.h"
+#include "url/gurl.h"
+
+class GURL;
+class Profile;
+
+class PermissionPromptDecisionLog {

[raymes, 2016/08/01 05:09:11]

Yeah naming is hard! Maybe PermissionPromptDismissalLog? Or maybe even
PermissionPromptDismissalExperiment. I'm ok if we don't feel it's strictly
better.

[dominickn, 2016/08/03 05:38:46]

I didn't want to call it "Dismissal" in case we want to store other decision
types in the future.

+ public:
+  PermissionPromptDecisionLog();
+  bool ShouldChangeDismissalToBlock(Profile* profile,
+                                    const GURL& url,
+                                    content::PermissionType permission);
+
+ private:
+  void UpdateFromVariations();
+
+  int prompt_dismissals_before_block_;
+};
+
+

[raymes, 2016/08/01 05:09:11]

nit: no newline

[dominickn, 2016/08/03 05:38:46]

Done.

+#endif  // CHROME_BROWSER_PERMISSIONS_PERMISSION_PROMPT_DECISION_LOG_H_