Implement a modal permission dialog on Android gated by a feature.

chrome/browser/permissions/permission_dialog_delegate.h

Index: chrome/browser/permissions/permission_dialog_delegate.h
diff --git a/chrome/browser/permissions/permission_dialog_delegate.h b/chrome/browser/permissions/permission_dialog_delegate.h
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+++ b/chrome/browser/permissions/permission_dialog_delegate.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_DIALOG_DELEGATE_H_
+#define CHROME_BROWSER_PERMISSIONS_PERMISSION_DIALOG_DELEGATE_H_
+
+#include <memory>
+
+#include "base/android/scoped_java_ref.h"
+#include "base/callback.h"
+#include "base/macros.h"
+#include "chrome/browser/permissions/permission_util.h"
+#include "content/public/browser/permission_type.h"
+#include "content/public/browser/web_contents_observer.h"
+
+using base::android::JavaParamRef;
+using base::android::ScopedJavaLocalRef;
+
+namespace content {
+class WebContents;
+}
+
+class GURL;
+class PermissionInfoBarDelegate;
+class Profile;
+
+// Delegate class for displaying a permission prompt as a modal dialog. Used as
+// the native to Java interface to allow Java to communicate the user's
+// decision.
+//
+// This class currently wraps a PermissionInfoBarDelegate. Future refactoring
+// will consolidate PermissionInfoBarDelegate and its subclasses together into
+// GroupedPermissionInfoBarDelegate, which will then source all of its data from
+// an underlying PermissionPromptAndroid object. At that time, this class will
+// also change to wrap a PermissionPromptAndroid.
+class PermissionDialogDelegate : content::WebContentsObserver {
+ public:
+  using PermissionSetCallback = base::Callback<void(bool, PermissionAction)>;
+
+  // Creates a modal dialog for |type|.
+  static void Create(content::WebContents* web_contents,
+                     content::PermissionType type,
+                     const GURL& requesting_frame,
+                     bool user_gesture,
+                     Profile* profile,
+                     const PermissionSetCallback& callback);
+
+
+  // Returns true if we should show the user a modal permission prompt rather
+  // than an infobar.
+  static bool ShouldShowDialog(bool has_user_gesture);
+
+  // JNI methods.
+  static bool RegisterPermissionDialogDelegate(JNIEnv* env);
+  void Accept(JNIEnv* env, const JavaParamRef<jobject>& obj, jboolean persist);
+  void Cancel(JNIEnv* env, const JavaParamRef<jobject>& obj, jboolean persist);
+  void Dismissed(JNIEnv* env, const JavaParamRef<jobject>& obj);
+  void LinkClicked(JNIEnv* env, const JavaParamRef<jobject>& obj);
+
+  // Frees this object and the wrapped PermissionInfoBarDelegate. Called from
+  // Java once the permission dialog has been responded to.
+  void Destroy(JNIEnv* env, const JavaParamRef<jobject>& obj);
+
+ private:
+  PermissionDialogDelegate(
+      content::WebContents* web_contents,
+      std::unique_ptr<PermissionInfoBarDelegate> infobar_delegate_);
+  ~PermissionDialogDelegate() override;
+
+  ScopedJavaLocalRef<jobject> CreateJavaDelegate(JNIEnv* env);
+
+  // The InfoBarDelegate which this class is wrapping.
+  // TODO(dominickn,lshang) replace this with PermissionPromptAndroid as the
+  // permission prompt refactoring continues.
+  std::unique_ptr<PermissionInfoBarDelegate> infobar_delegate_;
+
+  DISALLOW_COPY_AND_ASSIGN(PermissionDialogDelegate);
+};
+
+#endif  // CHROME_BROWSER_PERMISSIONS_PERMISSION_DIALOG_DELEGATE_H_