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

chrome/android/java/src/org/chromium/chrome/browser/permissions/PermissionDialogDelegate.java

+// 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.
+
+package org.chromium.chrome.browser.permissions;
+
+import android.app.Activity;
+
+import org.chromium.base.annotations.CalledByNative;
+import org.chromium.chrome.browser.ResourceId;
+import org.chromium.ui.base.WindowAndroid;
+
+/**
+ * Delegate class for modal permission dialogs. Contains all of the data displayed in a prompt,
+ * including the button strings, message text, link text, the icon, and whether or not to display
+ * a persistence toggle.
+ *
+ * This class is also the interface to the native-side permissions code. When the user responds to
+ * the permission dialog, the decision is conveyed across the JNI so that the native code can
+ * respond appropriately.
+ */
+public class PermissionDialogDelegate {
+    /** The native-side counterpart of this class */
+    private long mNativeDelegatePtr;
+
+    /** The activity for which to create the dialog. */
+    private Activity mActivity;
+
+    /** The icon to display in the dialog. */
+    private int mDrawableId;
+
+    /** Text shown in the dialog. */
+    private String mMessageText;
+
+    /** Text shown on the link, e.g. "Learn more". */
+    private String mLinkText;
+
+    /** Text shown on the primary button, e.g. "Allow". */
+    private String mPrimaryButtonText;
+
+    /** Text shown on the secondary button, e.g. "Block". */
+    private String mSecondaryButtonText;
+
+    /** Whether or not to show a toggle for opting out of persisting the decision. */
+    private boolean mShowPersistenceToggle;
+
+    /** Whether or not a decision has been made for this delegate */
+    private boolean mDecided;
+
+    public Activity getActivity() {
+        return mActivity;
+    }
+
+    public int getDrawableId() {
+        return mDrawableId;
+    }

[gone, 2016/10/27 20:33:34]

nit: Stick newlines in between

[dominickn, 2016/10/27 23:37:12]

Done.

+    public String getMessageText() {
+        return mMessageText;
+    }
+    public String getLinkText() {
+        return mLinkText;
+    }
+    public String getPrimaryButtonText() {
+        return mPrimaryButtonText;
+    }
+    public String getSecondaryButtonText() {
+        return mSecondaryButtonText;
+    }
+    public boolean shouldShowPersistenceToggle() {
+        return mShowPersistenceToggle;
+    }
+
+    public void onAccept(boolean persist) {
+        assert mNativeDelegatePtr != 0;
+        mDecided = true;
+        nativeAccept(mNativeDelegatePtr, persist);
+    }
+
+    public void onCancel(boolean persist) {
+        assert mNativeDelegatePtr != 0;
+        mDecided = true;
+        nativeCancel(mNativeDelegatePtr, persist);
+    }
+
+    public void onDismiss() {
+        assert mNativeDelegatePtr != 0;
+        if (!mDecided) nativeDismissed(mNativeDelegatePtr);
+        nativeDestroy(mNativeDelegatePtr);
+        mNativeDelegatePtr = 0;
+    }
+
+    public void onLinkClicked() {
+        assert mNativeDelegatePtr != 0;
+        nativeLinkClicked(mNativeDelegatePtr);
+    }
+
+    /**
+     * Called from C++ by |nativeDelegatePtr| to instantiate this class.
+     *
+     * @param nativeDelegatePtr     The native counterpart that this object owns.
+     * @param window                The window to create the dialog for.
+     * @param iconResourceId        The id of the icon to display in the dialog.
+     * @param message               The message to display in the dialog.
+     * @param linkText              The text to display in the link (if any).
+     * @param primaryTextButton     The text to display on the primary button.
+     * @param secondaryTextButton   The text to display on the primary button.
+     * @param showPersistenceToggle Whether or not to display a persistence toggle.
+     */
+    @CalledByNative
+    private static PermissionDialogDelegate create(long nativeDelegatePtr, WindowAndroid window,
+            int enumeratedIconId, String message, String linkText, String primaryButtonText,
+            String secondaryButtonText, boolean showPersistenceToggle) {
+        return new PermissionDialogDelegate(nativeDelegatePtr, window, enumeratedIconId, message,
+                linkText, primaryButtonText, secondaryButtonText, showPersistenceToggle);
+    }
+
+    /**
+     * Upon construction, this class takes ownership of the passed in native delegate.
+     */
+    private PermissionDialogDelegate(long nativeDelegatePtr, WindowAndroid window,
+            int enumeratedIconId, String message, String linkText, String primaryButtonText,
+            String secondaryButtonText, boolean showPersistenceToggle) {
+        mNativeDelegatePtr = nativeDelegatePtr;
+        mActivity = window.getActivity().get();
+        mDrawableId = ResourceId.mapToDrawableId(enumeratedIconId);
+        mMessageText = message;
+        mLinkText = linkText;
+        mPrimaryButtonText = primaryButtonText;
+        mSecondaryButtonText = secondaryButtonText;
+        mShowPersistenceToggle = showPersistenceToggle;
+    }
+
+    private native void nativeAccept(long nativePermissionDialogDelegate, boolean persist);
+    private native void nativeCancel(long nativePermissionDialogDelegate, boolean persist);
+    private native void nativeDismissed(long nativePermissionDialogDelegate);
+    private native void nativeLinkClicked(long nativePermissionDialogDelegate);
+    private native void nativeDestroy(long nativePermissionDialogDelegate);
+}