Blink Plugins: Remove Shadow DOM Plugin Placeholder

Source/core/html/shadow/PluginPlaceholderElement.js

-// 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.
-
-'use strict';
-
-privateScriptController.installClass('PluginPlaceholderElement', function(PluginPlaceholderElementPrototype) {
-    // FIXME: Load this from a .css file.
-    var styleSource =
-        '#plugin-placeholder {' +
-        '    all: initial;' +
-        '    width: 100%;' +
-        '    height: 100%;' +
-        '    overflow: hidden;' +
-        '    display: flex;' +
-        '    align-items: center;' +
-        '    background: gray;' +
-        '    font: 12px -webkit-control;' +
-        '}' +
-        '#plugin-placeholder-content {' +
-        '    text-align: center;' +
-        '    margin: auto;' +
-        '}';
-
-    PluginPlaceholderElementPrototype.createdCallback = function() {
-        this.id = 'plugin-placeholder';
-
-        var styleElement = document.createElement('style');
-        styleElement.textContent = styleSource;
-
-        var contentElement = document.createElement('div');
-        contentElement.id = 'plugin-placeholder-content';
-
-        var messageElement = document.createElement('div');
-        messageElement.id = 'plugin-placeholder-message';
-
-        // FIXME: UI polish, l10n, etc. for the close button.
-        var closeButton = document.createElement('button');
-        closeButton.id = 'plugin-placeholder-close-button';
-        closeButton.textContent = 'Close';
-        closeButton.style.display = 'none';
-        closeButton.addEventListener('click', function() {
-            // FIXME: Record UMA Plugin_Hide_Click.
-            this.hide();
-        }.bind(this));
-
-        contentElement.appendChild(messageElement);
-        contentElement.appendChild(closeButton);
-        this.appendChild(styleElement);
-        this.appendChild(contentElement);
-
-        this.messageElement = messageElement;
-        this.closeButton = closeButton;
-    };
-
-    PluginPlaceholderElementPrototype.hide = function() {
-        var host = (this.parentNode instanceof ShadowRoot) ? this.parentNode.host : this;
-        host.style.display = 'none';
-
-        // If we have a width and height, search for a parent (often <div>) with the
-        // same dimensions. If we find such a parent, hide that as well.
-        // This makes much more uncovered page content usable (including clickable)
-        // as opposed to merely visible.
-        // TODO(cevans) -- it's a foul heuristic but we're going to tolerate it for
-        // now for these reasons:
-        // 1) Makes the user experience better.
-        // 2) Foulness is encapsulated within this single function.
-        // 3) Confidence in no false positives.
-        // 4) Seems to have a good / low false negative rate at this time.
-        //
-        // This heuristic was copied from plugins::PluginPlaceholder::HidePlugin
-        // (src/components/plugins/renderer/plugin_placeholder.cc) and should be
-        // kept in sync with it until it goes away.
-        if (host.hasAttribute('width') && host.hasAttribute('height')) {
-            var presentationAttributeInPixels = function(attr) {
-                var match = host.getAttribute(attr).match(/^\s*(\d+)\s*(px)?\s*$/);
-                if (match)
-                    return match[1] + 'px';
-            };
-            var width = presentationAttributeInPixels('width');
-            var height = presentationAttributeInPixels('height');
-            if (!width || !height)
-                return;
-
-            var element = host;
-            while (element instanceof Element) {
-                if (element.style.width == width && element.style.height == height)
-                    element.style.display = 'none';
-                element = element.parentNode;
-            }
-        }
-    };
-
-    Object.defineProperty(PluginPlaceholderElementPrototype, 'message', {
-        get: function() { return this.messageElement.textContent; },
-        set: function(message) { this.messageElement.textContent = message; },
-    });
-
-    Object.defineProperty(PluginPlaceholderElementPrototype, 'closeable', {
-        get: function() { return this.closeButton.style.display != 'none'; },
-        set: function(closeable) { this.closeButton.style.display = closeable ? '' : 'none'; },
-    });
-});
+/**
+ * This is a placeholder to create the
+ * IDR_PRIVATE_SCRIPT_PLUGINPLACEHOLDERELEMENT_JS resource.
+ *
+ * It will be replaced by a complete file in:
+ *   https://codereview.chromium.org/522783002/
+ */