Clean up plug-in placeholders:

chrome/renderer/plugins/plugin_placeholder.cc

Index: chrome/renderer/plugins/plugin_placeholder.cc
diff --git a/chrome/renderer/plugins/plugin_placeholder.cc b/chrome/renderer/plugins/plugin_placeholder.cc
new file mode 100644
index 0000000000000000000000000000000000000000..281f3dc09aa879f77bbcaadb12bd09e5f1940cf4
--- /dev/null
+++ b/chrome/renderer/plugins/plugin_placeholder.cc
@@ -0,0 +1,123 @@
+// Copyright (c) 2011 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.
+
+#include "chrome/renderer/plugins/plugin_placeholder.h"
+
+#include "base/string_util.h"
+#include "chrome/renderer/plugins/plugin_uma.h"
+#include "content/public/renderer/render_view.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebData.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebDocument.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebElement.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebFrame.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebPluginContainer.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebRegularExpression.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebTextCaseSensitivity.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebView.h"
+
+using WebKit::WebElement;
+using WebKit::WebFrame;
+using WebKit::WebNode;
+using WebKit::WebPlugin;
+using WebKit::WebPluginContainer;
+using WebKit::WebPluginParams;
+using WebKit::WebRegularExpression;
+using WebKit::WebString;
+using webkit::npapi::WebViewPlugin;
+using webkit::WebPluginInfo;
+
+static const char* const kPluginPlaceholderDataURL =
+    "chrome://pluginplaceholderdata/";
+
+PluginPlaceholder::PluginPlaceholder(content::RenderView* render_view,
+                                     WebFrame* frame,
+                                     const WebPluginParams& params,
+                                     const std::string& html_data)
+    : content::RenderViewObserver(render_view),
+      frame_(frame),
+      plugin_params_(params),
+      plugin_(WebViewPlugin::Create(
+          this, render_view->GetWebkitPreferences(), html_data,
+          GURL(kPluginPlaceholderDataURL))) {
+}
+
+PluginPlaceholder::~PluginPlaceholder() {
+}
+
+void PluginPlaceholder::BindWebFrame(WebFrame* frame) {
+  BindToJavascript(frame, "plugin");
+}
+
+void PluginPlaceholder::LoadPlugin(const WebPluginInfo& plugin_info) {
+  CHECK(plugin_);
+  WebPluginContainer* container = plugin_->container();
+  WebPlugin* new_plugin =
+      render_view()->CreatePlugin(frame_, plugin_info, plugin_params_);
+  if (new_plugin && new_plugin->initialize(container)) {
+    plugin_->RestoreTitleText();
+    container->setPlugin(new_plugin);
+    container->invalidate();
+    container->reportGeometry();
+    plugin_->ReplayReceivedData(new_plugin);
+    plugin_->destroy();
+  } else {
+    MissingPluginReporter::GetInstance()->ReportPluginMissing(
+        plugin_params_.mimeType.utf8(),
+        plugin_params_.url);
+  }
+}
+
+void PluginPlaceholder::HidePlugin() {
+  CHECK(plugin_);
+  WebPluginContainer* container = plugin_->container();
+  WebElement element = container->element();
+  element.setAttribute("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 heurisitc 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 fasle positives.
+  // 4) Seems to have a good / low false negative rate at this time.
+  if (element.hasAttribute("width") && element.hasAttribute("height")) {
+    std::string width_str("width:[\\s]*");
+    width_str += element.getAttribute("width").utf8().data();
+    if (EndsWith(width_str, "px", false)) {
+      width_str = width_str.substr(0, width_str.length() - 2);
+    }
+    TrimWhitespace(width_str, TRIM_TRAILING, &width_str);
+    width_str += "[\\s]*px";
+    WebRegularExpression width_regex(WebString::fromUTF8(width_str.c_str()),
+                                     WebKit::WebTextCaseSensitive);
+    std::string height_str("height:[\\s]*");
+    height_str += element.getAttribute("height").utf8().data();
+    if (EndsWith(height_str, "px", false)) {
+      height_str = height_str.substr(0, height_str.length() - 2);
+    }
+    TrimWhitespace(height_str, TRIM_TRAILING, &height_str);
+    height_str += "[\\s]*px";
+    WebRegularExpression height_regex(WebString::fromUTF8(height_str.c_str()),
+                                      WebKit::WebTextCaseSensitive);
+    WebNode parent = element;
+    while (!parent.parentNode().isNull()) {
+      parent = parent.parentNode();
+      if (!parent.isElementNode())
+        continue;
+      element = parent.toConst<WebElement>();
+      if (element.hasAttribute("style")) {
+        WebString style_str = element.getAttribute("style");
+        if (width_regex.match(style_str) >= 0 &&
+            height_regex.match(style_str) >= 0)
+          element.setAttribute("style", "display: none;");
+      }
+    }
+  }
+}
+
+void PluginPlaceholder::WillDestroyPlugin() {
+  delete this;
+}