Implement a prototype to render cross-site iframes in a separate process from their parent.

content/browser/plugin_service_impl.cc

 // Copyright (c) 2012 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 "content/browser/plugin_service_impl.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/file_path.h"
@@ skipping 129 matching lines @@
 void PluginServiceImpl::Init() {
   if (!plugin_list_)
     plugin_list_ = webkit::npapi::PluginList::Singleton();
 
   plugin_list_token_ = BrowserThread::GetBlockingPool()->GetSequenceToken();
   plugin_list_->set_will_load_plugins_callback(
       base::Bind(&WillLoadPluginsCallback, plugin_list_token_));
 
   RegisterPepperPlugins();
 
+  // The --site-per-process flag enables an out-of-process iframes
+  // prototype, which uses WebView for rendering. We need to register the MIME
+  // type we use with the plugin, so the renderer can instantiate it.
+  const CommandLine* command_line = CommandLine::ForCurrentProcess();
+  if (command_line->HasSwitch(switches::kSitePerProcess)) {
+    webkit::WebPluginInfo webview_plugin(
+        ASCIIToUTF16("WebView Tag"),
+        FilePath(FILE_PATH_LITERAL("")),
+        ASCIIToUTF16("1.2.3.4"),
+        ASCIIToUTF16("Browser Plugin."));
+    webview_plugin.type = webkit::WebPluginInfo::PLUGIN_TYPE_NPAPI;
+    webkit::WebPluginMimeType webview_plugin_mime_type;
+    webview_plugin_mime_type.mime_type = "application/browser-plugin";
+    webview_plugin_mime_type.file_extensions.push_back("*");
+    webview_plugin.mime_types.push_back(webview_plugin_mime_type);
+    RegisterInternalPlugin(webview_plugin, true);
+  }
+
   GetContentClient()->AddNPAPIPlugins(plugin_list_);
 
   // Load any specified on the command line as well.
-  const CommandLine* command_line = CommandLine::ForCurrentProcess();
   FilePath path = command_line->GetSwitchValuePath(switches::kLoadPlugin);
   if (!path.empty())
     AddExtraPluginPath(path);
   path = command_line->GetSwitchValuePath(switches::kExtraPluginDir);
   if (!path.empty())
     plugin_list_->AddExtraPluginDir(path);
 }
 
 void PluginServiceImpl::StartWatchingPlugins() {
   // Start watching for changes in the plugin list. This means watching
@@ skipping 539 matching lines @@
 void PluginServiceImpl::GetInternalPlugins(
     std::vector<webkit::WebPluginInfo>* plugins) {
   plugin_list_->GetInternalPlugins(plugins);
 }
 
 webkit::npapi::PluginList* PluginServiceImpl::GetPluginList() {
   return plugin_list_;
 }
 
 }  // namespace content