Create an API around UtilityProcessHost and use that from chrome.

content/browser/plugin_loader_posix.h

 // 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.
 
 #ifndef CONTENT_BROWSER_PLUGIN_LOADER_POSIX_H_
 #define CONTENT_BROWSER_PLUGIN_LOADER_POSIX_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
+#include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
 #include "base/time.h"
 #include "content/browser/plugin_service_impl.h"
-#include "content/browser/utility_process_host.h"
+#include "content/public/browser/utility_process_host_client.h"
 #include "ipc/ipc_message.h"
 #include "webkit/plugins/webplugininfo.h"
 
-class FilePath;
-class UtilityProcessHost;
-
 namespace base {
 class MessageLoopProxy;
 }
 
+namespace content {
+class UtilityProcessHost;
+}
+
 // This class is responsible for managing the out-of-process plugin loading on
 // POSIX systems. It primarily lives on the IO thread, but has a brief stay on
 // the FILE thread to iterate over plugin directories when it is first
 // constructed.
 //
 // The following is the algorithm used to load plugins:
 // 1. This asks the PluginList for the list of all potential plugins to attempt
 //    to load. This is referred to as the canonical list.
 // 2. The child process this hosts is forked and the canonical list is sent to
 //    it.
 // 3. The child process iterates over the canonical list, attempting to load
 //    each plugin in the order specified by the list. It sends an IPC message
 //    to the browser after each load, indicating success or failure. The two
 //    processes synchronize the position in the vector that will be used to
 //    attempt to load the next plugin.
 // 4. If the child dies during this process, the host forks another child and
 //    resumes loading at the position past the plugin that it just attempted to
 //    load, bypassing the problematic plugin.
 // 5. This algorithm continues until the canonical list has been walked to the
 //    end, after which the list of loaded plugins is set on the PluginList and
 //    the completion callback is run.
-class CONTENT_EXPORT PluginLoaderPosix : public UtilityProcessHost::Client,
-                                                IPC::Message::Sender {
+class CONTENT_EXPORT PluginLoaderPosix
+    : public NON_EXPORTED_BASE(content::UtilityProcessHostClient),
+      public IPC::Message::Sender {
  public:
   PluginLoaderPosix();
 
   // Must be called from the IO thread.
   void LoadPlugins(
       scoped_refptr<base::MessageLoopProxy> target_loop,
       const content::PluginService::GetPluginsCallback& callback);
 
-  // UtilityProcessHost::Client:
+  // UtilityProcessHostClient:
   virtual void OnProcessCrashed(int exit_code) OVERRIDE;
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
 
   // IPC::Message::Sender:
   virtual bool Send(IPC::Message* msg) OVERRIDE;
 
  private:
   struct PendingCallback {
     PendingCallback(scoped_refptr<base::MessageLoopProxy> target_loop,
                     const content::PluginService::GetPluginsCallback& callback);
@@ skipping 18 matching lines @@
   // Checks if the plugin path is an internal plugin, and, if it is, adds it to
   // |loaded_plugins_|.
   bool MaybeAddInternalPlugin(const FilePath& plugin_path);
 
   // Runs all the registered callbacks on each's target loop if the condition
   // for ending the load process is done (i.e. the |next_load_index_| is outside
   // the range of the |canonical_list_|).
   bool MaybeRunPendingCallbacks();
 
   // The process host for which this is a client.
-  base::WeakPtr<UtilityProcessHost> process_host_;
+  base::WeakPtr<content::UtilityProcessHost> process_host_;
 
   // A list of paths to plugins which will be loaded by the utility process, in
   // the order specified by this vector.
   std::vector<FilePath> canonical_list_;
 
   // The index in |canonical_list_| of the plugin that the child process will
   // attempt to load next.
   size_t next_load_index_;
 
   // Internal plugins that have been registered at the time of loading.
   std::vector<webkit::WebPluginInfo> internal_plugins_;
 
   // A vector of plugins that have been loaded successfully.
   std::vector<webkit::WebPluginInfo> loaded_plugins_;
 
   // The callback and message loop on which the callback will be run when the
   // plugin loading process has been completed.
   std::vector<PendingCallback> callbacks_;
 
   // The time at which plugin loading started.
   base::TimeTicks load_start_time_;
 
   friend class MockPluginLoaderPosix;
   DISALLOW_COPY_AND_ASSIGN(PluginLoaderPosix);
 };
 
 #endif  // CONTENT_BROWSER_PLUGIN_LOADER_POSIX_H_