Implement the file chooser as a new resource "host"

ppapi/proxy/file_chooser_resource.h

Index: ppapi/proxy/file_chooser_resource.h
diff --git a/ppapi/proxy/file_chooser_resource.h b/ppapi/proxy/file_chooser_resource.h
new file mode 100644
index 0000000000000000000000000000000000000000..b1930fe6f81fe975cb28016e10740f8a7340c372
--- /dev/null
+++ b/ppapi/proxy/file_chooser_resource.h
@@ -0,0 +1,89 @@
+// 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 PPAPI_PROXY_FILE_CHOOSER_RESOURCE_H_
+#define PPAPI_PROXY_FILE_CHOOSER_RESOURCE_H_
+
+#include <queue>
+#include <string>
+#include <vector>
+
+#include "ppapi/proxy/plugin_resource.h"
+#include "ppapi/proxy/ppapi_proxy_export.h"
+#include "ppapi/shared_impl/array_writer.h"
+#include "ppapi/shared_impl/tracked_callback.h"
+#include "ppapi/thunk/ppb_file_chooser_api.h"
+
+namespace ppapi {
+
+struct PPB_FileRef_CreateInfo;
+
+namespace proxy {
+
+class PPAPI_PROXY_EXPORT FileChooserResource
+    : public PluginResource,
+      public NON_EXPORTED_BASE(thunk::PPB_FileChooser_API) {
+ public:
+  FileChooserResource(IPC::Message::Sender* sender,
+                      PP_Instance instance,
+                      PP_FileChooserMode_Dev mode,
+                      const std::string& accept_types);
+  virtual ~FileChooserResource();
+
+  // Resource overrides.
+  virtual thunk::PPB_FileChooser_API* AsPPB_FileChooser_API() OVERRIDE;
+
+  // PPB_FileChooser_API.
+  virtual int32_t Show(const PP_ArrayOutput& output,
+                       const PP_CompletionCallback& callback) OVERRIDE;
+  virtual int32_t ShowWithoutUserGesture(
+      PP_Bool save_as,
+      PP_Var suggested_file_name,
+      const PP_ArrayOutput& output,
+      const PP_CompletionCallback& callback) OVERRIDE;
+  virtual int32_t Show0_5(const PP_CompletionCallback& callback) OVERRIDE;
+  virtual PP_Resource GetNextChosenFile() OVERRIDE;
+  virtual int32_t ShowWithoutUserGesture0_5(
+      PP_Bool save_as,
+      PP_Var suggested_file_name,
+      const PP_CompletionCallback& callback) OVERRIDE;
+
+  // Parses the accept string into the given vector.
+  static void PopulateAcceptTypes(const std::string& input,
+                                  std::vector<std::string>* output);
+
+ private:
+  // PluginResource override.
+  virtual void OnReplyReceived(int sequence,
+                               int32_t result,
+                               const IPC::Message& msg) OVERRIDE;
+
+  void OnPluginMsgShowReply(
+      const std::vector<ppapi::PPB_FileRef_CreateInfo>& chosen_files);
+
+  int32_t ShowInternal(PP_Bool save_as,
+                       const PP_Var& suggested_file_name,
+                       const PP_CompletionCallback& callback);
+
+  PP_FileChooserMode_Dev mode_;
+  std::vector<std::string> accept_types_;
+
+  // When using v0.6 of the API, contains the array output info.
+  ArrayWriter output_;
+
+  // When using v0.5 of the API, contains all files returned by the current
+  // show callback that haven't yet been given to the plugin. The plugin will
+  // repeatedly call us to get the next file, and we'll vend those out of this
+  // queue, removing them when ownership has transferred to the plugin.
+  std::queue<PP_Resource> file_queue_;
+
+  scoped_refptr<TrackedCallback> callback_;
+
+  DISALLOW_COPY_AND_ASSIGN(FileChooserResource);
+};
+
+}  // namespace proxy
+}  // namespace ppapi
+
+#endif  // PPAPI_PROXY_FILE_CHOOSER_RESOURCE_H_