Revert of Remove remote tree host and some related input and metro_driver code

ui/shell_dialogs/select_file_dialog_win.cc

Index: ui/shell_dialogs/select_file_dialog_win.cc
diff --git a/ui/shell_dialogs/select_file_dialog_win.cc b/ui/shell_dialogs/select_file_dialog_win.cc
index 4cd8896b02515ba9edc7e3cb332d9324247ffa1c..40215a344fee59fc74d0d75987bfd0e974dbb43a 100644
--- a/ui/shell_dialogs/select_file_dialog_win.cc
+++ b/ui/shell_dialogs/select_file_dialog_win.cc
@@ -30,6 +30,7 @@
 #include "ui/shell_dialogs/base_shell_dialog_win.h"
 #include "ui/shell_dialogs/shell_dialogs_delegate.h"
 #include "ui/strings/grit/ui_strings.h"
+#include "win8/viewer/metro_viewer_process_host.h"
 
 namespace {
 
@@ -327,6 +328,59 @@
     void* params) {
   has_multiple_file_type_choices_ =
       file_types ? file_types->extensions.size() > 1 : true;
+  // If the owning_window passed in is in metro then we need to forward the
+  // file open/save operations to metro.
+  if (GetShellDialogsDelegate() &&
+      GetShellDialogsDelegate()->IsWindowInMetro(owning_window)) {
+    if (type == SELECT_SAVEAS_FILE) {
+      win8::MetroViewerProcessHost::HandleSaveFile(
+          title,
+          default_path,
+          GetFilterForFileTypes(file_types),
+          file_type_index,
+          default_extension,
+          base::Bind(&ui::SelectFileDialog::Listener::FileSelected,
+                     base::Unretained(listener_)),
+          base::Bind(&ui::SelectFileDialog::Listener::FileSelectionCanceled,
+                     base::Unretained(listener_)));
+      return;
+    } else if (type == SELECT_OPEN_FILE) {
+      win8::MetroViewerProcessHost::HandleOpenFile(
+          title,
+          default_path,
+          GetFilterForFileTypes(file_types),
+          base::Bind(&ui::SelectFileDialog::Listener::FileSelected,
+                     base::Unretained(listener_)),
+          base::Bind(&ui::SelectFileDialog::Listener::FileSelectionCanceled,
+                     base::Unretained(listener_)));
+      return;
+    } else if (type == SELECT_OPEN_MULTI_FILE) {
+      win8::MetroViewerProcessHost::HandleOpenMultipleFiles(
+          title,
+          default_path,
+          GetFilterForFileTypes(file_types),
+          base::Bind(&ui::SelectFileDialog::Listener::MultiFilesSelected,
+                     base::Unretained(listener_)),
+          base::Bind(&ui::SelectFileDialog::Listener::FileSelectionCanceled,
+                     base::Unretained(listener_)));
+      return;
+    } else if (type == SELECT_FOLDER || type == SELECT_UPLOAD_FOLDER) {
+      base::string16 title_string = title;
+      if (type == SELECT_UPLOAD_FOLDER && title_string.empty()) {
+        // If it's for uploading don't use default dialog title to
+        // make sure we clearly tell it's for uploading.
+        title_string = l10n_util::GetStringUTF16(
+            IDS_SELECT_UPLOAD_FOLDER_DIALOG_TITLE);
+      }
+      win8::MetroViewerProcessHost::HandleSelectFolder(
+          title_string,
+          base::Bind(&ui::SelectFileDialog::Listener::FileSelected,
+                     base::Unretained(listener_)),
+          base::Bind(&ui::SelectFileDialog::Listener::FileSelectionCanceled,
+                     base::Unretained(listener_)));
+      return;
+    }
+  }
   HWND owner = owning_window && owning_window->GetRootWindow()
       ? owning_window->GetHost()->GetAcceleratedWidget() : NULL;