Change PPDCache to use a path inside the per-user profile.

chrome/browser/ui/webui/settings/chromeos/cups_printers_handler.cc

 // Copyright 2016 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/browser/ui/webui/settings/chromeos/cups_printers_handler.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
+#include "base/files/file_util.h"
 #include "base/memory/ptr_util.h"
 #include "base/path_service.h"
 #include "base/strings/string_util.h"
 #include "base/threading/sequenced_task_runner_handle.h"
 #include "base/values.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chromeos/printing/printer_pref_manager_factory.h"
 #include "chrome/browser/download/download_prefs.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser_finder.h"
@@ skipping 51 matching lines @@
 
   return printer_info;
 }
 
 }  // namespace
 
 CupsPrintersHandler::CupsPrintersHandler(content::WebUI* webui)
     : printer_discoverer_(nullptr),
       profile_(Profile::FromWebUI(webui)),
       weak_factory_(this) {
-  base::FilePath ppd_cache_path;
-  CHECK(
-      base::PathService::Get(chrome::DIR_CHROMEOS_PPD_CACHE, &ppd_cache_path));
+  base::FilePath ppd_cache_path = profile_->GetPath().Append("PPDCache");

[sky, 2016/11/15 22:18:37]

I think you need FILE_PATH_LITERAL here, or AppendASCII, although maybe not as
this code is chromeos only.

[Carlson, 2016/11/15 22:25:12]

It is chromeos-specific, but no harm in being orthogonal, so done.

+  if (!base::PathExists(ppd_cache_path) &&
+      !base::CreateDirectory(ppd_cache_path)) {
+    LOG(ERROR) << "Failed to create ppd cache directory "
+               << ppd_cache_path.MaybeAsASCII();
+  }
   ppd_provider_ = chromeos::printing::PpdProvider::Create(
       google_apis::GetAPIKey(), g_browser_process->system_request_context(),
       content::BrowserThread::GetTaskRunnerForThread(
           content::BrowserThread::FILE),
       chromeos::printing::PpdCache::Create(ppd_cache_path));
 }
 
 CupsPrintersHandler::~CupsPrintersHandler() {}
 
 void CupsPrintersHandler::RegisterMessages() {
@@ skipping 291 matching lines @@
                          *printers_list);
 }
 
 void CupsPrintersHandler::OnDiscoveryDone() {
   CallJavascriptFunction("cr.webUIListenerCallback",
                          base::StringValue("on-printer-discovery-done"));
 }
 
 }  // namespace settings
 }  // namespace chromeos