Initialize GPU shader disk cache on brower thread.

chrome/browser/chrome_content_browser_client.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 "chrome/browser/chrome_content_browser_client.h"
 
 #include <map>
 #include <set>
 #include <utility>
 #include <vector>
@@ skipping 2246 matching lines @@
 }
 
 base::FilePath ChromeContentBrowserClient::GetDefaultDownloadDirectory() {
   return DownloadPrefs::GetDefaultDownloadDirectory();
 }
 
 std::string ChromeContentBrowserClient::GetDefaultDownloadName() {
   return l10n_util::GetStringUTF8(IDS_DEFAULT_DOWNLOAD_FILENAME);
 }
 
+base::FilePath ChromeContentBrowserClient::GetShaderDiskCacheDirectory() {
+  base::FilePath user_data_dir;
+  PathService::Get(DIR_USER_DATA, &user_data_dir);
+  DCHECK(!user_data_dir.empty());
+  return user_data_dir.Append(FILE_PATH_LITERAL("ShaderCache"));
+}
+
 void ChromeContentBrowserClient::DidCreatePpapiPlugin(
     content::BrowserPpapiHost* browser_host) {
 #if defined(ENABLE_PLUGINS)
   ChromeContentBrowserClientPluginsPart::DidCreatePpapiPlugin(browser_host);
 #endif
 }
 
 content::BrowserPpapiHost*
     ChromeContentBrowserClient::GetExternalBrowserPpapiHost(
         int plugin_process_id) {
@@ skipping 335 matching lines @@
       switches::kDisableWebRtcEncryption,
     };
     to_command_line->CopySwitchesFrom(from_command_line,
                                       kWebRtcDevSwitchNames,
                                       arraysize(kWebRtcDevSwitchNames));
   }
 }
 #endif  // defined(ENABLE_WEBRTC)
 
 }  // namespace chrome