[Win] Add a fast profile switcher to the Windows taskbar item.

chrome/common/chrome_switches.h

Index: chrome/common/chrome_switches.h
diff --git a/chrome/common/chrome_switches.h b/chrome/common/chrome_switches.h
index 8fbcfe6d7ca49462b104d66616d4d0a6fa39dffe..36371c127ea382c44f8df106b436bdc7e7a4aef7 100644
--- a/chrome/common/chrome_switches.h
+++ b/chrome/common/chrome_switches.h
@@ -27,6 +27,7 @@ namespace switches {
 
 // All switches in alphabetical order. The switches should be documented
 // alongside the definition of their values in the .cc file.
+extern const char kActivateExistingProfileBrowser[];
 extern const char kAllowCrossOriginAuthPrompt[];
 extern const char kAllowFileAccess[];
 extern const char kAllowHttpScreenCapture[];
@@ -338,6 +339,7 @@ extern const char kVersion[];
 extern const char kWindowPosition[];
 extern const char kWindowSize[];
 extern const char kWinHttpProxyResolver[];
+extern const char kWinJumplistAction[];
 
 #if defined(ENABLE_PLUGIN_INSTALLATION)
 extern const char kPluginsMetadataServerURL[];