Adds views::corewm::WMState to install common state

ash/shell/content_client/shell_browser_main_parts.cc

Index: ash/shell/content_client/shell_browser_main_parts.cc
diff --git a/ash/shell/content_client/shell_browser_main_parts.cc b/ash/shell/content_client/shell_browser_main_parts.cc
index 70d523efc4bb7238446125892842a1d8622f38f3..2e4a4c402003948724da9850239a43e095e9252a 100644
--- a/ash/shell/content_client/shell_browser_main_parts.cc
+++ b/ash/shell/content_client/shell_browser_main_parts.cc
@@ -29,6 +29,7 @@
 #include "ui/compositor/compositor.h"
 #include "ui/gfx/screen.h"
 #include "ui/message_center/message_center.h"
+#include "ui/views/corewm/wm_state.h"
 #include "ui/views/focus/accelerator_handler.h"
 #include "ui/views/test/test_views_delegate.h"
 
@@ -97,6 +98,10 @@ void ShellBrowserMainParts::PostMainMessageLoopStart() {
 #endif
 }
 
+void ShellBrowserMainParts::ToolkitInitialized() {
+  wm_state_.reset(new views::corewm::WMState);
+}
+
 void ShellBrowserMainParts::PreMainMessageLoopRun() {
   net_log_.reset(new content::ShellNetLog());
   browser_context_.reset(new content::ShellBrowserContext(