Add the partial screen magnifier to Chrome OS.

chrome/browser/ui/ash/ash_init.cc

Index: chrome/browser/ui/ash/ash_init.cc
diff --git a/chrome/browser/ui/ash/ash_init.cc b/chrome/browser/ui/ash/ash_init.cc
index 5b552177f039be0a0dbb4f391475738584f9c343..ec5f3b69fe1be843b0c0697701ed72558843a2ea 100644
--- a/chrome/browser/ui/ash/ash_init.cc
+++ b/chrome/browser/ui/ash/ash_init.cc
@@ -8,6 +8,7 @@
 #include "ash/ash_switches.h"
 #include "ash/high_contrast/high_contrast_controller.h"
 #include "ash/magnifier/magnification_controller.h"
+#include "ash/magnifier/partial_magnification_controller.h"
 #include "ash/shell.h"
 #include "ash/wm/event_rewriter_event_filter.h"
 #include "ash/wm/property_util.h"
@@ -89,8 +90,12 @@ void OpenAsh() {
   ash::Shell::GetInstance()->high_contrast_controller()->SetEnabled(
       chromeos::accessibility::IsHighContrastEnabled());
 
+  chromeos::accessibility::ScreenMagnifierType magnifier_type =
+      chromeos::accessibility::GetScreenMagnifierType();
   ash::Shell::GetInstance()->magnification_controller()->SetEnabled(
-      chromeos::accessibility::IsScreenMagnifierEnabled());
+      magnifier_type == chromeos::accessibility::MagnifierFull);
+  ash::Shell::GetInstance()->partial_magnification_controller()->SetEnabled(
+      magnifier_type == chromeos::accessibility::MagnifierPartial);
 
   if (!CommandLine::ForCurrentProcess()->HasSwitch(
       switches::kDisableZeroBrowsersOpenForTests)) {