Add the partial screen magnifier to Chrome OS.

chrome/browser/ui/webui/options/browser_options_handler.cc

Index: chrome/browser/ui/webui/options/browser_options_handler.cc
diff --git a/chrome/browser/ui/webui/options/browser_options_handler.cc b/chrome/browser/ui/webui/options/browser_options_handler.cc
index 67e5116e5cfb18f98c713724c05984f29b331b8f..b889763c1b54afbe6177cfe0f80ec9d1ba9ad740 100644
--- a/chrome/browser/ui/webui/options/browser_options_handler.cc
+++ b/chrome/browser/ui/webui/options/browser_options_handler.cc
@@ -113,6 +113,12 @@ using content::UserMetricsAction;
 
 namespace options {
 
+namespace {
+const char kScreenMagnifierOff[] = "off";
+const char kScreenMagnifierFull[] = "full";
+const char kScreenMagnifierPartial[] = "partial";
+}
+
 BrowserOptionsHandler::BrowserOptionsHandler()
     : template_url_service_(NULL),
       ALLOW_THIS_IN_INITIALIZER_LIST(weak_ptr_factory_for_file_(this)),
@@ -283,6 +289,12 @@ void BrowserOptionsHandler::GetLocalizedValues(DictionaryValue* values) {
       IDS_OPTIONS_SETTINGS_ACCESSIBILITY_HIGH_CONTRAST_DESCRIPTION },
     { "accessibilityScreenMagnifier",
       IDS_OPTIONS_SETTINGS_ACCESSIBILITY_SCREEN_MAGNIFIER_DESCRIPTION },
+    { "accessibilityScreenMagnifierOff",
+      IDS_OPTIONS_SETTINGS_ACCESSIBILITY_SCREEN_MAGNIFIER_OFF },
+    { "accessibilityScreenMagnifierFull",
+      IDS_OPTIONS_SETTINGS_ACCESSIBILITY_SCREEN_MAGNIFIER_FULL },
+    { "accessibilityScreenMagnifierPartial",
+      IDS_OPTIONS_SETTINGS_ACCESSIBILITY_SCREEN_MAGNIFIER_PARTIAL },
     { "accessibilitySpokenFeedback",
       IDS_OPTIONS_SETTINGS_ACCESSIBILITY_DESCRIPTION },
     { "accessibilityTitle",
@@ -1253,10 +1265,18 @@ void BrowserOptionsHandler::HighContrastChangeCallback(const ListValue* args) {
 
 void BrowserOptionsHandler::ScreenMagnifierChangeCallback(
     const ListValue* args) {
-  bool enabled = false;
-  args->GetBoolean(0, &enabled);
+  std::string type_name;
+  args->GetString(0, &type_name);
+
+  chromeos::accessibility::ScreenMagnifierType type =
+      chromeos::accessibility::MagnifierNone;
 
-  chromeos::accessibility::EnableScreenMagnifier(enabled);
+  if (type_name == kScreenMagnifierFull)
+    type = chromeos::accessibility::MagnifierFull;
+  else if (type_name == kScreenMagnifierPartial)
+    type = chromeos::accessibility::MagnifierPartial;
+
+  chromeos::accessibility::SetScreenMagnifier(type);
 }
 
 void BrowserOptionsHandler::VirtualKeyboardChangeCallback(
@@ -1296,11 +1316,18 @@ void BrowserOptionsHandler::SetupAccessibilityFeatures() {
   web_ui()->CallJavascriptFunction(
       "BrowserOptions.setHighContrastCheckboxState",
       high_contrast_enabled);
-  base::FundamentalValue screen_magnifier_enabled(
-      pref_service->GetBoolean(prefs::kScreenMagnifierEnabled));
+
+  std::string type(kScreenMagnifierOff);
+  if (pref_service->GetBoolean(prefs::kScreenMagnifierEnabled))
+    type = kScreenMagnifierFull;
+  else if (pref_service->GetBoolean(prefs::kPartialScreenMagnifierEnabled))
+    type = kScreenMagnifierPartial;
+
+  base::StringValue magnifier_type(type);
   web_ui()->CallJavascriptFunction(
-      "BrowserOptions.setScreenMagnifierCheckboxState",
-      screen_magnifier_enabled);
+      "BrowserOptions.setScreenMagnifierTypeState",
+      magnifier_type);
+
   base::FundamentalValue virtual_keyboard_enabled(
       pref_service->GetBoolean(prefs::kVirtualKeyboardEnabled));
   web_ui()->CallJavascriptFunction(