Adds extension APIs of events on changing volume.

chrome/browser/extensions/extension_accessibility_api.cc

Index: chrome/browser/extensions/extension_accessibility_api.cc
diff --git a/chrome/browser/extensions/extension_accessibility_api.cc b/chrome/browser/extensions/extension_accessibility_api.cc
index f63234244ef28a7c75b38156ea18da84da7f8f8f..dec90c8a2118ae6b3108a5581700346c5b2f43ce 100644
--- a/chrome/browser/extensions/extension_accessibility_api.cc
+++ b/chrome/browser/extensions/extension_accessibility_api.cc
@@ -73,6 +73,15 @@ void ExtensionAccessibilityEventRouter::ObserveProfile(Profile* profile) {
     registrar_.Add(this,
                    chrome::NOTIFICATION_ACCESSIBILITY_MENU_CLOSED,
                    NotificationService::AllSources());
+    registrar_.Add(this,
+                   chrome::NOTIFICATION_ACCESSIBILITY_VOLUME_UP,
+                   NotificationService::AllSources());
+    registrar_.Add(this,
+                   chrome::NOTIFICATION_ACCESSIBILITY_VOLUME_DOWN,
+                   NotificationService::AllSources());
+    registrar_.Add(this,
+                   chrome::NOTIFICATION_ACCESSIBILITY_VOLUME_MUTE,
+                   NotificationService::AllSources());
   }
 }
 
@@ -102,6 +111,15 @@ void ExtensionAccessibilityEventRouter::Observe(
     case chrome::NOTIFICATION_ACCESSIBILITY_MENU_CLOSED:
       OnMenuClosed(Details<const AccessibilityMenuInfo>(details).ptr());
       break;
+    case chrome::NOTIFICATION_ACCESSIBILITY_VOLUME_UP:
+      OnVolumeUp(Details<const AccessibilityVolumeInfo>(details).ptr());
+      break;
+    case chrome::NOTIFICATION_ACCESSIBILITY_VOLUME_DOWN:
+      OnVolumeDown(Details<const AccessibilityVolumeInfo>(details).ptr());
+      break;
+    case chrome::NOTIFICATION_ACCESSIBILITY_VOLUME_MUTE:
+      OnVolumeMute(Details<const AccessibilityVolumeInfo>(details).ptr());
+      break;
     default:
       NOTREACHED();
   }
@@ -180,6 +198,24 @@ void ExtensionAccessibilityEventRouter::OnMenuClosed(
   DispatchEvent(info->profile(), keys::kOnMenuClosed, json_args);
 }
 
+void ExtensionAccessibilityEventRouter::OnVolumeUp(
+    const AccessibilityVolumeInfo* info) {
+  std::string json_args = ControlInfoToJsonString(info);
+  DispatchEvent(info->profile(), keys::kOnVolumeUp, json_args);
+}
+
+void ExtensionAccessibilityEventRouter::OnVolumeDown(
+    const AccessibilityVolumeInfo* info) {
+  std::string json_args = ControlInfoToJsonString(info);
+  DispatchEvent(info->profile(), keys::kOnVolumeDown, json_args);
+}
+
+void ExtensionAccessibilityEventRouter::OnVolumeMute(
+    const AccessibilityVolumeInfo* info) {
+  std::string json_args = ControlInfoToJsonString(info);
+  DispatchEvent(info->profile(), keys::kOnVolumeMute, json_args);
+}
+
 void ExtensionAccessibilityEventRouter::DispatchEvent(
     Profile* profile,
     const char* event_name,