Add chrome.inputMethodPrivate.onImeMenuActivationChanged API.

chrome/common/extensions/api/input_method_private.json

Index: chrome/common/extensions/api/input_method_private.json
diff --git a/chrome/common/extensions/api/input_method_private.json b/chrome/common/extensions/api/input_method_private.json
index 69ca53ec654842dbbb8ec739138efabbd42b8d68..8da283ae203eda467319a4e62742d4e9c8fee3c8 100644
--- a/chrome/common/extensions/api/input_method_private.json
+++ b/chrome/common/extensions/api/input_method_private.json
@@ -26,7 +26,8 @@
                 "type": "object",
                 "description": "The input method config object.",
                 "properties": {
-                  "isPhysicalKeyboardAutocorrectEnabled": {"type": "boolean"}
+                  "isPhysicalKeyboardAutocorrectEnabled": {"type": "boolean"},
+                  "isImeMenuActivated": {"type": "boolean"}
                 }
               }
             ]
@@ -246,6 +247,17 @@
             }
           }
         ]
+      }, {
+        "name": "onImeMenuActivationChanged",
+        "type": "function",
+        "description": "Fired when the IME menu is activated or deactivated.",
+        "parameters": [
+          {
+            "name": "activation",
+            "type": "boolean",
+            "description": "Whether the IME menu is currently active."
+          }
+        ]
       }
     ]
   }