Add chrome.input.ime.activate and chrome.input.ime.deactivate API

chrome/common/extensions/api/input_ime.json

Index: chrome/common/extensions/api/input_ime.json
diff --git a/chrome/common/extensions/api/input_ime.json b/chrome/common/extensions/api/input_ime.json
index ac19b70dbc44c4046bae0f4645333e34329cd372..5480c4ff49a159e242c5217a6b5fe8562a3bc08c 100644
--- a/chrome/common/extensions/api/input_ime.json
+++ b/chrome/common/extensions/api/input_ime.json
@@ -542,6 +542,36 @@
           {"type": "string", "name": "requestId", "description": "Request id of the event that was handled.  This should come from keyEvent.requestId"},
           {"type": "boolean", "name": "response", "description": "True if the keystroke was handled, false if not"}
         ]
+      },
+      {
+        "name": "activate",

[Devlin, 2016/01/13 18:22:59]

Could we instead just have one function, setActive?

[Azure Wei, 2016/01/14 14:03:48]

'setActive' is little wired since we don't have 'getActive' function. Instead,
we have 'onActivate' and 'onDeactivate' events. I think 'activate' and
'deactivate' seem more symmetric and consistent with the two events. Do we have
to change this?

[Devlin, 2016/01/15 22:06:02]

I don't really think setActive is weird, and we try to keep these APIs concise
when we can.  I have a slight preference for setActive over activate/deactivate,
but I don't feel strongly, so either way is fine.

+        "type": "function",
+        "description": "Activates the IME extension itself, so that it can receive events.",
+        "platforms": ["win", "linux"],
+        "parameters": [
+          {
+            "type": "function",
+            "name": "callback",
+            "optional": true,
+            "description": "Called when the operation completes.",
+            "parameters": []
+          }
+        ]
+      },
+      {
+        "name": "deactivate",
+        "type": "function",
+        "description": "Deactivates the IME extension itself, so that it cannot receive events.",
+        "platforms": ["win", "linux"],
+        "parameters": [
+          {
+            "type": "function",
+            "name": "callback",
+            "optional": true,
+            "description": "Called when the operation completes.",
+            "parameters": []
+          }
+        ]
       }
     ],
     "events": [