Add API tests for all input.ime functions.

chrome/common/extensions/api/extension_api.json

 [
   {
     "namespace": "extension",
     "types": [
       {
         "id": "MessageSender",
         "type": "object",
         "description": "An object containing information about the script context that sent a message or request.",
         "properties": {
           "tab": {"$ref": "Tab", "optional": true, "description":"This property will <b>only</b> be present when the connection was opened from a tab or content script."},
@@ skipping 3353 matching lines @@
               "selectionStart": {
                 "description": "Position in the text that the selection starts at.",
                 "type": "integer"
               },
               "selectionEnd": {
                 "description": "Position in the text that the selection ends at.",
                 "type": "integer"
               },
               "segments": {
                 "description": "List of segments and their associated types.",
-                "type": "object",
+                "type": "array",
                 "optional": true,
-                "properties": {
-                  "start": {
-                    "description": "Index of the character to start this segment at",
-                    "type": "integer"
-                  },
-                  "end": {
-                    "description": "Index of the character to end this segment after.",
-                    "type": "integer"
-                  },
-                  "style": {
-                    "description": "How to render this segment",
-                    "enum": ["underline", "doubleUnderline"],
-                    "type": "string"
+                "items": {
+                  "type": "object",
+                  "properties": {
+                    "start": {
+                      "description": "Index of the character to start this segment at",
+                      "type": "integer"
+                    },
+                    "end": {
+                      "description": "Index of the character to end this segment after.",
+                      "type": "integer"
+                    },
+                    "style": {
+                      "description": "How to render this segment",
+                      "enum": ["underline", "doubleUnderline"],
+                      "type": "string"
+                    }
                   }
                 }
               }
             }
           },
           {
             "type": "function",
             "name": "callback",
             "optional": true,
             "description": "Called when the operation completes with a boolean indicating if the text was accepted or not. On failure, chrome.extension.lastError is set.",
@@ skipping 192 matching lines @@
                 "description": "ID of the candidate to select.",
                 "type": "integer"
               }
             }
           },
           {
             "type": "function",
             "name": "callback",
             "optional": true,
             "description": "Called when the operation completes",
-            "parameters": []
+            "parameters": [
+              {
+                "name": "success",
+                "type": "boolean"
+              }
+            ]
           }
         ]
       },
       {
         "name": "setMenuItems",
         "type": "function",
         "description": "Adds the provided menu items to the language menu when this IME is active.",
         "parameters": [
           {
             "name": "parameters",
@@ skipping 5620 matching lines @@
                   }
                 }
               }
             ]
           }
         ]
       }
     ]
   }
 ]