Adding support for mount point different from removable devices to MountLibrary

chrome/common/extensions/api/extension_api.json

 [
   {
     "namespace": "extension",
     "unprivileged": true,
     "types": [
       {
         "id": "MessageSender",
         "type": "object",
         "description": "An object containing information about the script context that sent a message or request.",
         "properties": {
@@ skipping 5158 matching lines @@
             "type": "boolean",
             "description": "Flag that specifies if volume is mounted in read-only mode."
           },
           "totalSizeKB": {
             "type": "integer",
             "description": "Total disk volume size in KBs"
           }
         }
       },
       {
+        "id": "MountPointInfo",
+        "type": "object",
+        "description": "Mounted point information.",
+        "properties": {
+          "mountPath": {
+            "type": "string",
+            "description": "Disk volume mount point path. The value corresponds to its Entry.fullPath in File API."
+          },
+          "sourcePath": {
+            "type": "string",
+            "description": "The path to the mounted resource. Either a device path, or a path to an archive file."
+          },
+          "mountType": {
+            "type": "string",
+            "enum": ["device", "file", "network"],
+            "description": "Type of the mount."
+          }
+        }
+      },
+      {
         "id": "VolumeMetadata",
         "type": "object",
         "description": "Mounted disk volume metadata.",
         "properties": {
           "mountPath": {
             "type": "string",
             "description": "Disk volume mount point path."
           },
           "devicePath": {
             "type": "string",
@@ skipping 52 matching lines @@
             "enum": ["added", "removed"],
             "description": "Event type that tells listeners which disk volume even was raised."
           },
           "volumeInfo": {
             "$ref": "VolumeInfo",
             "description":"Volume information that this mount event applies to."
           }
         }
       },
       {
+        "id": "MountCompletedEvent",
+        "type": "object",
+        "description": "Payload data for mount event.",
+        "properties": {
+          "eventType": {
+            "type": "string",
+            "enum": ["mount", "unmount"],
+            "description": "Is the event raised for mounting or unmounting."
+          },
+          "status": {
+            "type": "string",
+            "enum": ["success", "error_unknown", "error_internal",
+                     "error_unknown_filesystem", "error_unsuported_filesystem",
+                     "error_invalid_archive", "error_libcros_missing"],
+            "description": "Event type that tells listeners if mount was successfull or an error occurred. It also specifies the error."
+          },
+          "sourcePath": {
+            "type": "string",
+            "description": "Path that has been mounted."
+          },
+          "mountPath": {
+            "type": "string",
+            "optional": true,
+            "description": "Path that sourcePath was mounted to."
+          },
+          "mountType": {
+            "type": "string",
+            "enum": ["device", "file", "network"],
+            "description": "Type of the mount."
+          }
+        }
+      },
+      {
         "id": "FileWatchEvent",
         "type": "object",
         "description": "Payload data for disk mount / unmount event.",
         "properties": {
           "eventType": {
             "type": "string",
             "enum": ["changed", "error"],
             "description": "Specifies type of event that is raised."
           },
           "fileUrl": {
@@ skipping 213 matching lines @@
                 "name" : "volumeMetadata",
                 "$ref": "VolumeMetadata",
                 "optional": "true",
                 "description": "A requested metadata dictionary object. null if there is no volume with selected devicePath"
               }
             ]
           }
         ]
       },
       {
-        "name": "unmountVolume",
-        "description": "Unmounts specified volume",
+        "name": "addMount",
+        "type": "function",
+        "description": "Mount a resource or a file.",
         "parameters": [
           {
-            "name": "devicePath",
+            "name": "source",
             "type": "string",
-            "description": "Device path of the volume."
+            "description": "Mount point source. For compressed files it is relative file path within external file system"
+          },
+          {
+            "name": "mountType",
+            "type": "string",
+            "enum": ["device", "file", "network"],
+            "description": "Mount point type. 'file' for compressed files"
+          },
+          {
+            "name": "options",
+            "type": "object",
+            "description": "Name/value pairs for source specific options",
+            "optional": "true"
           }
         ]
+      },
+      {
+        "name": "removeMount",
+        "description": "Unmounts a mounted resource.",
+        "parameters": [
+          {
+            "name": "mountPath",
+            "type": "string",
+            "description": "A path of the mount."
+          }
+        ]
+      },
+      {
+        "name": "getMountPoints",
+        "description": "Get the list of mount points.",
+        "returns": {
+          "type": "object",
+          "items": {"$ref": "MountPointInfo"},
+          "description": "The dictionary with mount point paths as elements and MountPointInfo as values."
+        }
       }
     ],
     "events": [
       {
         "name": "onDiskChanged",
         "type": "function",
         "description": "Fired when disk mount/unmount event is detected.",
         "parameters": [
           {
             "$ref": "MountEvent",
             "name": "event",
             "description": "Mount event information."
           }
         ]
       },
       {
+        "name": "onMountCompleted",
+        "type": "function",
+        "description": "Fired when mount event is detected.",
+        "parameters": [
+          {
+            "$ref": "MountCompletedEvent",
+            "name": "event",
+            "description": "MountCompleted event information."
+          }
+        ]
+      },
+      {
         "name": "onFileChanged",
         "type": "function",
         "description": "Fired when watched file change event is detected.",
         "parameters": [
           {
             "$ref": "FileWatchEvent",
             "name": "event",
             "description": "File watch event information."
           }
         ]
@@ skipping 859 matching lines @@
             "name": "details",
             "properties": {
               "extensionId": {
                 "type": "string",
                 "optional": true,
                 "description": "An optional id to do notifications for an app other than the calling app. This is just to allow prototyping with an extension that sends notifications on behalf of apps that don't support notifications yet; this will be removed before the API becomes stable."
               },
               "title": {
                 "type": "string",
                 "optional": true,
-                "description": "The title of the notification."  
+                "description": "The title of the notification."
               },
               "bodyText": {
                 "type": "string",
                 "optional": true,
                 "description": "The text content of the notification."
               },
               "linkUrl": {
                 "type": "string",
                 "optional": true,
                 "description": "The URL for an optional link to show along with the notification. If you specify a linkUrl, you must also specify a value for linkText."
@@ skipping 146 matching lines @@
                 "description": "A string result code. The value is non-empty on success only in tests.",
                 "optional": "true"
               }
             ]
           }
         ]
       }
     ]
   }
 ]