Add chrome.webcamPrivate idl

chrome/common/extensions/api/webcam_private.idl

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Webcam Private API.
+namespace webcamPrivate {
+  dictionary WebcamParameters {
+    DOMString sourceId;
+    double? value;

[not at google - send to devlin, 2014/03/20 11:24:51]

what do these mean?

+  };
+
+  callback SuccessCallback = void(boolean success);

[not at google - send to devlin, 2014/03/20 11:24:51]

typically success is implicit so long as it doesn't fail, and failure is
communicated via chrome.runtime.lastError.

+  callback PZTCallback = void(boolean success,
+                              double pan,
+                              double zoom,
+                              double tilt);
+
+  interface Functions {
+    static void resetPan(WebcamParameters params,
+                         optional SuccessCallback callback);
+    static void resetZoom(WebcamParameters params,
+                          optional SuccessCallback callback);
+    static void resetTilt(WebcamParameters params,
+                          optional SuccessCallback callback);
+
+    static void setPan(WebcamParameters params,
+                       optional SuccessCallback callback);
+    static void setZoom(WebcamParameters params,
+                        optional SuccessCallback callback);
+    static void setTilt(WebcamParameters params,
+                        optional SuccessCallback callback);
+
+    static void getCurrentPanZoomTilt(DOMString sourceId, PZTCallback callback);

[not at google - send to devlin, 2014/03/20 11:24:51]

you could also consider

dictionary WebcamParameters { ... }

dictionary WebcamConfiguration {
  optional double pan;
  optional double zoom;
  optional double tilt;
}

static void set(WebcamParameters, WebcamConfiguration, SuccessCallback);
static void get(WebcamParameters, WebcamConfigurationCallback);
static void reset(WebcamParameters, SuccessCallback);

+  };
+};
+