ImageCapture: wire |colorTemperature| set/get for Linux/Cros

third_party/WebKit/Source/modules/imagecapture/PhotoSettings.idl

 // Copyright 2016 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.
 
 // https://www.w3.org/TR/image-capture/#PhotoSettings
 
 [
     RuntimeEnabled=ImageCapture
 ] dictionary PhotoSettings {
     MeteringMode whiteBalanceMode;
-    // TODO(mcasas): Implement |colorTemperature| https://crbug.com/650675.
+    unsigned long colorTemperature;
     MeteringMode exposureMode;
     unsigned long exposureCompensation;
     unsigned long iso;
     boolean redEyeReduction;
     MeteringMode focusMode;
     sequence<Point2D> pointsOfInterest;
 
     // TODO(mcasas): Implement |brightness|, |contrast|, |saturation| and
     // |sharpness|, https://crbug.com/650676.
     unsigned long zoom;
     unsigned long imageHeight;
     unsigned long imageWidth;
     FillLightMode fillLightMode;
 };