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

third_party/WebKit/Source/modules/imagecapture/PhotoCapabilities.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/#PhotoCapabilities
 
 enum MeteringMode {
     "none",
     "manual",
     "single-shot",
     "continuous",
 };
 
 enum FillLightMode {
     "none",
     "off",
     "auto",
     "flash",
     "torch",
 };
 
 [
     RuntimeEnabled=ImageCapture,
 ] interface PhotoCapabilities {
     readonly attribute MeteringMode whiteBalanceMode;
-    // TODO(mcasas): Implement |colorTemperature| https://crbug.com/650675.
+    readonly attribute MediaSettingsRange colorTemperature;
     readonly attribute MeteringMode exposureMode;
     readonly attribute MediaSettingsRange exposureCompensation;
     readonly attribute MediaSettingsRange iso;
     readonly attribute boolean redEyeReduction;
     readonly attribute MeteringMode focusMode;
 
     // TODO(mcasas): Implement |brightness|, |contrast|, |saturation| and
     // |sharpness|, https://crbug.com/650676.
     readonly attribute MediaSettingsRange imageHeight;
     readonly attribute MediaSettingsRange imageWidth;
     readonly attribute MediaSettingsRange zoom;
     readonly attribute FillLightMode fillLightMode;
 };