ImageCapture: support exposure mode configuration

third_party/WebKit/Source/modules/imagecapture/PhotoCapabilities.cpp

 // 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.
 
 #include "modules/imagecapture/PhotoCapabilities.h"
 
 namespace blink {
 
-// static
-PhotoCapabilities* PhotoCapabilities::create()
+namespace {
+
+String meteringModeToString(media::mojom::blink::MeteringMode mode)
 {
-    return new PhotoCapabilities();
-}
-
-String PhotoCapabilities::focusMode() const
-{
-    switch (m_focusMode) {
-    case media::mojom::blink::FocusMode::UNAVAILABLE:
+    switch (mode) {
+    case media::mojom::blink::MeteringMode::UNAVAILABLE:
         return "unavailable";
-    case media::mojom::blink::FocusMode::MANUAL:
+    case media::mojom::blink::MeteringMode::MANUAL:
         return "manual";
-    case media::mojom::blink::FocusMode::SINGLE_SHOT:
+    case media::mojom::blink::MeteringMode::SINGLE_SHOT:
         return "single-shot";
-    case media::mojom::blink::FocusMode::CONTINUOUS:
+    case media::mojom::blink::MeteringMode::CONTINUOUS:
         return "continuous";
     default:
         NOTREACHED();
     }
     return emptyString();
 }
 
+} // anonymous namespace
+
+// static
+PhotoCapabilities* PhotoCapabilities::create()
+{
+    return new PhotoCapabilities();
+}
+
+String PhotoCapabilities::focusMode() const
+{
+    return meteringModeToString(m_focusMode);
+}
+
+String PhotoCapabilities::exposureMode() const
+{
+    return meteringModeToString(m_exposureMode);
+}
+
 DEFINE_TRACE(PhotoCapabilities)
 {
     visitor->trace(m_iso);
     visitor->trace(m_imageHeight);
     visitor->trace(m_imageWidth);
     visitor->trace(m_zoom);
 }
 
 } // namespace blink