ImageCapture: support exposure mode configuration

media/capture/video/android/photo_capabilities.h

 // 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.
 
 #ifndef MEDIA_CAPTURE_VIDEO_ANDROID_PHOTO_CAPABILITIES_H_
 #define MEDIA_CAPTURE_VIDEO_ANDROID_PHOTO_CAPABILITIES_H_
 
 #include <jni.h>
 #include <string>
 
 #include "base/android/scoped_java_ref.h"
 
 namespace media {
 
 class PhotoCapabilities {
  public:
-  // Focus modes from Java side, equivalent to media.mojom::FocusMode.
+  // Focus modes from Java side, equivalent to media.mojom::MeteringMode, except
+  // NOT_SET, which is used to signify absence of setting configuration.
   // A Java counterpart will be generated for this enum.
   // GENERATED_JAVA_ENUM_PACKAGE: org.chromium.media
-  enum class AndroidFocusMode {
+  enum class AndroidMeteringMode {
+    NOT_SET,
     UNAVAILABLE,
     FIXED,
     SINGLE_SHOT,
     CONTINUOUS,
   };
 
   explicit PhotoCapabilities(base::android::ScopedJavaLocalRef<jobject> object);
   ~PhotoCapabilities();
 
   int getMinIso() const;
   int getMaxIso() const;
   int getCurrentIso() const;
   int getMinHeight() const;
   int getMaxHeight() const;
   int getCurrentHeight() const;
   int getMinWidth() const;
   int getMaxWidth() const;
   int getCurrentWidth() const;
   int getMinZoom() const;
   int getMaxZoom() const;
   int getCurrentZoom() const;
-  AndroidFocusMode getFocusMode() const;
+  AndroidMeteringMode getFocusMode() const;
+  AndroidMeteringMode getExposureMode() const;
 
  private:
   const base::android::ScopedJavaLocalRef<jobject> object_;
 };
 
 }  // namespace media
 
 #endif  // MEDIA_CAPTURE_VIDEO_ANDROID_PHOTO_CAPABILITIES_H_