Add color metadata info to VideoDecoderConfig.

ui/gfx/color_space.h

 // Copyright (c) 2012 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 UI_GFX_COLOR_SPACE_H_
 #define UI_GFX_COLOR_SPACE_H_
 
 #include <stdint.h>
 
 #include "base/gtest_prod_util.h"
@@ skipping 98 matching lines @@
     BT2020_CL = 10,
     YDZDX = 11,
 
     LAST_STANDARD_VALUE = YDZDX,
 
     // Chrome-specific values start at 1000
     UNKNOWN = 1000,
     LAST = UNKNOWN,
   };
 
-  // The h264 spec declares this as bool, so only the the first two values
-  // correspond to the h264 spec. Chrome-specific values can start at 2.
-  // We use an enum instead of a bool becuase different bit depths may have
-  // different definitions of what "limited" means.
+  // This corresponds to the WebM Range enum which is part of WebM color data
+  // (see http://www.webmproject.org/docs/container/#Range).
+  // H.264 only uses a bool, which corresponds to the LIMITED/FULL values.
+  // Chrome-specific values start at 1000.
   enum class RangeID : int8_t {
-    FULL = 0,
+    // Range is not explicitly specified / unknown.
+    UNSPECIFIED = 0,
+
+    // Limited Rec. 709 color range with RGB values ranging from 16 to 235.
     LIMITED = 1,
 
-    LAST = LIMITED
+    // Full RGB color range with RGB valees from 0 to 255.
+    FULL = 2,
+
+    // Range is defined by TransferID/MatrixID.
+    DERIVED = 3,
+
+    LAST = DERIVED
   };
 
   ColorSpace();
   ColorSpace(PrimaryID primaries,
              TransferID transfer,
              MatrixID matrix,
              RangeID full_range);
   ColorSpace(int primaries, int transfer, int matrix, RangeID full_range);
 
   static PrimaryID PrimaryIDFromInt(int primary_id);
@@ skipping 30 matching lines @@
 
   friend class ICCProfile;
   friend class ColorSpaceToColorSpaceTransform;
   friend struct IPC::ParamTraits<gfx::ColorSpace>;
   FRIEND_TEST_ALL_PREFIXES(SimpleColorSpace, GetColorSpace);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_COLOR_SPACE_H_