Deprecate media::ColorSpace and VideoFrameMetadata::COLOR_SPACE

Bug: 754986
Change-Id: I66fafcea2b851e371473893bd23fe36b17354069
Reviewed-on: https://chromium-review.googlesource.com/999041Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Fredrik Hubinette <hubbe@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548655}

media/base/video_frame_metadata.h

@@ -34,6 +34,7 @@ class MEDIA_EXPORT VideoFrameMetadata {
 
     // Some VideoFrames have an indication of the color space used.  Use
     // GetInteger()/SetInteger() and ColorSpace enumeration.
+    // Reading this metadata is deprecated, use frame->ColorSpace() instead.
     COLOR_SPACE,
 
     // Indicates that this frame must be copied to a new texture before use,

media/base/video_types.h

@@ -73,6 +73,7 @@ enum VideoPixelFormat {
 
 // Color space or color range used for the pixels.
 // Logged to UMA, so never reuse values. Leave gaps if necessary.
+// This enum is deprecated, use VideoColorSpace or gfx::ColorSpace instead.
 enum ColorSpace {
   COLOR_SPACE_UNSPECIFIED = 0,  // In general this is Rec601.
   // The JPEG color space is the combination of Rec.601 and full range colors