Add support for multiple pixel formats in VideoFrameBuffer

webrtc/api/video/i420_buffer.h

Index: webrtc/api/video/i420_buffer.h
diff --git a/webrtc/api/video/i420_buffer.h b/webrtc/api/video/i420_buffer.h
index 388a3dd76903ad9e8f24a7d841f6220c2d994a21..7915a9b3afd4255399e102ed46af2fb565acaf97 100644
--- a/webrtc/api/video/i420_buffer.h
+++ b/webrtc/api/video/i420_buffer.h
@@ -20,7 +20,7 @@
 namespace webrtc {
 
 // Plain I420 buffer in standard memory.
-class I420Buffer : public VideoFrameBuffer {
+class I420Buffer : public PlanarYuvBuffer {
  public:
   static rtc::scoped_refptr<I420Buffer> Create(int width, int height);
   static rtc::scoped_refptr<I420Buffer> Create(int width,
@@ -53,9 +53,7 @@ class I420Buffer : public VideoFrameBuffer {
   // are resolved in a better way. Or in the mean time, use SetBlack.
   void InitializeData();
 
-  // TODO(nisse): Deprecated, use static method instead.

[nisse-webrtc, 2017/05/04 08:15:29]

Also deleted in cl https://codereview.webrtc.org/2854873003/ which I'm
attempting to land.

[magjed_webrtc, 2017/05/04 12:25:13]

Wops, this is a mistake from rebasing. I'm trying to not make unrelated changes.

-  void SetToBlack() { SetBlack(this); }
-
+  PixelFormat Format() const override;
   int width() const override;
   int height() const override;
   const uint8_t* DataY() const override;
@@ -66,9 +64,6 @@ class I420Buffer : public VideoFrameBuffer {
   int StrideU() const override;
   int StrideV() const override;
 
-  void* native_handle() const override;
-  rtc::scoped_refptr<VideoFrameBuffer> NativeToI420Buffer() override;
-
   uint8_t* MutableDataY();
   uint8_t* MutableDataU();
   uint8_t* MutableDataV();