Added new VideoFrameBuffer methods Data[YUV]() etc.

webrtc/common_video/i420_video_frame_unittest.cc

Index: webrtc/common_video/i420_video_frame_unittest.cc
diff --git a/webrtc/common_video/i420_video_frame_unittest.cc b/webrtc/common_video/i420_video_frame_unittest.cc
index b2f59eaae8697b09f6f2627e69acdbac0fa3b47b..8368436446a261b0fd2d3cb65778e93fa974e368 100644
--- a/webrtc/common_video/i420_video_frame_unittest.cc
+++ b/webrtc/common_video/i420_video_frame_unittest.cc
@@ -258,9 +258,9 @@ TEST(TestVideoFrame, TextureInitialValues) {
 TEST(TestI420FrameBuffer, Copy) {
   rtc::scoped_refptr<I420Buffer> buf1(
       new rtc::RefCountedObject<I420Buffer>(20, 10));
-  memset(buf1->MutableData(kYPlane), 1, 200);
-  memset(buf1->MutableData(kUPlane), 2, 50);
-  memset(buf1->MutableData(kVPlane), 3, 50);
+  memset(buf1->MutableDataY(), 1, 200);
+  memset(buf1->MutableDataU(), 2, 50);
+  memset(buf1->MutableDataV(), 3, 50);
   rtc::scoped_refptr<I420Buffer> buf2 = I420Buffer::Copy(buf1);
   EXPECT_TRUE(test::FrameBufsEqual(buf1, buf2));
 }