Revert of Delete webrtc::VideoFrame::CopyFrame.

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 f9dcc66827d475e72a1d1dda2dde552bb12b3af0..c10fefdbfe593e535b876f096b464b63ea4eaee3 100644
--- a/webrtc/common_video/i420_video_frame_unittest.cc
+++ b/webrtc/common_video/i420_video_frame_unittest.cc
@@ -84,6 +84,12 @@
   EXPECT_EQ(kVideoRotation_0, frame.rotation());
 }
 
+TEST(TestVideoFrame, CopiesInitialFrameWithoutCrashing) {
+  VideoFrame frame;
+  VideoFrame frame2;
+  frame2.CopyFrame(frame);
+}
+
 TEST(TestVideoFrame, WidthHeightValues) {
   VideoFrame frame(I420Buffer::Create(10, 10, 10, 14, 90),
                    webrtc::kVideoRotation_0,
@@ -96,6 +102,44 @@
   frame.set_ntp_time_ms(456);
   EXPECT_EQ(456, frame.ntp_time_ms());
   EXPECT_EQ(789, frame.render_time_ms());
+}
+
+TEST(TestVideoFrame, CopyFrame) {
+  int stride_y = 15;
+  int stride_u = 10;
+  int stride_v = 10;
+  int width = 15;
+  int height = 15;
+  // Copy frame.
+  VideoFrame small_frame;
+  const int kSizeY = 400;
+  const int kSizeU = 100;
+  const int kSizeV = 100;
+  const VideoRotation kRotation = kVideoRotation_270;
+  uint8_t buffer_y[kSizeY];
+  uint8_t buffer_u[kSizeU];
+  uint8_t buffer_v[kSizeV];
+  memset(buffer_y, 16, kSizeY);
+  memset(buffer_u, 8, kSizeU);
+  memset(buffer_v, 4, kSizeV);
+  VideoFrame big_frame;
+  big_frame.CreateFrame(buffer_y, buffer_u, buffer_v,
+                        width + 5, height + 5, stride_y + 5,
+                        stride_u, stride_v, kRotation);
+  // Frame of smaller dimensions.
+  small_frame.CopyFrame(big_frame);
+  EXPECT_TRUE(test::FramesEqual(small_frame, big_frame));
+  EXPECT_EQ(kRotation, small_frame.rotation());
+
+  // Frame of larger dimensions.
+  rtc::scoped_refptr<I420Buffer> buffer =
+      I420Buffer::Create(width, height, stride_y, stride_u, stride_v);
+  memset(buffer->MutableDataY(), 1, width * height);
+  memset(buffer->MutableDataU(), 2, ((height + 1) / 2) * stride_u);
+  memset(buffer->MutableDataV(), 3, ((height + 1) / 2) * stride_u);
+  VideoFrame other_frame(buffer, 0, 0, webrtc::kVideoRotation_0);
+  big_frame.CopyFrame(other_frame);
+  EXPECT_TRUE(test::FramesEqual(other_frame, big_frame));
 }
 
 TEST(TestVideoFrame, ShallowCopy) {