Revert of Delete VideoFrame default constructor, and IsZeroSize method.

webrtc/common_video/i420_video_frame_unittest.cc

 /*
  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 93 matching lines @@
     EXPECT_EQ(colors[i].y, rotated.DataY()[x + y * rotated.StrideY()]);
     EXPECT_EQ(colors[i].u,
               rotated.DataU()[(x / 2) + (y / 2) * rotated.StrideU()]);
     EXPECT_EQ(colors[i].v,
               rotated.DataV()[(x / 2) + (y / 2) * rotated.StrideV()]);
   }
 }
 
 }  // namespace
 
+TEST(TestVideoFrame, InitialValues) {
+  VideoFrame frame;
+  EXPECT_TRUE(frame.IsZeroSize());
+  EXPECT_EQ(kVideoRotation_0, frame.rotation());
+}
+
 TEST(TestVideoFrame, WidthHeightValues) {
   VideoFrame frame(I420Buffer::Create(10, 10, 10, 14, 90),
                    webrtc::kVideoRotation_0,
                    789 * rtc::kNumMicrosecsPerMillisec);
   const int valid_value = 10;
   EXPECT_EQ(valid_value, frame.width());
   EXPECT_EQ(valid_value, frame.height());
   frame.set_timestamp(123u);
   EXPECT_EQ(123u, frame.timestamp());
   frame.set_ntp_time_ms(456);
@@ skipping 160 matching lines @@
   CheckRotate(640, 480, GetParam(), *rotated_buffer);
 }
 
 INSTANTIATE_TEST_CASE_P(Rotate, TestI420BufferRotate,
                         ::testing::Values(kVideoRotation_0,
                                           kVideoRotation_90,
                                           kVideoRotation_180,
                                           kVideoRotation_270));
 
 }  // namespace webrtc