modules/video_coding refactorings

The main purpose was the interface-> include rename, but other files
were also moved, eliminating the "main" dir.

To avoid breaking downstream, the "interface" directories were copied
into a new "video_coding/include" dir. The old headers got pragma
warnings added about deprecation (a very short deprecation since I plan
to remove them as soon downstream is updated).

Other files also moved:
video_coding/main/source -> video_coding
video_coding/main/test -> video_coding/test

BUG=webrtc:5095
TESTED=Passing compile-trybots with --clobber flag:
git cl try --clobber --bot=win_compile_rel --bot=linux_compile_rel --bot=android_compile_rel --bot=mac_compile_rel --bot=ios_rel --bot=linux_gn_rel --bot=win_x64_gn_rel --bot=mac_x64_gn_rel --bot=android_gn_rel -m tryserver.webrtc

R=stefan@webrtc.org, tommi@webrtc.org

Review URL: https://codereview.webrtc.org/1417283007 .

Cr-Commit-Position: refs/heads/master@{#10694}

webrtc/modules/video_coding/packet.h

@@ -0,0 +1,59 @@
+/*
+ *  Copyright (c) 2011 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.
+ */
+
+#ifndef WEBRTC_MODULES_VIDEO_CODING_PACKET_H_
+#define WEBRTC_MODULES_VIDEO_CODING_PACKET_H_
+
+#include "webrtc/modules/include/module_common_types.h"
+#include "webrtc/modules/video_coding/jitter_buffer_common.h"
+#include "webrtc/typedefs.h"
+
+namespace webrtc {
+
+class VCMPacket {
+public:
+    VCMPacket();
+    VCMPacket(const uint8_t* ptr,
+              const size_t size,
+              const WebRtcRTPHeader& rtpHeader);
+    VCMPacket(const uint8_t* ptr,
+              size_t size,
+              uint16_t seqNum,
+              uint32_t timestamp,
+              bool markerBit);
+
+    void Reset();
+
+    uint8_t           payloadType;
+    uint32_t          timestamp;
+    // NTP time of the capture time in local timebase in milliseconds.
+    int64_t ntp_time_ms_;
+    uint16_t          seqNum;
+    const uint8_t*    dataPtr;
+    size_t          sizeBytes;
+    bool                    markerBit;
+
+    FrameType               frameType;
+    VideoCodecType          codec;
+
+    bool isFirstPacket;                 // Is this first packet in a frame.
+    VCMNaluCompleteness completeNALU;   // Default is kNaluIncomplete.
+    bool insertStartCode;               // True if a start code should be inserted before this
+                                        // packet.
+    int width;
+    int height;
+    RTPVideoHeader codecSpecificHeader;
+
+protected:
+    void CopyCodecSpecifics(const RTPVideoHeader& videoHeader);
+};
+
+}  // namespace webrtc
+#endif // WEBRTC_MODULES_VIDEO_CODING_PACKET_H_