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/internal_defines.h

@@ -0,0 +1,68 @@
+/*
+ *  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_INTERNAL_DEFINES_H_
+#define WEBRTC_MODULES_VIDEO_CODING_INTERNAL_DEFINES_H_
+
+#include "webrtc/typedefs.h"
+
+namespace webrtc
+{
+
+#define MASK_32_BITS(x) (0xFFFFFFFF & (x))
+
+inline uint32_t MaskWord64ToUWord32(int64_t w64)
+{
+    return static_cast<uint32_t>(MASK_32_BITS(w64));
+}
+
+#define VCM_MAX(a, b) (((a) > (b)) ? (a) : (b))
+#define VCM_MIN(a, b) (((a) < (b)) ? (a) : (b))
+
+#define VCM_DEFAULT_CODEC_WIDTH 352
+#define VCM_DEFAULT_CODEC_HEIGHT 288
+#define VCM_DEFAULT_FRAME_RATE 30
+#define VCM_MIN_BITRATE 30
+#define VCM_FLUSH_INDICATOR 4
+
+// Helper macros for creating the static codec list
+#define VCM_NO_CODEC_IDX -1
+#ifdef VIDEOCODEC_VP8
+  #define VCM_VP8_IDX (VCM_NO_CODEC_IDX + 1)
+#else
+  #define VCM_VP8_IDX VCM_NO_CODEC_IDX
+#endif
+#ifdef VIDEOCODEC_VP9
+  #define VCM_VP9_IDX (VCM_VP8_IDX + 1)
+#else
+  #define VCM_VP9_IDX VCM_VP8_IDX
+#endif
+#ifdef VIDEOCODEC_H264
+  #define VCM_H264_IDX (VCM_VP9_IDX + 1)
+#else
+  #define VCM_H264_IDX VCM_VP9_IDX
+#endif
+#ifdef VIDEOCODEC_I420
+  #define VCM_I420_IDX (VCM_H264_IDX + 1)
+#else
+  #define VCM_I420_IDX VCM_H264_IDX
+#endif
+#define VCM_NUM_VIDEO_CODECS_AVAILABLE (VCM_I420_IDX + 1)
+
+#define VCM_NO_RECEIVER_ID 0
+
+inline int32_t VCMId(const int32_t vcmId, const int32_t receiverId = 0)
+{
+    return static_cast<int32_t>((vcmId << 16) + receiverId);
+}
+
+}  // namespace webrtc
+
+#endif // WEBRTC_MODULES_VIDEO_CODING_INTERNAL_DEFINES_H_