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}
diff --git a/webrtc/modules/video_coding/test/tester_main.cc b/webrtc/modules/video_coding/test/tester_main.cc
new file mode 100644
index 0000000..0184ff1
--- /dev/null
+++ b/webrtc/modules/video_coding/test/tester_main.cc
@@ -0,0 +1,75 @@
+/*
+ *  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.
+ */
+
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "gflags/gflags.h"
+#include "webrtc/modules/video_coding/include/video_coding.h"
+#include "webrtc/modules/video_coding/test/receiver_tests.h"
+#include "webrtc/test/testsupport/fileutils.h"
+
+DEFINE_string(codec, "VP8", "Codec to use (VP8 or I420).");
+DEFINE_int32(width, 352, "Width in pixels of the frames in the input file.");
+DEFINE_int32(height, 288, "Height in pixels of the frames in the input file.");
+DEFINE_int32(rtt, 0, "RTT (round-trip time), in milliseconds.");
+DEFINE_string(input_filename, webrtc::test::ProjectRootPath() +
+              "/resources/foreman_cif.yuv", "Input file.");
+DEFINE_string(output_filename, webrtc::test::OutputPath() +
+              "video_coding_test_output_352x288.yuv", "Output file.");
+
+using namespace webrtc;
+
+/*
+ * Build with EVENT_DEBUG defined
+ * to build the tests with simulated events.
+ */
+
+int vcmMacrosTests = 0;
+int vcmMacrosErrors = 0;
+
+int ParseArguments(CmdArgs& args) {
+  args.width = FLAGS_width;
+  args.height = FLAGS_height;
+  if (args.width < 1 || args.height < 1) {
+    return -1;
+  }
+  args.codecName = FLAGS_codec;
+  if (args.codecName == "VP8") {
+    args.codecType = kVideoCodecVP8;
+  } else if (args.codecName == "VP9") {
+    args.codecType = kVideoCodecVP9;
+  } else if (args.codecName == "I420") {
+    args.codecType = kVideoCodecI420;
+  } else {
+    printf("Invalid codec: %s\n", args.codecName.c_str());
+    return -1;
+  }
+  args.inputFile = FLAGS_input_filename;
+  args.outputFile = FLAGS_output_filename;
+  args.rtt = FLAGS_rtt;
+  return 0;
+}
+
+int main(int argc, char **argv) {
+  // Initialize WebRTC fileutils.h so paths to resources can be resolved.
+  webrtc::test::SetExecutablePath(argv[0]);
+  google::ParseCommandLineFlags(&argc, &argv, true);
+
+  CmdArgs args;
+  if (ParseArguments(args) != 0) {
+    printf("Unable to parse input arguments\n");
+    return -1;
+  }
+
+  printf("Running video coding tests...\n");
+  return RtpPlay(args);
+}