Moving src/webrtc into src/.

In order to eliminate the WebRTC Subtree mirror in Chromium, 
WebRTC is moving the content of the src/webrtc directory up
to the src/ directory.

NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
TBR=tommi@webrtc.org

Bug: chromium:611808
Change-Id: Iac59c5b51b950f174119565bac87955a7994bc38
Reviewed-on: https://webrtc-review.googlesource.com/1560
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Henrik Kjellander <kjellander@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#19845}

rtc_tools/testing/build_apprtc.py

@@ -0,0 +1,57 @@
+#!/usr/bin/env python
+# Copyright (c) 2017 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.
+
+"""Builds the AppRTC collider using the golang toolchain.
+
+The golang toolchain is downloaded by download_apprtc.py. We use that here
+to build the AppRTC collider server.
+
+This script needs to know the path to the 'src' directory in apprtc, the
+root directory of 'go' and the output_dir.
+"""
+
+import os
+import shutil
+import subprocess
+import sys
+
+import utils
+
+
+USAGE_STR = "Usage: {} <apprtc_src_dir> <go_dir> <output_dir>"
+
+
+def main(argv):
+  if len(argv) != 4:
+    return USAGE_STR.format(argv[0])
+
+  apprtc_dir = os.path.abspath(argv[1])
+  go_root_dir = os.path.abspath(argv[2])
+  golang_workspace = os.path.abspath(argv[3])
+
+  utils.RemoveDirectory(golang_workspace)
+
+  golang_workspace_src = os.path.join(golang_workspace, 'src')
+
+  collider_dir = os.path.join(apprtc_dir, 'collider')
+  shutil.copytree(collider_dir, golang_workspace_src)
+
+  golang_binary = 'go%s' % ('.exe' if utils.GetPlatform() == 'win' else '')
+  golang_path = os.path.join(go_root_dir, 'bin', golang_binary)
+
+  golang_env = os.environ.copy()
+  golang_env['GOROOT'] = go_root_dir
+  golang_env['GOPATH'] = golang_workspace
+  collider_exec = os.path.join(golang_workspace, 'collidermain')
+  subprocess.check_call([golang_path, 'build', '-o', collider_exec,
+                         'collidermain'], env=golang_env)
+
+
+if __name__ == '__main__':
+  sys.exit(main(sys.argv))