Import WebRTC headers from WebRTC framework.

WebRTC headers are imported from libwebrtc source code during SDK
development. They need to be replaced with WebRTC framework paths, so
apps can find these headers correctly.

Author: jianjunz

scripts/build.py

@@ -20,10 +20,14 @@
 import re
 import distutils.dir_util
 
+HOME_PATH = os.path.abspath(os.path.join(os.path.dirname(__file__), ".."))
+
 sys.path.append(os.path.join(os.path.dirname(os.path.dirname(__file__)),'build','config','mac'))
+sys.path.append(os.path.join(HOME_PATH, 'third_party', 'webrtc','tools_webrtc','apple'))
 import sdk_info
+import copy_framework_header
+
 
-HOME_PATH = os.path.abspath(os.path.join(os.path.dirname(__file__), ".."))
 OUT_PATH = os.path.join(HOME_PATH, 'out')
 # The lib contains all target architectures and external libs(OpenSSL).
 OUT_LIB_NAME = 'libowt.a'
@@ -79,7 +83,11 @@ def ninjabuild(arch, scheme, targets):
 def copyheaders(headers_target_folder):
   if os.path.exists(headers_target_folder):
     shutil.rmtree(headers_target_folder)
-  shutil.copytree(HEADER_PATH, headers_target_folder)
+    os.mkdir(headers_target_folder)
+  for _, _, file_names in os.walk(HEADER_PATH):
+    for file_name in file_names:
+      copy_framework_header.process(os.path.join(
+          HEADER_PATH, file_name), os.path.join(headers_target_folder, file_name))
 
 def getexternalliblist(ssl_root):
   libs = []