Checkout Web Page Replay in src/third_party (was chrome/tools/build/third_party).

DEPS

Index: DEPS
diff --git a/DEPS b/DEPS
index 7a887af522b26017d9df14fb143562398c6f2726..95ad10f523a48737c7f82480ea692042e13f85b9 100644
--- a/DEPS
+++ b/DEPS
@@ -334,6 +334,11 @@ deps = {
 
   "src/tools/deps2git":
     "/trunk/tools/deps2git@128331",
+
+  "src/third_party/webpagereplay":
+    (Var("googlecode_url") % "web-page-replay") + "/trunk@447",

[cmp, 2012/04/19 00:28:43]

hmm, are there other examples of a dep-within-a-dep in this file?  have you
tested this and verified it works?

i worry that there's not an example of this today, and it may throw us off in
the future if we add it now.

[cmp, 2012/04/19 00:30:09]

what i'm thinking about is that gclient sync has a -j arg which allows it to
checkout multiple deps in parallel.  if it starts processing the second dep
before the first, then that will probably get confused.  +maruel for insight.

[slamm_google, 2012/04/19 17:51:51]

I had not thought of that. There is one other case in this file:
   src/third_party/WebKit
That has various sub directories:
   src/third_party/WebKit/LayoutTests
   src/third_party/WebKit/Source
   src/third_party/WebKit/Tools/DumpRenderTree
   src/third_party/WebKit/Tools/Scripts
   src/third_party/WebKit/Tools/TestWebKitAPI

In you look in gclient_utils.py, someone has written code to handle this issue:

def safe_makedirs(tree):
  """Creates the directory in a safe manner.                                    
                                                                      
                                                                                
                                                                      
  Because multiple threads can create these directories concurently, trap the   
                                                                      
  exception and pass on.                                                        
                                                                      
  """
  count = 0
  while not os.path.exists(tree):
    count += 1
    try:
      os.makedirs(tree)
    except OSError, e:
      # 17 POSIX, 183 Windows                                                   
                                                                      
      if e.errno not in (17, 183):
        raise
      if count > 40:
        # Give up.                                                              
                                                                      
        raise

+  "src/third_party/webpagereplay/third_party/ipaddr":
+    (Var("googlecode_url") % "ipaddr") + "/trunk@244",
 }