Native Client side changes for debugging support: stdout/err -> postmessage.

tools/browser_tester/browsertester/browserlauncher.py

Index: tools/browser_tester/browsertester/browserlauncher.py
===================================================================
--- tools/browser_tester/browsertester/browserlauncher.py	(revision 7373)
+++ tools/browser_tester/browsertester/browserlauncher.py	(working copy)
@@ -142,17 +142,32 @@
   def SetStandardStream(self, env, var_name, redirect_file, is_output):
     if redirect_file is None:
       return
-    redirect_file = os.path.abspath(redirect_file)
+    # logic must match src/trusted/service_runtime/nacl_resource.*
+    # resource specification notation
+    is_file = (redirect_file.startswith('file:') or
+               not (redirect_file.startswith('dev:') or
+                    redirect_file.startswith('DEBUG_ONLY:dev:')))
+    if is_file:
+      if redirect_file.startswith('file:'):
+        bare_file = redirect_file[5:]
+      else:
+        bare_file = redirect_file
+      # why always abspath?  does chrome chdir or might it in the
+      # future?  this means we do not test/use the relative path case.
+      redirect_file = 'file:' + os.path.abspath(bare_file)
+    else:
+      bare_file = None  # ensure error if used without checking is_file
     env[var_name] = redirect_file
     if is_output:
       # sel_ldr appends program output to the file so we need to clear it
       # in order to get the stable result.
-      if os.path.exists(redirect_file):
-        os.remove(redirect_file)
-      parent_dir = os.path.dirname(redirect_file)
-      # parent directory may not exist.
-      if not os.path.exists(parent_dir):
-        os.makedirs(parent_dir)
+      if is_file:
+        if os.path.exists(bare_file):
+          os.remove(bare_file)
+        parent_dir = os.path.dirname(bare_file)
+        # parent directory may not exist.
+        if not os.path.exists(parent_dir):
+          os.makedirs(parent_dir)
 
   def Launch(self, cmd, env):
     browser_path = cmd[0]