Add support for v3.1.0 symcache format

ETWPackSymbols.py already understood two symcache formats, so now it
understands three. It can find the new symcache files, and preserve the
directory hierarchy when copying to the destination.

The filtering of what files are "interesting" is less reliable than
ever, so adjust that line as needed.

This finishes resolving issue #131.

bin/ETWPackSymbols.py

@@ -78,6 +78,7 @@ def main():
     verbose = True
 
   print("Extracting symbols from ETL file '%s'." % ETLName)
+  print("Note that you will probably need to update the 'interesting' calculation for your purposes.")
 
   # -tle = tolerate lost events
   # -tti = tolerate time ivnersions
@@ -107,6 +108,8 @@ def main():
     # Set SymCache to the C drive if not specified.
     symCachePathBase = "c:\\symcache\\"
     print("_NT_SYMCACHE_PATH not set. Looking for symcache in %s" % symCachePathBase)
+  if symCachePathBase[-1] != '\\':
+    symCachePathBase += '\\'
 
   for row in csv.reader(lines, delimiter = ",", quotechar = '"', skipinitialspace=True):
     results = ParseRow(row)
@@ -120,25 +123,37 @@ def main():
     # are counted, which filters out many Microsoft symbols. The ideal filter
     # would return all locally built symbols - all that cannot be found on
     # symbol servers - and this gets us partway there.
-    interesting = PDBPath.count(":") > 0
+    interesting = PDBPath.count(":") > 0 or PDBPath.count("chrome") > 0
     if interesting:
       interestingModuleCount += 1
-      # WPT has two different .symcache file patterns. Neither is documented but
-      # both occur in the symcache directory.
+      # WPT has three different .symcache file patterns. None are documented but
+      # all occur in the symcache directory.
       symCachePathv1 = "%s-%08x%08xv1.symcache" % (OrigFileName, TimeDateStamp, ImageSize)
       symCachePathv2 = "%s-%s%xv2.symcache" % (OrigFileName, guid, age)
+      pdb_file = os.path.split(PDBPath)[1]
+      symCachePathv3 = r"%s\%s%s\%s-v3.1.0.symcache" % (pdb_file, guid, age, pdb_file)
       symCachePathv1 = os.path.join(symCachePathBase, symCachePathv1)
       symCachePathv2 = os.path.join(symCachePathBase, symCachePathv2)
+      symCachePathv3 = os.path.join(symCachePathBase, symCachePathv3)
       foundPath = None
       if os.path.isfile(symCachePathv1):
         foundPath = symCachePathv1
       elif os.path.isfile(symCachePathv2):
         foundPath = symCachePathv2
+      elif os.path.isfile(symCachePathv3):
+        foundPath = symCachePathv3
 
       if foundPath:
         matchExists += 1
         print("Copying %s" % foundPath)
-        shutil.copyfile(foundPath, os.path.join(DestDirName, os.path.split(foundPath)[1]))
+        dest = foundPath[len(symCachePathBase):]
+        dest_dir, dest_file = os.path.split(dest)
+        if dest_dir:
+          try:
+            os.makedirs(os.path.join(DestDirName, dest_dir))
+          except:
+            pass # Continue on exceptions, directly probably already exists.
+        shutil.copyfile(foundPath, os.path.join(DestDirName, dest_dir, dest_file))
       else:
         if verbose:
           print("Symbols for '%s' are not in %s or %s" % (OrigFileName, symCachePathv1, symCachePathv2))