[Telemetry] Implement dirty profile generation

tools/telemetry/telemetry/core/chrome/desktop_browser_backend.py

Index: tools/telemetry/telemetry/core/chrome/desktop_browser_backend.py
diff --git a/tools/telemetry/telemetry/core/chrome/desktop_browser_backend.py b/tools/telemetry/telemetry/core/chrome/desktop_browser_backend.py
index eccdb5a1edae6e1981a7fa38f597e4eb468641c4..15a70532dd9212524fac9ca0ffc6ba86b1254239 100644
--- a/tools/telemetry/telemetry/core/chrome/desktop_browser_backend.py
+++ b/tools/telemetry/telemetry/core/chrome/desktop_browser_backend.py
@@ -20,7 +20,7 @@ class DesktopBrowserBackend(chrome_browser_backend.ChromeBrowserBackend):
   Mac or Windows.
   """
   def __init__(self, options, executable, flash_path, is_content_shell,
-               browser_directory, delete_profile_dir_after_run=True):
+               browser_directory, output_profile_path=None):
     super(DesktopBrowserBackend, self).__init__(
         is_content_shell=is_content_shell,
         supports_extensions=not is_content_shell,
@@ -50,7 +50,7 @@ class DesktopBrowserBackend(chrome_browser_backend.ChromeBrowserBackend):
     self._port = util.GetAvailableLocalPort()
     self._profile_dir = None
     self._supports_net_benchmarking = True
-    self._delete_profile_dir_after_run = delete_profile_dir_after_run
+    self._output_profile_path = output_profile_path
     self._tmp_minidump_dir = tempfile.mkdtemp()
 
     self._SetupProfile()
@@ -221,8 +221,16 @@ class DesktopBrowserBackend(chrome_browser_backend.ChromeBrowserBackend):
           self._proc = None
           raise Exception('Could not shutdown the browser.')
 
-    if self._delete_profile_dir_after_run and \
-        self._tmp_profile_dir and os.path.exists(self._tmp_profile_dir):
+    # Copy profile aside if requested.
+    if self._output_profile_path:
+      if not (self._tmp_profile_dir and os.path.exists(self._tmp_profile_dir)):
+        raise Exception("No profile directory generated by Chrome: '%s'." %
+            self._tmp_profile_dir)
+      shutil.move(self._tmp_profile_dir, self._output_profile_path)
+      logging.info("Generated profile moved teporarily to '%s'." %
+          self._output_profile_path)
+
+    if self._tmp_profile_dir and os.path.exists(self._tmp_profile_dir):
       shutil.rmtree(self._tmp_profile_dir, ignore_errors=True)
       self._tmp_profile_dir = None