Proof of concept for running extension API stack through dev tools.

tools/telemetry/telemetry/desktop_browser_backend.py

Index: tools/telemetry/telemetry/desktop_browser_backend.py
diff --git a/tools/telemetry/telemetry/desktop_browser_backend.py b/tools/telemetry/telemetry/desktop_browser_backend.py
index 8afc79bee74f69fe51d16ed3278e890e2aa71a21..0affa9c200cd5157632e84e8181dcd133d738b53 100644
--- a/tools/telemetry/telemetry/desktop_browser_backend.py
+++ b/tools/telemetry/telemetry/desktop_browser_backend.py
@@ -53,6 +53,22 @@ class DesktopBrowserBackend(browser_backend.BrowserBackend):
     if not self.options.dont_override_profile:
       self._tmpdir = tempfile.mkdtemp()
       args.append('--user-data-dir=%s' % self._tmpdir)
+    extensions = ''
+    component_extensions = ''
+    for extension in self.options.extensions_to_load:
+      if extension.is_component:
+        if len(component_extensions):
+          component_extensions += ','

[nduca, 2012/12/07 19:23:47]

how about compoent_extensions and extensions being []'s and using
','.join(compoent_extensions) to comma separate them

[zel, 2012/12/12 21:03:42]

done, made it even more pythony 

+        component_extensions += extension.path
+      else:
+        if len(extensions):
+          extensions += ','
+        extensions += extension.path
+    if len(extensions) > 0:
+      args.append('--load-extension=%s' % extensions)
+    if len(component_extensions) > 0:
+      args.append('--load-component-extension=%s' % component_extensions)
+
     return args
 
   def IsBrowserRunning(self):