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

tools/telemetry/telemetry/browser_backend.py

Index: tools/telemetry/telemetry/browser_backend.py
diff --git a/tools/telemetry/telemetry/browser_backend.py b/tools/telemetry/telemetry/browser_backend.py
index 57c4f93dd6716119a960447b6c9f23a4c2b1d47d..01257f5497dda8806df877b3120d3993092e222f 100644
--- a/tools/telemetry/telemetry/browser_backend.py
+++ b/tools/telemetry/telemetry/browser_backend.py
@@ -11,6 +11,7 @@ import sys
 import weakref
 
 from telemetry import browser_gone_exception
+from telemetry import extension_page
 from telemetry import tab
 from telemetry import tracing_backend
 from telemetry import user_agent
@@ -23,26 +24,19 @@ class BrowserConnectionGoneException(
     browser_gone_exception.BrowserGoneException):
   pass
 
-
-class TabController(object):
+class ContextControler(object):
   def __init__(self, browser, browser_backend):
     self._browser = browser
     self._browser_backend = browser_backend
-
     # Stores web socket debugger URLs in iteration order.
-    self._tab_list = []
+    self._context_list = []
     # Maps debugger URLs to Tab objects.
-    self._tab_dict = weakref.WeakValueDictionary()
-
-    self._UpdateTabList()
-
-  def New(self, timeout=None):
-    self._browser_backend.Request('new', timeout=timeout)
-    return self[-1]
+    self._context_dict = weakref.WeakValueDictionary()
+    self._UpdateContextList()
 
   def DoesDebuggerUrlExist(self, url):
-    self._UpdateTabList()
-    return url in self._tab_list
+    self._UpdateContextList()
+    return url in self._context_list
 
   def CloseTab(self, debugger_url, timeout=None):
     # TODO(dtu): crbug.com/160946, allow closing the last tab on some platforms.
@@ -81,52 +75,118 @@ class TabController(object):
     return tab_info['url']
 
   def __iter__(self):
-    self._UpdateTabList()
-    return self._tab_list.__iter__()
+    self._UpdateContextList()
+    return self._context_list.__iter__()
 
   def __len__(self):
-    self._UpdateTabList()
-    return len(self._tab_list)
+    self._UpdateContextList()
+    return len(self._context_list)
 
   def __getitem__(self, index):
-    self._UpdateTabList()
+    self._UpdateContextList()
     # This dereference will propagate IndexErrors.
-    debugger_url = self._tab_list[index]
+    debugger_url = self._context_list[index]
+    return self._GetContextObjectForDebugger(debugger_url)
+
+  def FindByUrl(self, url):
+    for tab_info in self._ListContexts():
+      if tab_info['url'] == url:
+        return self._GetContextObjectForDebugger(
+            tab_info.get('webSocketDebuggerUrl'))
+    return None
+
+  def GetAllForUrl(self, url):
+    return [self._GetContextObjectForDebugger(
+                tab_info.get('webSocketDebuggerUrl'))
+            for tab_info in self._ListContexts()
+            if tab_info['url'] == url]
+
+  def _GetContextObjectForDebugger(self, debugger_url):
     # Lazily get/create a Tab object.
-    tab_object = self._tab_dict.get(debugger_url)
+    tab_object = self._context_dict.get(debugger_url)
     if not tab_object:
-      tab_object = tab.Tab(self._browser, self, debugger_url)
-      self._tab_dict[debugger_url] = tab_object
+      tab_object = self._CreateContextObject(debugger_url)
+      self._context_dict[debugger_url] = tab_object
     return tab_object
 
-  def _ListTabs(self, timeout=None):
+  def _ListContexts(self, timeout=None):
     try:
       data = self._browser_backend.Request('', timeout=timeout)
       all_contexts = json.loads(data)
-      tabs = [ctx for ctx in all_contexts
-              if not ctx['url'].startswith('chrome-extension://')]
-      return tabs
+      contexts = self._FilterContexts(all_contexts)
+      return contexts
     except (socket.error, httplib.BadStatusLine, urllib2.URLError):
       if not self._browser_backend.IsBrowserRunning():
         raise browser_gone_exception.BrowserGoneException()
       raise BrowserConnectionGoneException()
 
-  def _UpdateTabList(self):
+  def _UpdateContextList(self):
     def GetDebuggerUrl(tab_info):
       if 'webSocketDebuggerUrl' not in tab_info:
         return None
       return tab_info['webSocketDebuggerUrl']
-    new_tab_list = map(GetDebuggerUrl, self._ListTabs())
-    self._tab_list = [t for t in self._tab_list if t in new_tab_list]
-    self._tab_list += [t for t in new_tab_list if t not in self._tab_list]
-
-  def _FindTabInfo(self, debugger_url):
-    for tab_info in self._ListTabs():
+    new_context_list = map(GetDebuggerUrl, self._ListContexts())
+    self._context_list = [t for t in self._context_list
+                          if t in new_context_list]
+    self._context_list += [t for t in new_context_list
+                           if t not in self._context_list]
+
+  def _FindContextInfo(self, debugger_url):
+    for tab_info in self._ListContexts():
       if tab_info.get('webSocketDebuggerUrl') == debugger_url:
         return tab_info
     return None
 
 
+class TabController(ContextControler):
+  def __init__(self, browser, browser_backend):
+    super(TabController, self).__init__(browser, browser_backend)
+
+  def _CreateContextObject(self, debugger_url):
+    return tab.Tab(self._browser, self, debugger_url)
+
+  def _FilterContexts(self, all_contexts):
+    return [ctx for ctx in all_contexts
+            if not ctx['url'].startswith('chrome-extension://')]
+
+  def New(self, timeout=None):
+    self._browser_backend.Request('new', timeout=timeout)
+    return self[-1]
+
+  def CloseTab(self, debugger_url, timeout=None):
+    # TODO(dtu): crbug.com/160946, allow closing the last tab on some platforms.
+    # For now, just create a new tab before closing the last tab.
+    if len(self) <= 1:
+      self.New()
+
+    tab_id = debugger_url.split('/')[-1]
+    try:
+      response = self._browser_backend.Request('close/%s' % tab_id,
+                                               timeout=timeout)
+    except urllib2.HTTPError:
+      raise Exception('Unable to close tab, tab id not found: %s' % tab_id)
+    assert response == 'Target is closing'
+
+    util.WaitFor(lambda: not self._FindContextInfo(debugger_url), timeout=5)
+    self._UpdateContextList()
+
+  def GetTabUrl(self, debugger_url):
+    tab_info = self._FindContextInfo(debugger_url)
+    assert tab_info is not None
+    return tab_info['url']
+
+class ExtensionController(ContextControler):
+  def __init__(self, browser, browser_backend):
+    super(ExtensionController, self).__init__(browser, browser_backend)
+
+  def _CreateContextObject(self, debugger_url):
+    return extension_page.ExtensionPage(
+        tab.Tab(self._browser, self, debugger_url))
+
+  def _FilterContexts(self, all_contexts):
+    return [ctx for ctx in all_contexts
+            if ctx['url'].startswith('chrome-extension://')]
+
 class BrowserBackend(object):
   """A base class for browser backends. Provides basic functionality
   once a remote-debugger port has been established."""
@@ -137,6 +197,7 @@ class BrowserBackend(object):
 
   def __init__(self, is_content_shell, options):
     self.tabs = None
+    self.extensions = None
     self.browser_type = options.browser_type
     self.is_content_shell = is_content_shell
     self.options = options
@@ -155,6 +216,8 @@ class BrowserBackend(object):
 
   def SetBrowser(self, browser):
     self.tabs = TabController(browser, self)
+    if not self.is_content_shell:
+      self.extensions = ExtensionController(browser, self)
 
   def GetBrowserStartupArgs(self):
     args = []