Take 2 at implementing activeTab.

chrome/renderer/extensions/extension_helper.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/renderer/extensions/extension_helper.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/json/json_string_value_serializer.h"
@@ skipping 126 matching lines @@
   return accumulator.views()[0];
 }
 
 ExtensionHelper::ExtensionHelper(content::RenderView* render_view,
                                  ExtensionDispatcher* extension_dispatcher)
     : content::RenderViewObserver(render_view),
       content::RenderViewObserverTracker<ExtensionHelper>(render_view),
       extension_dispatcher_(extension_dispatcher),
       pending_app_icon_requests_(0),
       view_type_(chrome::VIEW_TYPE_INVALID),
+      tab_id_(-1),
       browser_window_id_(-1) {
 }
 
 ExtensionHelper::~ExtensionHelper() {
 }
 
 bool ExtensionHelper::InstallWebApplicationUsingDefinitionFile(
     WebFrame* frame, string16* error) {
   // There is an issue of drive-by installs with the below implementation. A web
   // site could force a user to install an app by timing the dialog to come up
@@ skipping 45 matching lines @@
   IPC_BEGIN_MESSAGE_MAP(ExtensionHelper, message)
     IPC_MESSAGE_HANDLER(ExtensionMsg_Response, OnExtensionResponse)
     IPC_MESSAGE_HANDLER(ExtensionMsg_MessageInvoke, OnExtensionMessageInvoke)
     IPC_MESSAGE_HANDLER(ExtensionMsg_DispatchOnConnect,
                         OnExtensionDispatchOnConnect)
     IPC_MESSAGE_HANDLER(ExtensionMsg_DeliverMessage, OnExtensionDeliverMessage)
     IPC_MESSAGE_HANDLER(ExtensionMsg_DispatchOnDisconnect,
                         OnExtensionDispatchOnDisconnect)
     IPC_MESSAGE_HANDLER(ExtensionMsg_ExecuteCode, OnExecuteCode)
     IPC_MESSAGE_HANDLER(ExtensionMsg_GetApplicationInfo, OnGetApplicationInfo)
+    IPC_MESSAGE_HANDLER(ExtensionMsg_SetTabId, OnSetTabId)
     IPC_MESSAGE_HANDLER(ExtensionMsg_UpdateBrowserWindowId,
                         OnUpdateBrowserWindowId)
     IPC_MESSAGE_HANDLER(ExtensionMsg_NotifyRenderViewType,
                         OnNotifyRendererViewType)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
 }
 
 void ExtensionHelper::DidFinishDocumentLoad(WebFrame* frame) {
@@ skipping 144 matching lines @@
   }
 
   Send(new ExtensionHostMsg_DidGetApplicationInfo(
       routing_id(), page_id, app_info));
 }
 
 void ExtensionHelper::OnNotifyRendererViewType(chrome::ViewType type) {
   view_type_ = type;
 }
 
+void ExtensionHelper::OnSetTabId(int init_tab_id) {
+  CHECK_EQ(tab_id_, -1);
+  CHECK_GE(init_tab_id, 0);
+  tab_id_ = init_tab_id;
+}
+
 void ExtensionHelper::OnUpdateBrowserWindowId(int window_id) {
   browser_window_id_ = window_id;
 }
 
 void ExtensionHelper::DidDownloadApplicationDefinition(
     const WebKit::WebURLResponse& response,
     const std::string& data) {
   scoped_ptr<WebApplicationInfo> app_info(
       pending_app_info_.release());
 
@@ skipping 83 matching lines @@
       routing_id(), *pending_app_info_));
   pending_app_info_.reset(NULL);
 }
 
 void ExtensionHelper::AddErrorToRootConsole(const string16& message) {
   if (render_view()->GetWebView() && render_view()->GetWebView()->mainFrame()) {
     render_view()->GetWebView()->mainFrame()->addMessageToConsole(
         WebConsoleMessage(WebConsoleMessage::LevelError, message));
   }
 }