Pass down the opener tab when a message channel is opened to an extension.

Also did a bunch of cleanup of ExtensionMessageService.  I converted it to
primarily UI-thread habitation, with one function that needs to be on the IO
thread so it can handle a synchronous IPC message.

TEST=N/A
Review URL: http://codereview.chromium.org/99261

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@15097 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 23 insertions, 0 deletions

diff --git a/chrome/renderer/extensions/bindings_utils.cc b/chrome/renderer/extensions/bindings_utils.cc
new file mode 100644
index 0000000..ee4688d
--- /dev/null
+++ b/chrome/renderer/extensions/bindings_utils.cc
@@ -0,0 +1,23 @@
+// Copyright (c) 2009 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/bindings_utils.h"
+
+#include "chrome/renderer/render_view.h"
+#include "webkit/glue/webframe.h"
+
+RenderView* GetActiveRenderView() {
+  WebFrame* webframe = WebFrame::RetrieveActiveFrame();
+  DCHECK(webframe) << "GetActiveRenderView called when not in a V8 context.";
+  if (!webframe)
+    return NULL;
+
+  WebView* webview = webframe->GetView();
+  if (!webview)
+    return NULL;  // can happen during closing
+
+  RenderView* renderview = static_cast<RenderView*>(webview->GetDelegate());
+  DCHECK(renderview) << "Encountered a WebView without a WebViewDelegate";
+  return renderview;
+}