Get rid of extensions dependency from content\browser.
BUG=76789
Review URL: http://codereview.chromium.org/6693054
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@80315 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/browser/extensions/extension_tab_helper.h b/chrome/browser/extensions/extension_tab_helper.h
new file mode 100644
index 0000000..5b9c60a6
--- /dev/null
+++ b/chrome/browser/extensions/extension_tab_helper.h
@@ -0,0 +1,93 @@
+// Copyright (c) 2011 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.
+
+#ifndef CHROME_BROWSER_EXTENSIONS_EXTENSOIN_TAB_HELPER_H_
+#define CHROME_BROWSER_EXTENSIONS_EXTENSOIN_TAB_HELPER_H_
+#pragma once
+
+#include "content/browser/tab_contents/tab_contents_observer.h"
+#include "chrome/browser/extensions/image_loading_tracker.h"
+#include "third_party/skia/include/core/SkBitmap.h"
+
+class Extension;
+
+// Per-tab extension helper.
+class ExtensionTabHelper : public TabContentsObserver,
+ public ImageLoadingTracker::Observer {
+ public:
+ explicit ExtensionTabHelper(TabContents* tab_contents);
+ virtual ~ExtensionTabHelper();
+
+ // Copies the internal state from another ExtensionTabHelper.
+ void CopyStateFrom(const ExtensionTabHelper& source);
+
+ // Call this after updating a page action to notify clients about the changes.
+ void PageActionStateChanged();
+
+ // App extensions ------------------------------------------------------------
+
+ // Sets the extension denoting this as an app. If |extension| is non-null this
+ // tab becomes an app-tab. TabContents does not listen for unload events for
+ // the extension. It's up to consumers of TabContents to do that.
+ //
+ // NOTE: this should only be manipulated before the tab is added to a browser.
+ // TODO(sky): resolve if this is the right way to identify an app tab. If it
+ // is, than this should be passed in the constructor.
+ void SetExtensionApp(const Extension* extension);
+
+ // Convenience for setting the app extension by id. This does nothing if
+ // |extension_app_id| is empty, or an extension can't be found given the
+ // specified id.
+ void SetExtensionAppById(const std::string& extension_app_id);
+
+ const Extension* extension_app() const { return extension_app_; }
+ bool is_app() const { return extension_app_ != NULL; }
+
+ // If an app extension has been explicitly set for this TabContents its icon
+ // is returned.
+ //
+ // NOTE: the returned icon is larger than 16x16 (its size is
+ // Extension::EXTENSION_ICON_SMALLISH).
+ SkBitmap* GetExtensionAppIcon();
+
+ TabContents* tab_contents() const {
+ return TabContentsObserver::tab_contents();
+ }
+
+ private:
+ // TabContentsObserver overrides.
+ virtual void DidNavigateMainFramePostCommit(
+ const NavigationController::LoadCommittedDetails& details,
+ const ViewHostMsg_FrameNavigate_Params& params) OVERRIDE;
+ virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
+
+ // App extensions related methods:
+
+ // Resets app_icon_ and if |extension| is non-null creates a new
+ // ImageLoadingTracker to load the extension's image.
+ void UpdateExtensionAppIcon(const Extension* extension);
+
+ // ImageLoadingTracker::Observer.
+ virtual void OnImageLoaded(SkBitmap* image, const ExtensionResource& resource,
+ int index);
+
+ // Message handlers.
+ void OnPostMessage(int port_id, const std::string& message);
+
+ // Data for app extensions ---------------------------------------------------
+
+ // If non-null this tab is an app tab and this is the extension the tab was
+ // created for.
+ const Extension* extension_app_;
+
+ // Icon for extension_app_ (if non-null) or extension_for_current_page_.
+ SkBitmap extension_app_icon_;
+
+ // Used for loading extension_app_icon_.
+ scoped_ptr<ImageLoadingTracker> extension_app_image_loader_;
+
+ DISALLOW_COPY_AND_ASSIGN(ExtensionTabHelper);
+};
+
+#endif // CHROME_BROWSER_EXTENSIONS_EXTENSOIN_TAB_HELPER_H_
