Transparent apps support

chrome/browser/extensions/api/app_window/app_window_api.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/browser/extensions/api/app_window/app_window_api.h"
 
 #include "base/command_line.h"
 #include "base/time.h"
 #include "base/values.h"
 #include "chrome/browser/extensions/window_controller.h"
@@ skipping 76 matching lines @@
               switches::kEnableExperimentalExtensionApis)) {
         create_params.frame = ShellWindow::CreateParams::FRAME_NONE;
         inject_html_titlebar = true;
       } else if (*options->frame == kNoneFrameOption) {
         create_params.frame = ShellWindow::CreateParams::FRAME_NONE;
       } else {
         create_params.frame = ShellWindow::CreateParams::FRAME_CHROME;
       }
     }
 
+    if (options->transparent_background.get() &&
+        CommandLine::ForCurrentProcess()->HasSwitch(

[Mihai Parparita -not on Chrome, 2012/09/28 19:15:34]

This should check if the extension has the "experimental" permission instead
(the HTML frame option probably should too).

[Bernie, 2012/10/01 18:47:24]

Ok. Could you point me at any existing code to perform this check?

[Mihai Parparita -not on Chrome, 2012/10/01 20:04:58]

Something like:
http://code.google.com/searchframe#OAMlx_jo-ck/src/chrome/browser/extensions/...

[Bernie, 2012/10/10 21:05:01]

Done.

+            switches::kEnableExperimentalExtensionApis)) {
+      create_params.transparent_background = *options->transparent_background;
+    }
+
     gfx::Size& minimum_size = create_params.minimum_size;
     if (options->min_width.get())
       minimum_size.set_width(*options->min_width);
     if (options->min_height.get())
       minimum_size.set_height(*options->min_height);
     gfx::Size& maximum_size = create_params.maximum_size;
     if (options->max_width.get())
       maximum_size.set_width(*options->max_width);
     if (options->max_height.get())
       maximum_size.set_height(*options->max_height);
@@ skipping 26 matching lines @@
   base::DictionaryValue* result = new base::DictionaryValue;
   result->Set("viewId", base::Value::CreateIntegerValue(view_id));
   result->Set("injectTitlebar",
       base::Value::CreateBooleanValue(inject_html_titlebar));
   result->Set("id", base::Value::CreateStringValue(shell_window->window_key()));
   SetResult(result);
   return true;
 }
 
 }  // namespace extensions