Finally rip the global StackingClient bandaid off.

- Removes the aura::client::SetStackingClient(StackingClient*) interface.
- Moves the ash StackingController from a singleton owned by ash::Shell to one StackingController per RootWindow owned by the ash::RootWindowController. (Also removes a spurious delegate method, where every implementation creates the same object, including tests.)
- Removes the global DesktopStackingClient and related interfaces.
- Fix the ChromeViewsDelegate so that it still sets context in chromeos builds.
- Rename content::ShellStackingClientAsh to content::MinimalAsh to reflect what it really does.

In addition, the following fix ups apply:

- Previously, WebContentsViewAura asserted that it needed a context window. Now if no context window is provided, it isn't added to an aura hierarchy. There are times when that context doesn't exist: various chromeos dialogs that directly invoke WebView and toplevel extension/app windows that are created from background pages that don't have contexts.
- Because of that, added a few of NULL checking to RenderWidgetHostViewAura. (Other methods NULL checked Window::GetRootWindow(), but there were a few that didn't and relied on the old NULL means lookup in the StackingClient behaviour.)

BUG=161882

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=177182

Review URL: https://codereview.chromium.org/11829040

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@178083 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 66 insertions, 0 deletions

diff --git a/content/shell/minimal_ash.h b/content/shell/minimal_ash.h
new file mode 100644
index 0000000..f3ec43b
--- /dev/null
+++ b/content/shell/minimal_ash.h
@@ -0,0 +1,66 @@
+// 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.
+
+#ifndef CONTENT_SHELL_MINIMAL_ASH_H_
+#define CONTENT_SHELL_MINIMAL_ASH_H_
+
+#include "base/compiler_specific.h"
+#include "base/memory/scoped_ptr.h"
+#include "ui/aura/client/stacking_client.h"
+
+namespace aura {
+class RootWindow;
+class Window;
+namespace client {
+class DefaultCaptureClient;
+class FocusClient;
+}
+namespace test {
+class TestActivationClient;
+}
+}
+
+namespace gfx {
+class Rect;
+}
+
+namespace views {
+namespace corewm {
+class CompoundEventFilter;
+class InputMethodEventFilter;
+}
+}
+
+namespace content {
+
+// Creates a minimal environment for running the shell. We can't pull in all of
+// ash here, but we can create attach several of the same things we'd find in
+// the ash parts of the code.
+class MinimalAsh : public aura::client::StackingClient {
+ public:
+  MinimalAsh();
+  virtual ~MinimalAsh();
+
+  // Overridden from client::StackingClient:
+  virtual aura::Window* GetDefaultParent(aura::Window* context,
+                                         aura::Window* window,
+                                         const gfx::Rect& bounds) OVERRIDE;
+
+ private:
+  scoped_ptr<aura::RootWindow> root_window_;
+
+  // Owned by RootWindow
+  views::corewm::CompoundEventFilter* root_window_event_filter_;
+
+  scoped_ptr<aura::client::DefaultCaptureClient> capture_client_;
+  scoped_ptr<views::corewm::InputMethodEventFilter> input_method_filter_;
+  scoped_ptr<aura::test::TestActivationClient> test_activation_client_;
+  scoped_ptr<aura::client::FocusClient> focus_client_;
+
+  DISALLOW_COPY_AND_ASSIGN(MinimalAsh);
+};
+
+}  // namespace content;
+
+#endif  // CONTENT_SHELL_MINIMAL_ASH_H_