Wires up immersive mode for chrome and mash

ash/mus/frame/custom_frame_view_mus.cc

Index: ash/mus/frame/custom_frame_view_mus.cc
diff --git a/ash/mus/frame/custom_frame_view_mus.cc b/ash/mus/frame/custom_frame_view_mus.cc
new file mode 100644
index 0000000000000000000000000000000000000000..37bc60c24bed1544ccd4c2a6e89c7936bbfc159c
--- /dev/null
+++ b/ash/mus/frame/custom_frame_view_mus.cc
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+// Copyright 2016 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 "ash/mus/frame/custom_frame_view_mus.h"
+
+#include "ui/compositor/paint_cache.h"
+#include "ui/compositor/paint_recorder.h"
+#include "ui/gfx/canvas.h"
+
+namespace ash {
+namespace mus {
+
+CustomFrameViewMus::CustomFrameViewMus(
+    views::Widget* widget,
+    ImmersiveFullscreenControllerDelegate* immersive_delegate,
+    bool enable_immersive)
+    : CustomFrameViewAsh(widget, immersive_delegate, enable_immersive) {}
+
+CustomFrameViewMus::~CustomFrameViewMus() {}
+
+void CustomFrameViewMus::OnPaint(gfx::Canvas* canvas) {
+  canvas->Save();
+  CustomFrameViewAsh::OnPaint(canvas);
+  canvas->Restore();
+
+  // The client app draws the client area. Make ours totally transparent so
+  // we only see the client app's client area.
+  canvas->FillRect(GetBoundsForClientView(), SK_ColorBLACK,
+                   SkXfermode::kClear_Mode);
+}
+
+void CustomFrameViewMus::PaintChildren(const ui::PaintContext& context) {
+  CustomFrameViewAsh::PaintChildren(context);
+  // The client app draws the client area. Make ours totally transparent so
+  // we only see the client apps client area.
+  ui::PaintRecorder recorder(context, size(), &paint_cache_);
+  recorder.canvas()->FillRect(GetBoundsForClientView(), SK_ColorBLACK,
+                              SkXfermode::kClear_Mode);
+}
+
+}  // namespace mus
+}  // namespace ash