Implement hit tests/client area.

ui/views/mus/desktop_window_tree_host_mus.h

Index: ui/views/mus/desktop_window_tree_host_mus.h
diff --git a/ui/views/mus/desktop_window_tree_host_mus.h b/ui/views/mus/desktop_window_tree_host_mus.h
index 4980ac923f1f3f190724e3c862f16ac23499c869..47a1ed7e6dd6e749fc2a95ae2a05ecaf6e199f1f 100644
--- a/ui/views/mus/desktop_window_tree_host_mus.h
+++ b/ui/views/mus/desktop_window_tree_host_mus.h
@@ -11,6 +11,7 @@
 #include "base/macros.h"
 #include "ui/aura/env_observer.h"
 #include "ui/aura/mus/window_tree_host_mus.h"
+#include "ui/views/mus/mus_client_observer.h"
 #include "ui/views/mus/mus_export.h"
 #include "ui/views/widget/desktop_aura/desktop_window_tree_host.h"
 #include "ui/views/widget/widget.h"
@@ -19,6 +20,7 @@ namespace views {
 
 class VIEWS_MUS_EXPORT DesktopWindowTreeHostMus
     : public DesktopWindowTreeHost,
+      public MusClientObserver,
       public aura::WindowTreeHostMus,
       public aura::EnvObserver {
  public:
@@ -31,6 +33,9 @@ class VIEWS_MUS_EXPORT DesktopWindowTreeHostMus
  private:
   bool IsDocked() const;
 
+  void SendClientAreaToServer();
+  void SendHitTestMaskToServer();
+
   // DesktopWindowTreeHost:
   void Init(aura::Window* content_window,
             const Widget::InitParams& params) override;
@@ -77,6 +82,7 @@ class VIEWS_MUS_EXPORT DesktopWindowTreeHostMus
       Widget::MoveLoopEscapeBehavior escape_behavior) override;
   void EndMoveLoop() override;
   void SetVisibilityChangedAnimationsEnabled(bool value) override;
+  NonClientFrameView* CreateNonClientFrameView() override;
   bool ShouldUseNativeFrame() const override;
   bool ShouldWindowContentsBeTransparent() const override;
   void FrameTypeChanged() override;
@@ -91,6 +97,9 @@ class VIEWS_MUS_EXPORT DesktopWindowTreeHostMus
   bool IsTranslucentWindowOpacitySupported() const override;
   void SizeConstraintsChanged() override;
 
+  // MusClientObserver:
+  void OnWindowManagerFrameValuesChanged() override;
+
   // WindowTreeHostMus:
   void ShowImpl() override;
   void HideImpl() override;