athena: Add a ScreenPositionClient on the root-window.

Some of the code (e.g. virtual keyboard related code in RenderWidgetHostViewAura)
expects a non-null ScreenPositionClient on the root window. So install a simple
implementation of the client that provides implementation for a single display.

BUG=380215
R=oshima@chromium.org

Review URL: https://codereview.chromium.org/330973003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@278508 0039d316-1c4b-4281-b951-d872f2087c98

athena/screen/screen_manager_impl.cc

@@ -9,9 +9,11 @@
 #include "athena/screen/screen_accelerator_handler.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
+#include "ui/aura/client/screen_position_client.h"
 #include "ui/aura/client/window_tree_client.h"
 #include "ui/aura/layout_manager.h"
 #include "ui/aura/window.h"
+#include "ui/aura/window_tree_host.h"
 #include "ui/wm/core/capture_controller.h"
 
 namespace athena {
@@ -76,6 +78,42 @@ class AthenaWindowTreeClient : public aura::client::WindowTreeClient {
   DISALLOW_COPY_AND_ASSIGN(AthenaWindowTreeClient);
 };
 
+class AthenaScreenPositionClient : public aura::client::ScreenPositionClient {
+ public:
+  AthenaScreenPositionClient() {
+  }
+  virtual ~AthenaScreenPositionClient() {
+  }
+
+ private:
+  // aura::client::ScreenPositionClient:
+  virtual void ConvertPointToScreen(const aura::Window* window,
+                                    gfx::Point* point) OVERRIDE {
+    const aura::Window* root = window->GetRootWindow();
+    aura::Window::ConvertPointToTarget(window, root, point);
+  }
+
+  virtual void ConvertPointFromScreen(const aura::Window* window,
+                                      gfx::Point* point) OVERRIDE {
+    const aura::Window* root = window->GetRootWindow();
+    aura::Window::ConvertPointToTarget(root, window, point);
+  }
+
+  virtual void ConvertHostPointToScreen(aura::Window* window,
+                                        gfx::Point* point) OVERRIDE {
+    // TODO(oshima): Implement this when adding multiple display support.
+    NOTREACHED();
+  }
+
+  virtual void SetBounds(aura::Window* window,
+                         const gfx::Rect& bounds,
+                         const gfx::Display& display) OVERRIDE {
+    window->SetBounds(bounds);
+  }
+
+  DISALLOW_COPY_AND_ASSIGN(AthenaScreenPositionClient);
+};
+
 aura::Window* CreateContainerInternal(aura::Window* parent,
                                       const std::string& name) {
   aura::Window* container = new aura::Window(NULL);
@@ -108,6 +146,7 @@ class ScreenManagerImpl : public ScreenManager {
   scoped_ptr<aura::client::WindowTreeClient> window_tree_client_;
   scoped_ptr<AcceleratorHandler> accelerator_handler_;
   scoped_ptr< ::wm::ScopedCaptureClient> capture_client_;
+  scoped_ptr<aura::client::ScreenPositionClient> screen_position_client_;
 
   DISALLOW_COPY_AND_ASSIGN(ScreenManagerImpl);
 };
@@ -129,6 +168,11 @@ aura::Window* ScreenManagerImpl::CreateDefaultContainer(
   aura::Window* container = CreateContainerInternal(root_window_, name);
   window_tree_client_.reset(new AthenaWindowTreeClient(container));
   aura::client::SetWindowTreeClient(root_window_, window_tree_client_.get());
+
+  screen_position_client_.reset(new AthenaScreenPositionClient());
+  aura::client::SetScreenPositionClient(root_window_,
+                                        screen_position_client_.get());
+
   return container;
 }
 
@@ -148,6 +192,7 @@ ScreenManagerImpl::ScreenManagerImpl(aura::Window* root_window)
 }
 
 ScreenManagerImpl::~ScreenManagerImpl() {
+  aura::client::SetScreenPositionClient(root_window_, NULL);
   aura::client::SetWindowTreeClient(root_window_, NULL);
   instance = NULL;
 }