This is the 1st CL to add Virtual Screen Coordinates to ash.

- Add flag to enable virtual screen coordinate system
- Changed StackingController to use the bounds to pick the matching root window when the virtual screen coordinates is enabled.
- Added Shell::GetRootWindowMatching. Updated Shell::GetRootWindowAt to use VSC when enabled.

BUG=123160
TEST=ExtendedDesktopTest.CycleWindow is changed to use virtual screen coordinate. ExtendedDesktopTest.{GetRootRootAt|GetRootWindowMatching)

Review URL: https://chromiumcodereview.appspot.com/10637007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@143770 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 4 insertions, 2 deletions

diff --git a/ui/aura/desktop/desktop_stacking_client.cc b/ui/aura/desktop/desktop_stacking_client.cc
index be705b6..76a6ac0 100644
--- a/ui/aura/desktop/desktop_stacking_client.cc
+++ b/ui/aura/desktop/desktop_stacking_client.cc
@@ -19,7 +19,8 @@ DesktopStackingClient::~DesktopStackingClient() {
   aura::client::SetStackingClient(NULL);
 }
 
-Window* DesktopStackingClient::GetDefaultParent(Window* window) {
+Window* DesktopStackingClient::GetDefaultParent(Window* window,
+                                                const gfx::Rect& bounds) {
   if (!null_parent_.get()) {
     null_parent_.reset(new aura::RootWindow(gfx::Rect(100, 100)));
     null_parent_->Init();
diff --git a/ui/aura/desktop/desktop_stacking_client.h b/ui/aura/desktop/desktop_stacking_client.h
index b9a733e..9baaab8 100644
--- a/ui/aura/desktop/desktop_stacking_client.h
+++ b/ui/aura/desktop/desktop_stacking_client.h
@@ -28,7 +28,8 @@ class AURA_EXPORT DesktopStackingClient : public client::StackingClient {
   virtual ~DesktopStackingClient();
 
   // Overridden from client::StackingClient:
-  virtual Window* GetDefaultParent(Window* window) OVERRIDE;
+  virtual Window* GetDefaultParent(Window* window,
+                                   const gfx::Rect& bounds) OVERRIDE;
 
  private:
   // Windows with NULL parents are parented to this.