Add switch primary display option by swapping primary root window between displays.

This has following sub-changes
- DisplayController now manages which display is primary display, instead of relying on the order in DisplayManager
- MultiDisplayManager uses display ID instead of order to
  check if a display has added/removed or its bounds has change. (which is fixes the TODO)
- Primary display always has 0,0 origin.

This also fixed a few issues that i discovered while working on this.
- RootWindowHostLinux::SetBounds causes 2 ConfigureNotify, which causes unnecessary move/resize
  event.
- mouse_cursor_event_filter and display_controller were using default_display_layout, which is wrong. It should use the layout for currently used secondary display.

BUG=146886
TEST=covered by test. On device, press alt-f4 to switch primary display.

Review URL: https://codereview.chromium.org/10905288

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@157492 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 4 insertions, 0 deletions

diff --git a/ash/screen_ash.h b/ash/screen_ash.h
index cf2f221..8d83685 100644
--- a/ash/screen_ash.h
+++ b/ash/screen_ash.h
@@ -51,6 +51,10 @@ class ASH_EXPORT ScreenAsh : public gfx::ScreenImpl {
   static gfx::Rect ConvertRectFromScreen(aura::Window* window,
                                          const gfx::Rect& rect);
 
+  // Returns a gfx::Display object for secondary display. Returns
+  // ivalid display if there is no secondary display connected.
+  static const gfx::Display& GetSecondaryDisplay();
+
  protected:
   virtual gfx::Point GetCursorScreenPoint() OVERRIDE;
   virtual gfx::NativeWindow GetWindowAtCursorScreenPoint() OVERRIDE;