Ash: Add resize border shadow effect

* Add ResizeShadow that uses solid-color layers to draw the resize border shadow effect.
* Add ResizeShadowController to create ResizeShadows and track bounds changes for windows.
* Wire both into ToplevelWindowEventFilter to track mouse move/enter events near (but not inside) the window frame.

BUG=118325
TEST=visual, hover mouse near window edges, drag windows

Review URL: https://chromiumcodereview.appspot.com/9677070

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@127268 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 6 insertions, 0 deletions

diff --git a/ash/shell.h b/ash/shell.h
index ff52a12..b5fc9cf 100644
--- a/ash/shell.h
+++ b/ash/shell.h
@@ -62,6 +62,7 @@ class DragDropController;
 class FocusCycler;
 class InputMethodEventFilter;
 class PartialScreenshotEventFilter;
+class ResizeShadowController;
 class RootWindowEventFilter;
 class RootWindowLayoutManager;
 class ShadowController;
@@ -208,6 +209,10 @@ class ASH_EXPORT Shell : public aura::MonitorObserver {
     initially_hide_cursor_ = hide;
   }
 
+  internal::ResizeShadowController* resize_shadow_controller() {
+    return resize_shadow_controller_.get();
+  }
+
   // Made available for tests.
   internal::ShadowController* shadow_controller() {
     return shadow_controller_.get();
@@ -261,6 +266,7 @@ class ASH_EXPORT Shell : public aura::MonitorObserver {
   scoped_ptr<internal::WindowModalityController> window_modality_controller_;
   scoped_ptr<internal::DragDropController> drag_drop_controller_;
   scoped_ptr<internal::WorkspaceController> workspace_controller_;
+  scoped_ptr<internal::ResizeShadowController> resize_shadow_controller_;
   scoped_ptr<internal::ShadowController> shadow_controller_;
   scoped_ptr<internal::TooltipController> tooltip_controller_;
   scoped_ptr<internal::VisibilityController> visibility_controller_;