Initial cut at multi-window resize code. There's still some TODOs, but

ash/wm/root_window_event_filter.cc

Index: ash/wm/root_window_event_filter.cc
diff --git a/ash/wm/root_window_event_filter.cc b/ash/wm/root_window_event_filter.cc
index 7fcaa74e6787bb8d3da6b84cb332971c2f3c639c..5fd90245461ff85454d287bde8763573a0f6aab9 100644
--- a/ash/wm/root_window_event_filter.cc
+++ b/ash/wm/root_window_event_filter.cc
@@ -19,30 +19,6 @@ namespace internal {
 
 namespace {
 
-// Returns the default cursor for a window component.
-gfx::NativeCursor CursorForWindowComponent(int window_component) {
-  switch (window_component) {
-    case HTBOTTOM:
-      return aura::kCursorSouthResize;
-    case HTBOTTOMLEFT:
-      return aura::kCursorSouthWestResize;
-    case HTBOTTOMRIGHT:
-      return aura::kCursorSouthEastResize;
-    case HTLEFT:
-      return aura::kCursorWestResize;
-    case HTRIGHT:
-      return aura::kCursorEastResize;
-    case HTTOP:
-      return aura::kCursorNorthResize;
-    case HTTOPLEFT:
-      return aura::kCursorNorthWestResize;
-    case HTTOPRIGHT:
-      return aura::kCursorNorthEastResize;
-    default:
-      return aura::kCursorNull;
-  }
-}
-
 aura::Window* FindFocusableWindowFor(aura::Window* window) {
   while (window && !window->CanFocus())
     window = window->parent();
@@ -67,6 +43,31 @@ RootWindowEventFilter::~RootWindowEventFilter() {
   // check_empty == true and will DCHECK failure if it is not empty.
 }
 
+// static
+gfx::NativeCursor RootWindowEventFilter::CursorForWindowComponent(
+    int window_component) {
+  switch (window_component) {
+    case HTBOTTOM:
+      return aura::kCursorSouthResize;
+    case HTBOTTOMLEFT:
+      return aura::kCursorSouthWestResize;
+    case HTBOTTOMRIGHT:
+      return aura::kCursorSouthEastResize;
+    case HTLEFT:
+      return aura::kCursorWestResize;
+    case HTRIGHT:
+      return aura::kCursorEastResize;
+    case HTTOP:
+      return aura::kCursorNorthResize;
+    case HTTOPLEFT:
+      return aura::kCursorNorthWestResize;
+    case HTTOPRIGHT:
+      return aura::kCursorNorthEastResize;
+    default:
+      return aura::kCursorNull;
+  }
+}
+
 void RootWindowEventFilter::LockCursor() {
   cursor_lock_count_++;
 }