Centralizes snap sizing and implements spec'd behavior. Three resize

ash/wm/workspace/frame_maximize_button.h

Index: ash/wm/workspace/frame_maximize_button.h
diff --git a/ash/wm/workspace/frame_maximize_button.h b/ash/wm/workspace/frame_maximize_button.h
index 7dc9ca341db5a1eed8c6b20b7f3f0be9bfef041c..1a0264b9e29f2b3f372d1098291367f22b88e5c9 100644
--- a/ash/wm/workspace/frame_maximize_button.h
+++ b/ash/wm/workspace/frame_maximize_button.h
@@ -13,6 +13,7 @@ namespace ash {
 
 namespace internal {
 class PhantomWindowController;
+class SnapSizer;
 }
 
 // Button used for the maximize control on the frame. Handles snapping logic.
@@ -52,17 +53,19 @@ class ASH_EXPORT FrameMaximizeButton : public views::ImageButton {
   void InstallEventFilter();
   void UninstallEventFilter();
 
-  // Updates |snap_type_| based on a mouse drag. The parameters are relative to
-  // the mouse pressed location.
-  void UpdateSnap(int delta_x, int delta_y);
+  // Updates |snap_type_| based on a mouse drag.
+  void UpdateSnap(const gfx::Point& location);
 
-  // Returns the type of snap based on the specified coordaintes (relative to
-  // the press location).
-  SnapType SnapTypeForDelta(int delta_x, int delta_y) const;
+  // Returns the type of snap based on the specified location.
+  SnapType SnapTypeForLocation(const gfx::Point& location) const;
 
   // Returns the bounds of the resulting window for the specified type.
   gfx::Rect BoundsForType(SnapType type) const;
 
+  // Converts location to screen coordinates and returns it. These are the
+  // coordinates used by the SnapSizer.
+  gfx::Point LocationForSnapSizer(const gfx::Point& location) const;
+
   // Snaps the window to the current snap position.
   void Snap();
 
@@ -82,6 +85,8 @@ class ASH_EXPORT FrameMaximizeButton : public views::ImageButton {
   // Current snap type.
   SnapType snap_type_;
 
+  scoped_ptr<internal::SnapSizer> snap_sizer_;
+
   scoped_ptr<EscapeEventFilter> escape_event_filter_;
 
   DISALLOW_COPY_AND_ASSIGN(FrameMaximizeButton);